CN112650827A - River basin and river coding method and device based on Strahler classification - Google Patents
River basin and river coding method and device based on Strahler classification Download PDFInfo
- Publication number
- CN112650827A CN112650827A CN202011633575.9A CN202011633575A CN112650827A CN 112650827 A CN112650827 A CN 112650827A CN 202011633575 A CN202011633575 A CN 202011633575A CN 112650827 A CN112650827 A CN 112650827A
- Authority
- CN
- China
- Prior art keywords
- river
- independent
- rivers
- basin
- grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000007781 pre-processing Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 69
- 238000012545 processing Methods 0.000 claims description 23
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000005194 fractionation Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 description 8
- 238000000605 extraction Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 108020001568 subdomains Proteins 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000009853 xinfeng Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001983 electron spin resonance imaging Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000001363 water suppression through gradient tailored excitation Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/29—Geographical information databases
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/28—Databases characterised by their database models, e.g. relational or object models
- G06F16/284—Relational databases
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F40/00—Handling natural language data
- G06F40/10—Text processing
- G06F40/12—Use of codes for handling textual entities
- G06F40/126—Character encoding
Abstract
The invention provides a river basin and river coding method and device based on Strahler classification, wherein the method comprises the following steps: preprocessing acquired DEM data, wherein the preprocessing at least comprises the following steps: treating an inner flow area, treating a yellow river and a dang river and treating a depression; analyzing the preprocessed DEM data to obtain river network data, wherein the river network data at least comprise a plurality of river basins and a plurality of rivers; grading the plurality of rivers based on a Strahler grading method; and coding the plurality of river basins and the plurality of rivers according to a preset coding strategy and through the grading of the plurality of rivers. The method solves the problems that the river data covered by the existing coding method has limited dimensionality, poor expansibility and can not comprehensively represent river topology.
Description
Technical Field
The invention relates to the technical field of coding, in particular to a river basin and river coding method and device based on Strahler classification.
Background
The digital drainage basin is important basic data of scientific research in the fields of hydrology science and application research, hydrology information management, geography, environment, ecology and the like. The digital watershed data set generated based on the digital elevation model and the GIS hydrological analysis technology generally comprises a river network, a watershed boundary, a flow direction and the like. Where the network and flow direction define the topological relationships of water circulation and other material or energy circulation accompanying the water circulation (e.g., directional relationships such as source and sink, upstream and downstream), and the watershed defines the unit or range of calculation or management based on the natural water flow process. The extracted river network and the river basin are coded delicately to bear topological structure information so as to better serve the compiling, storage and retrieval of hydrological information and cross-industry communication and application, and the method is a key problem of a digital river basin technology.
SL249-2012 promulgated Chinese river code standard which systematically, practically and uniquely codes rivers having water collection areas over 500 square kilometers or lengths over 30 kilometers, large and important medium reservoirs and water gates. The standard is mainly suitable for management and application in the fields of compilation, storage, retrieval and the like of river information of water conservancy departments, the support function of flood prevention, drought resistance and other works is emphasized in the coding principle, the coding format is mixed coding of numbers and letters, and the length is 8 bits. The coding standard is applied to the China water conservancy department, and provides an important support for the information management of flood control and drought control and water conservancy departments. The standard does not encode the medium and small river flows which account for about 50% of the total number of rivers in China, and main service objects do not contain the public and can only support cross-industry applications such as hydrological modeling, geography, environment, ecology and the like in a limited way.
Patent document CN 108804804 a discloses a method for rapidly coding a large number of sub-domains based on a digital river network, and the method adopts a fully digital coding format, can reflect the level and topological relation of a river, and has good code capacity, expandability and readability. The method can be used for coding a single independent stream domain and the sub-stream domains contained in the independent stream domain, and is convenient for inter-stream domain connection comparison in the independent stream domain. For example, the catchment area of the basin with smaller series is larger than that of the basin with larger series, and the catchment areas of the basins with the same series are basically equivalent; a confluence relationship between the small and large watersheds, and the like. However, a region may include a plurality of independent watersheds, such as the independent watersheds directly accessing the sea in china, such as the Yangtze river, the yellow river, the Zhu river, and the like. Since the encoding of CN 108804804 a always starts from 1, after it is applied to the encoding of the Yangtze river basin, no codes are available for other basins such as the yellow river. In addition, the relation between different independent basins is inconvenient to compare, and the hydrological characteristics of two basins which are just level 1 can be obviously different because the difference of water collecting areas is hundreds of times, and at the moment, the comparison between the level 1 independent basin with a smaller area and the level 3 or level 4 sub-basins of the independent basin with a larger area can be more reasonable.
The two coding methods have good application or reference value in the aspect of river and river basin coding in China, and basically meet the scientific property, uniqueness, integrity and expansibility of the coding technical requirements. However, it should be noted that, the rivers covered by the standard SL249-2012 are limited, the encoding applicability is very strong, and there is a certain limitation in the cross-industry application and communication, and in the encoding process of the patent document CN 108804804 a, the relation comparison (i.e. longitudinal comparison) between the rivers and sub-basins in the independent basins is emphasized, but the relation comparison (i.e. lateral comparison) between the rivers and sub-basins between the independent basins has a certain difficulty.
Therefore, the problems of limited river covered by the codes, poor expansibility and unclear representation of river topology caused by the conventional coding method are not solved.
Disclosure of Invention
The invention provides a river basin and river coding method and device based on Strahler classification, and aims to solve the problems that river data covered by an existing coding method is limited in dimensionality, poor in expansibility and incapable of comprehensively representing river topology.
According to a first aspect of the present invention, there is provided a method for encoding a river and a river based on Strahler classification, the method comprising: preprocessing acquired DEM data, wherein the preprocessing at least comprises the following steps: treating an inner flow area, treating a yellow river and a dang river and treating a depression; analyzing the preprocessed DEM data to obtain river network data, wherein the river network data at least comprise a plurality of river basins and a plurality of rivers; grading the plurality of rivers based on a Strahler grading method; and coding the plurality of river basins and the plurality of rivers according to a preset coding strategy and through the grading of the plurality of rivers.
Further, the watershed comprises at least an independent watershed and a sub watershed.
Further, the river network data includes a plurality of grids, wherein the step of analyzing the preprocessed DEM data to obtain the river network data includes: processing the grids through a D8 algorithm to generate the flow direction of each grid; calculating and generating the water collecting area of each grid; determining the grids meeting the preset water collecting area threshold value as river network grids; acquiring a watershed outlet in the river network grid; counting river network grids flowing into the watershed outlet; determining a water collection range corresponding to the watershed outlet according to the river network grids flowing into the watershed outlet and the flow direction of each grid; and determining the river and the river basin according to the water collection range.
Further, the step of classifying the plurality of rivers based on the Strahler classification method comprises: determining the river network grids meeting preset conditions as river source grids; obtaining at least one downstream grid of the river source grid according to the flow direction of each grid; counting the number of the grids flowing into the downstream grid; and judging the grade of the river where the downstream grid is located according to the number.
Further, the step of coding the plurality of river basins and the plurality of rivers according to a preset coding strategy and through the grading of the plurality of rivers comprises: calculating to obtain the areas of the independent drainage basins; obtaining the area ranking of each independent basin according to the areas of the independent basins; generating a code of each independent basin according to the area ranking of the independent basins and the highest ranking of rivers contained in the independent basins; generating codes of all rivers contained in the independent watershed according to the codes of the independent watershed and the grades of all the rivers contained in the independent watershed; and generating the codes of the sub-watersheds contained in the independent watersheds according to the codes of the rivers with the highest grades contained in the independent watersheds.
According to a second aspect of the present invention, there is provided an encoding apparatus based on Strahler classification, the apparatus comprising: the device comprises a preprocessing unit, a data processing unit and a data processing unit, wherein the preprocessing unit is used for preprocessing the acquired DEM data, and the preprocessing at least comprises the following steps: treating an inner flow area, treating a yellow river and a dang river and treating a depression; the analysis unit is used for analyzing the preprocessed DEM data to obtain river network data, wherein the river network data comprise a plurality of river basins and a plurality of rivers; a classifying unit for classifying the plurality of rivers based on a Strahler classifier; and the coding unit is used for coding the plurality of river areas and the plurality of rivers according to a preset coding strategy and through the grading of the plurality of rivers.
Optionally, the watershed comprises at least an independent watershed and a sub-watershed.
Optionally, the river network data includes a plurality of grids, wherein the analysis unit includes: the processing module is used for processing the grids through a D8 algorithm to generate the flow direction of each grid; calculating and generating the water collecting area of each grid; the first determining module is used for determining the grids meeting the preset water collecting area threshold value as river network grids; the first acquisition module is used for acquiring a watershed outlet in the river network grid; the first statistic module is used for counting river network grids flowing into the drainage basin outlet; the second determining module is used for determining a water collecting range corresponding to the watershed outlet according to the river network grids flowing into the watershed outlet and the flow direction of each grid; and the third determining module is used for determining the river and the river basin according to the water collecting range.
Optionally, the ranking unit comprises: the fourth determining module is used for determining the river network grid meeting the preset conditions as a river source grid; the second acquisition module is used for acquiring at least one downstream grid of the river source grid according to the flow direction of each grid; the second statistical module is used for counting the number of the grids flowing into the downstream; and the judging module is used for judging the grade of the river where the downstream grid is located according to the number.
Optionally, the encoding unit includes: the second calculation module is used for calculating and obtaining the areas of the independent drainage basins; the obtaining module is used for obtaining the area ranking of each independent basin according to the areas of the independent basins; a first generation module, configured to generate a code for each independent basin according to the area rank of the independent basin and the highest rank of the river included in the independent basin; a second generation module, configured to generate codes of all rivers included in the independent watershed according to the codes of the independent watershed and the grades of all the rivers included in the independent watershed; and the third generation module is used for generating the codes of the sub-watersheds contained in the independent watersheds according to the codes of the rivers with the highest grades contained in the independent watersheds.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram of a river basin and river coding method based on Strahler classification according to a first embodiment of the invention;
FIG. 2 is a flow chart of river and river basin extraction and encoding according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a river and river basin coding structure according to one embodiment of the present invention;
FIG. 4 is a schematic view of river coding of a sub-basin in accordance with one embodiment of the present invention;
FIG. 5 is a schematic diagram of independent stream domain coding of an independent stream domain according to an embodiment of the present invention; and
fig. 6 is a schematic diagram of an encoding apparatus based on Strahler classification according to the second embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Example one
The scheme provides a river basin and river coding method based on Strahler classification, and the scheme can be executed in a computer such as a server, and the like, as shown in FIG. 1, the method can include:
step S11, preprocessing the acquired DEM data, where the preprocessing at least includes: treating an inner flow area, treating a yellow river and a dang river and treating a depression.
Specifically, in this embodiment, the DEM data may be terrain data in a grid format (e.g., ESRI ASCII, etc.), and preferably, this embodiment uses SRTM DEM data with a horizontal resolution of 250m, and then performs a series of preprocessing operations on the data, which are not limited to the inner stream area processing, the yellow river suspended river processing, and the hollow area processing. According to the scheme, pre-processing can be carried out according to topographic data of the inflow sea basin outside China, the inland river, the inland lake basin and the downstream of the yellow river, and depression-free DEM derivative data with small change amount (about 6%) of an original DEM are generated, so that the continuity of a water flow path is ensured, and the actual situation of water flow in China is met as far as possible.
In an optional embodiment, the step S11 of preprocessing the acquired DEM data may include:
and S111, when the digital watershed is constructed, the outlets of the default independent watersheds are all positioned on a coastline or a land lake boundary, in the scheme, the independent watersheds refer to watersheds with final drainage outlets falling on the coastline, inland trunk or a lake shoreline, and in order to ensure that inland rivers can be accurately extracted, the DEM of the inland lake region is assigned to be a null value during terrain data preprocessing. For example, Yangtze river, yellow river, Zhujiang river and the like are all outflow independent watersheds, Tarim river and Qinghai lake are inflow independent watersheds, and Dongting lake, Poyang lake and Taihu lake are all sub watersheds of Yangtze river watersheds, because they finally flow into the sea through Yangtze river.
Step S112: according to topographic data, the downstream dry flow of the yellow river is digitized, the elevation height of river banks on two sides of the river is manually raised to describe the constraint effect of an artificial dam, and the downstream river section and the river basin boundary of the yellow river are reasonably extracted.
Step S113: in the depression processing process, when the original height of the adjacent grid at the upstream is larger than that of the depression grid, the height difference between the adjacent grid and the depression grid is kept unchanged before and after the depression processing, the depression processing method keeps the elevation information of the original DEM to the maximum extent on the premise of ensuring the continuity of a water flow path, is favorable for calculating the flow direction more reasonably and extracting a digital river network, and can provide the DEM with small modification amount and no depression for the hydrological study of required shape data after the depression filling process.
And step S13, analyzing the preprocessed DEM data to obtain river network data, wherein the river network data comprises a plurality of river basins and a plurality of rivers.
Specifically, in the scheme, after the DEM data is preprocessed, river network data is analyzed from the preprocessed DEM data, rivers are extracted based on the river network data, and the watersheds are divided, optionally, the watersheds may include independent watersheds and sub-watersheds contained in the independent watersheds, the independent watersheds may be final watershed places on borders or inland lakes of China, and the sub-watersheds refer to sub-watersheds further subdivided inside the independent watersheds.
Step S15, the plurality of rivers are classified based on the Strahler classification method.
Specifically, in the analysis of a plurality of rivers, the scheme may classify the plurality of rivers based on a Strahler classification method, and the Strahler classification rule may be as follows: the river (namely river source) into which no branch flows are imported is a grade 1 river; when rivers with the same level are converged, the stage number of the downstream river reach of the junction is increased by one level, and when the rivers with different levels are converged, the stage number of the downstream river reach of the junction is kept to be the highest level in the converged rivers. For example, two level-1 rivers meet, with a level-2 river downstream of the meeting point; the two 2-level rivers are converged, and the downstream of the junction is a 3-level river; the level 1 river is intersected with the level 2 river, the downstream of the intersection point is still the level 2 river, and so on.
And step S17, coding the plurality of river basins and the plurality of rivers according to a preset coding strategy and through the grading of the plurality of rivers.
Specifically, in the present embodiment, a coding rule may be defined in advance, and the river and the watersheds (the independent watersheds and the sub watersheds) may be coded according to the classification of the river obtained by the Strahler method. The encoding rule may be: the codes of all the watersheds are composed of numbers so as to pursue the simplicity of the codes, for example, all the independent watersheds arranged at 1-999 bits from large to small in water collection area in China have unique codes; the code of each independent basin is composed of 4 digits, the first 3 digits are the digits from large to small according to the water collection area in China, the value is 001-plus 999, and the 4 th digit is the highest Strahler river series contained in each independent basin, and the value is 1-9. All sub-domains contained in the coded independent domains have unique codes, and the codes of the sub-domains contain and expand the codes of the belonging upper-level domains so as to represent the topological relation of the domains; when the Strahler grade of the tributary and the sub-stream field is reduced by 1 grade, two bits are added to the coding, and the value is 00-99. The resulting code structure according to the above-mentioned preset encoding strategy is depicted in fig. 3. The first section of the code has 4-bit codes, the first 3 bits represent the highest-level river according to the water collection area level (001-. And starting from the 5 th bit of the code, when the river level in the independent river domain is reduced by one level, two bits (values are sequentially selected from 00, 02, 03, … and 99) are added on the basis of the code of the river into which the code of the corresponding river is converged, the two bits are gradually increased from 00 to 99, and the numerical value is increased from the downstream to the upstream, so that all the rivers are coded.
It should be noted that the scheme provides a Chinese river basin coding method based on the Strahler river series through the method, and the scheme can be realized by compiling a whole set of C + + programs, adopting a unified algorithm and topographic Data (DEM), extracting domestic rivers in China, dividing river basins and carrying out Strahler river grading, realizing the coding of the rivers and the river basins, and providing basic reference for promoting water conservancy information management, hydrological scientific research and hydrological information sharing and communication among industries. Therefore, the technical problems of limited river covered by the codes and poor expansibility caused by the existing coding method of the existing coding method are solved. According to the scheme, based on a traditional Strahler river grading method, hydrological features of equivalent drainage basins in independent drainage basins and between independent drainage basins in China under natural conditions are compared, unified standards and calculation programs are adopted, rivers and drainage basins in China are automatically extracted and coded, and the codes have the characteristics of simplicity, uniqueness, large code capacity, strong expandability, capability of reflecting river networks and drainage basin topological structures, support of relation comparison between rivers and drainage basins in the independent drainage basins and between the independent drainage basins and the like, and are favorable for promoting water conservancy information management, hydrological scientific research and sharing and communication of hydrological information among industries.
Optionally, the drainage basin in the scheme at least comprises an independent drainage basin and sub-drainage basins, and with reference to fig. 2, the scheme firstly performs preprocessing on topographic Data (DEM), including inflow area processing, yellow river suspension processing and depression processing; then, extracting a river network and dividing a river basin, wherein the flow direction and water collection area calculation, river extraction, river basin division and other processes are included, and then, a Strahler method is adopted to carry out river grading; secondly, making river and river basin coding rules; finally, the river and the watershed are encoded.
Optionally, the river network data includes a plurality of grids, wherein the step S13 of obtaining the river network data from the preprocessed DEM data through analysis may include:
in step S131, a plurality of grids are processed by the D8 algorithm to generate a flow for each grid.
Step S132, calculating and generating the water collecting area of each grid.
And step S133, determining the grids meeting the preset water collecting area threshold value as river network grids.
And S134, acquiring a river basin outlet in the river network grid.
Step S135, a river network grid flowing into the outlet of the drainage basin is counted.
And S136, determining a water collection range corresponding to the watershed outlet according to the river network grids flowing into the watershed outlet and the flow direction of each grid.
Step S137, a river and a river basin are determined from the catchment range.
Specifically, in the scheme, the flow direction is calculated by using a D8 algorithm, then the water collection area is calculated according to the calculation result, a reasonable water collection area threshold value can be selected for river extraction, the larger the water collection area threshold value is, the more sparse the extracted river network is, and otherwise, the denser the extracted river network is. The method comprises the steps of determining a water collecting area threshold value by controlling the proportion of the stream surface area to the water collecting area of the drainage basin, marking grids flowing into the drainage basin outlet against the water flow direction from the drainage basin outlet according to the flow direction, obtaining a drainage basin range (namely a water collecting area) corresponding to the drainage basin outlet through iterative calculation, and dividing the independent drainage basin and a plurality of sub-drainage basins in the independent drainage basin according to the drainage basin range.
In an alternative embodiment, the eight neighborhood (D8) flow direction of each grid is first calculated, the catchment area of each grid is further calculated, and then the river network is extracted by setting the grid exceeding the catchment area threshold as the river network grid, and vice versa as the hill grid. The water collection area threshold of each independent basin is different. The selection method comprises the steps of firstly estimating the percentage of the river surface area of each independent river basin to the total catchment area (a remote sensing measurement method is adopted), then setting a plurality of thresholds to respectively extract river network water systems, calculating the percentage of the corresponding river network area, and selecting the threshold closest to the estimated percentage as the optimal river extraction catchment area threshold. And finally, marking a grid which flows into the watershed outlet against the water flow direction from the watershed outlet according to the flow direction result, and demarcating a watershed water collection range corresponding to the watershed outlet through iterative computation. And vectorizing the ASCII files of the river network and the river basin boundary for the convenience of subsequent calculation and use.
Optionally, the step of step S15 classifying the plurality of rivers based on the Strahler classification method may include:
and step S151, determining the river network grid meeting the preset conditions as a river source grid.
And S152, acquiring at least one downstream grid of the river source grid according to the flow direction of each grid.
Step S153, count the number of grids flowing downstream.
And step S154, judging the grade of the river where the downstream grid is located according to the number.
In an optional embodiment, based on the extracted raster river network data, a Strahler method and a queue technology in a C + + data structure may be adopted to perform river ranking, specifically, first, all river sources are found according to the flow direction and the extracted rivers, the rank of the river source raster is assigned to 1, and the 1-level river queue is added. The river source grid satisfies two conditions: the first one belongs to river grids; secondly, there is no river grid in the adjacent grids that flows to this grid. Then, moving a grid from the river source to the downstream according to the flow direction, counting the number of the grids of the adjacent rivers flowing into the current grid, if the number is equal to 1, continuing to move to the downstream, wherein the river grade of the current grid is the same as that of the grids of the upstream rivers; if the number is more than 1, the current grid is indicated to be a river intersection, the highest level and the number of the upstream river grids are judged, if only 1 highest level exists, the river level of the current grid is equal to the highest level, if a plurality of highest levels exist, the river level of the current grid is equal to the highest level plus 1, the current grid is reserved as the 'river source' of the next-level river, and the river source is added into a 2-level river queue. Finally, repeating the process for all river sources in the level 1 river queue to obtain a level 2 river queue; repeating the process for all 'river sources' in the 2-level river queues to obtain 3-level river queues, and repeating the steps until the next-level river queue is empty, and finishing grading.
For example, using 250m resolution SRTM DEM data, about 40 million rivers were initially extracted in china, with the highest river rating being 9, where: about 31 million rivers for level 1, about 6.7 million rivers for level 2, about 1.5 million rivers for level 3, about 3300 rivers for level 4, about 800 rivers for level 5, about 200 rivers for level 6, about 50 rivers for level 7, 10 rivers for level 8, and 2 rivers for level 9. The total length of the river network extracted in China is about 240 km.
Optionally, the step S17 of coding the plurality of basins and the plurality of rivers according to a preset coding strategy and through a hierarchy of the plurality of rivers may include:
in step S171, the areas of the plurality of independent watersheds are calculated.
And step S172, obtaining the area ranking of each independent basin according to the areas of the independent basins.
Step S173 generates a code for each independent watershed according to the area rank of the independent watershed and the highest rank of the river included in the independent watershed.
In step S174, the codes of all the rivers included in the independent watershed are generated based on the codes of the independent watershed and the classifications of all the rivers included in the independent watershed.
In step S175, the code of the sub-watershed included in the independent watershed is generated from the code of the river of the highest rank included in the independent watershed.
Specifically, in step S175, the sub-stream fields included in the independent stream field are encoded. The scheme can set that the code of the sub-river basin is the same as the code of the highest-level river contained in the sub-river basin, and the code of the main stream local water collecting area adds '00' to the tail part of the corresponding main stream river code. The catchment area in the flow field can be divided into two parts, namely a sub-flow field and a main flow local catchment area. The sub-river basin is the whole water collection range of the next-level branch, and the main flow local water collection area is the local water collection range of the highest-level river in the sub-river basin.
For example, the catchment area of an 8-level independent zhuangjiang river basin is formed by splicing 5 contained 7-level branches with a local catchment area corresponding to a zhuangjiang main stream river reach (8-level), the sub-basin code where the 5 7 and branch flows are located is "0058" tail adding "01", 02 "," 03 "," 04 "," 05 ", and the code of the 8-level main stream local catchment area is" 0058 "tail adding" 00 ".
According to the defined coding rule, the code of each independent basin in China is shortest and is 4 bits; the highest independent basin grade is 9 grades (such as Yangtze river and yellow river); the longest stream field is coded as 1 level tributary contained in 9 levels of independent stream fields, and the coding length is 20 bits. Coding each independent river basin in China according to the descending order of the area, wherein, but not limited to, '0019', '0029', '0038', '0048' and '0058' respectively refer to the Yangtze river basin, the yellow river basin, the Songhua river basin, the Tarim river basin and the Zhujiang river basin. The independent basin coding mode can compare the relative sizes of independent basins according to the size of the water collecting area and the highest Strahler grade, thereby not only ensuring the relative hierarchical structure of rivers and sub-basins in the same basin, but also supporting the contrast relation of crossing independent basins. For example, when the maximum peak flow is researched, it is difficult to directly compare the river basin of the Huai river with the river basin of the Yangtze river in terms of volume, but the river basin of the Huai river is relatively reasonable in terms of volume when compared with the river basins of the Yangtze river, such as the Dongting lake of the Yangtze river, the Poyang lake or the Taihu lake.
The coding mode of the scheme can realize the following coding characteristics:
(1) the code contains catchment topological structure information of the river basin and the river. In the same independent river basin, nested codes can visually reflect the catchment topological relation of rivers and sub-river basins in the same river basin, so that the river network index relation is conveniently established, and the hydrologic modeling and hydrologic information management are served. For example, 0019 is the code of the largest independent Yangtze river basin in China, and 001902 is the Poyang lake basin, the 8-level sub-basin of the 9-level Yangtze river basin.
(2) The encoding includes hierarchical structure information based on the Strahler series of the river basin and the river. Basins or rivers of the same strathler series generally have better hydrologic contrast. The mathematical formula for calculating the number of the basin stages according to the basin coding is [ basin stage ] - [ 4 th digit of coding ] - [ coding length-4 ]/2, and when the last two digits of the basin coding are not '00', the basin is a [ basin stage ] stage basin; when the last two bits of the basin code are '00', the basin is a [ basin level +1] level main flow local water collection area. The mathematical formula for calculating the tributary order from the river code is [ river order ] - [ 4 th digit of code ] - [ code length-4 ]/2. For example, the Poyang lake subpolyna of the Changjiang river basin level 9 is coded as 001902, and the Strahler level is: [ number 9 at 4 th bit ] - [ code length 6-4]/2 ═ 9-1 ═ 8. For another example, a certain sub-basin of the 9-level Yangtze river basin is coded as 001900, and the Strahler number is: the number 9 of the 4 th bit of the [ code ] - [ code length 6-4]/2 ═ 9-1 ═ 8 levels, but the last two bits of the basin code are "00", which indicates that the basin is the [ basin level 8+1] ═ 9 levels of the local water collection area of the main stream. Similarly 005801 is the east river basin of the 7-level sub-basins of the 8-level Zhujiang basin.
(3) In the same independent river domain, the longer the length of the sub-domain code is, the smaller the river with the highest grade contained in the sub-domain code is, and the smaller the water collecting area is generally. For example, a stream domain encoded as "00590101" and a stream domain encoded as "005901" are both sub-stream domains of the independent stream domain "0059", and the former is a sub-stream domain further subdivided by the latter.
(4) And between different independent stream domains, the comparison relation can be assisted by simple conversion calculation of coding. For example, 001902 is the Poyang lake basin of the 8-level sub-basin of the 9-level Changjiang river basin, and 005801 is the east river basin of the 7-level sub-basin of the 8-level Zhujiang river basin. As 8-level, the Poyang lake basin may be more comparable to the whole Zhujiang basin in terms of the volume (catchment area of the basin, river size, etc.). The body quantity can be compared simply and directly according to river or river basin codes, and the hydrological analysis is convenient to be related.
An alternative embodiment of the present solution is described below with respect to steps S171 to S175 above:
first, the scheme can encode independent stream domains. Firstly, determining the sequencing value (001-999 value) of an independent basin in China from large area to small area; secondly, determining the highest Strahler river series (value 1-9) contained in the independent basin; and thirdly, taking the area sequence value of the independent flow field as the first 3 bits and the corresponding highest Strahler river level value as the 4 th bit, and forming 4-bit flow field coding of the independent flow field. If the Zhujiang river basin is ranked 5 th according to the descending order of the catchment areas of all independent basins in China, the highest river contained in the Zhujiang river basin is ranked 8, and therefore, the code of the Zhujiang river basin is 0058.
The highest ranked river within the independent river basin is then encoded. The code of the highest-level river in the independent river basin is set to be the same as the river basin code. If the code of the Zhujiang river basin is 0058, the code of the 8-grade river segment contained in the Zhujiang river basin is 0058. In the scheme, all grades of rivers in the independent river basin are coded. And tracing the codes from the downstream to the upstream from the highest-grade river, wherein at the river intersection, the number of the river levels is reduced by one level when the river levels are met, and two bits (values are sequentially selected from 00, 01, 02, 03, … and 99) are added on the basis that the codes of the corresponding rivers are converged into the river codes, so that all the rivers are coded. When the tributary jumps to N levels (N is more than or equal to 1) and is merged into the main stream, the tributary code is added with (N-1) 00's on the basis of the code of the merged river, and the last two bits take values from 01 to 99.
For example, the Zhujiang river basin ranks fifth according to the water collection area in China, and the ranking order is marked as '005'; the highest river grade in the Zhujiang river basin is 8 grades, the code of the whole Zhujiang river basin is 0058, and correspondingly, the code of the highest grade river segment (the 8-grade main stream of the Zhujiang river, the starting point of the 8-grade river segment from the entrance of the Zhujiang river to the sea mouth) in the Zhujiang river basin is 0058. Further, the number of the branches of the east river is "005801" in the next level (level 7) of the Zhujiang river, the number of the branches of the east river is "00580101" in the Xinfengjiang river (level 6), the number of the branches of the Xinfengjiang river is "0058010101" in the horizontal line (level 5), and the number of the branches of the Mixi river (level 4) in the horizontal line is "005801010101" (as shown in fig. 3 and fig. 4). For another example, the first 4-level tributary river segment merging into the east river (coding bit 005801) of the 7-level main stream of zhangjiang from downstream to upstream should increase the coding length by 3 × 2 to 6 bits, and the number of the jumping river segment is 7-4 to 3, so that the coding is "005801" and the number of "00" is increased by 2 times first, and the last two bits take values of 01, so as to obtain the final coding "005801000001" of the tributary (refer to fig. 4). Fig. 4 illustrates the encoding of rivers above level 4 within the east river sub-domain of the pearl river. According to the iteration steps, all river codes can be completed by traversing all rivers forming the river network in the river domain.
And finally, encoding the sub-stream domains contained in the independent stream domain. Under the natural process, the catchment area in the basin can be divided into two parts, namely a sub-basin and a main flow local catchment area. The sub-river basin is the whole water collection range of the next-level branch, and the main flow local water collection area is the local water collection range of the highest-level river in the sub-river basin. For example, the catchment area of the 8-level independent zhuangjiang river basin is formed by splicing 5 contained 7-level branch streams with local catchment areas corresponding to the zhuangjiang main stream river reach (8 levels) (as shown in fig. 5). And further coding the sub-watersheds and the local water collecting areas of the main flows contained in each independent watershed according to the river coding and the incidence relation of the front-section main flows and the tributary water collecting areas. The code of the sub-river basin is set to be the same as the code of the highest-level river contained in the sub-river basin, and the code of the main stream local water collecting area adds '00' to the tail part of the corresponding main stream river code.
Fig. 5 illustrates a zhujiang river basin coding. For example, the catchment area of an 8-level independent zhuangjiang river basin is formed by splicing 5 contained 7-level branches with a local catchment area corresponding to a zhuangjiang main stream river reach (8-level), the sub-basin code where the 5 7 and branch flows are located is "0058" tail adding "01", 02 "," 03 "," 04 "," 05 ", and the code of the 8-level main stream local catchment area is" 0058 "tail adding" 00 ". Wherein, the code of the east river basin of the next level (7 levels) of the Zhujiang river is '005801'; the code of the sub-basin of east river, Xinfeng river basin (level 6) is "00580101", the code of the sub-basin of Xinfeng river, which is connected with the horizontal (level 5) basin, is "0058010101", and the code of the sub-basin of continuous horizontal, dense stream river (level 4) is "005801010101".
It should be noted that, according to the present invention, all rivers and watersheds of the independent zhuang watersheds are encoded. Table 1 below illustrates a specific application in the zhujiang river basin. Table 1 illustrates the hierarchical structure and internal catchment topology information of the zhujiang river basin. The area of the Zhujiang river basin is about 45 km2, the total river length is about 20 km, the highest river grade in the river basin is 8, the number of the 4-7 level sub-basins is 467, 115, 28 and 5 in sequence, and the average water collection area of the 4-7 level sub-basins is 606, 2264, 10692 and 71739km2 in sequence; the length of the section of the 8-level main stream of the Zhujiang is about 490km, and the average lengths of the 4-level to 7-level rivers are respectively 15 km, 37 km, 72 km and 225km in sequence. Table 1 also illustrates the river-basin coding system for the zhujiang basin. The codes of 5 7-level sub-domains in the Zhujiang river basin are respectively '005801', '005802', '005803', '005804', '005805' from downstream to upstream; the code of the 8-level main flow local water collecting area is '005800'; taking 7-level sub-watersheds coded as '005801' as an example, 2 6-level sub-watersheds are arranged in the watersheds, the watersheds are coded as '00580101', '00580102', and the local watersheds of 7-level main streams are coded as '00580100'; taking the 6-level sub-watershed coded as "00580101" as an example, there are 2 5-level sub-watersheds in the watershed, the watershed codes are respectively "0058010101", "0058010102", and the code of the 6-level main stream local water collection area is "0058010100".
TABLE 1 characteristics of the coding of the Yangtze river basin and the river network
By analogy, all rivers and watersheds in china can be encoded by using the above encoding technique, and the initial encoding is shown in table 2 below.
TABLE 2 Chinese interior representative river basin and river network coding
To sum up, the scheme discloses a Chinese basin coding method based on the Strahler river series, which comprises the following steps: preprocessing topographic Data (DEM), including inner flow area processing, yellow river suspension river processing and depression processing; extracting a river network and dividing a drainage basin, wherein the processes comprise flow direction and catchment area calculation, river extraction, drainage basin division and the like; carrying out river grading by adopting a Strahler method; making river and river basin coding rules; the watershed and the river are coded. The river network and river basin extraction and coding method in the scheme is realized through a C + + program and is completely independent of third-party software. The scheme provides a coding scheme which can carry out standard unification and systematicness on most independent drainage basins (the total coverage area exceeds 99 percent of the territorial area) and rivers with different sizes in the Chinese border. The technical problems that the river covered by the codes is limited and the expansibility is poor due to the existing coding method of the existing coding method are solved.
Example two
As shown in fig. 6, there is provided a Strahler hierarchy-based encoding apparatus for implementing the method of the first embodiment, which can also be arranged in a computer device, the apparatus comprising: a preprocessing unit 60, configured to perform preprocessing on the acquired DEM data, where the preprocessing at least includes: treating an inner flow area, treating a yellow river and a dang river and treating a depression; the analysis unit 62 is configured to analyze the preprocessed DEM data to obtain river network data, where the river network data includes a plurality of basins and a plurality of rivers; a classification unit 64 for classifying the plurality of rivers based on a Strahler classification device; and the coding unit 66 is used for coding the plurality of river areas and the plurality of rivers according to a preset coding strategy and through the grading of the plurality of rivers.
It should be noted that the scheme provides a Chinese river basin coding scheme based on the Strahler river series through the device, and the scheme can be realized by compiling a whole set of C + + programs, adopting a unified algorithm and topographic Data (DEM), extracting domestic rivers in China, dividing river basins and carrying out Strahler river grading, realizing the coding of the rivers and the river basins, and providing basic reference for promoting water conservancy information management, hydrological scientific research and hydrological information sharing and communication among industries. Therefore, the technical problems of limited river covered by the codes and poor expansibility caused by the existing coding method of the existing coding method are solved.
Optionally, the watershed comprises at least an independent watershed and a sub-watershed.
Optionally, the river network data includes a plurality of grids, wherein the analysis unit includes: the processing module is used for processing the grids through a D8 algorithm to generate the flow direction of each grid; calculating and generating the water collecting area of each grid; the first determining module is used for determining the grids meeting the preset water collecting area threshold value as river network grids; the first acquisition module is used for acquiring a watershed outlet in a river network grid; the first statistic module is used for counting river network grids flowing into an outlet of a drainage basin; the second determining module is used for determining a water collecting range corresponding to the outlet of the drainage basin according to the river network grids flowing into the outlet of the drainage basin and the flow direction of each grid; and the third determining module is used for determining the river and the river basin according to the water collecting range.
Optionally, the classification unit includes: the fourth determining module is used for determining the river network grid meeting the preset conditions as a river source grid; the second acquisition module is used for acquiring at least one downstream grid of the river source grid according to the flow direction of each grid; the second statistical module is used for counting the number of grids flowing into the downstream; and the judging module is used for judging the grade of the river where the downstream grid is located according to the number.
Optionally, the encoding unit includes: the second calculation module is used for calculating and obtaining the areas of the multiple independent drainage basins; the obtaining module is used for obtaining the area ranking of each independent basin according to the areas of the independent basins; the first generation module is used for generating the code of each independent basin according to the area ranking of the independent basins and the highest ranking of the rivers contained in the independent basins; the second generation module is used for generating all river codes contained in the independent watershed according to the independent watershed codes and all river grades contained in the independent watershed; and the third generation module is used for generating the codes of the sub-watersheds contained in the independent watersheds according to the codes of the rivers with the highest grades contained in the independent watersheds.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A method for coding a river and a river based on Strahler classification, which is characterized by comprising the following steps:
preprocessing acquired DEM data, wherein the preprocessing at least comprises the following steps: treating an inner flow area, treating a yellow river and a dang river and treating a depression;
analyzing the preprocessed DEM data to obtain river network data, wherein the river network data at least comprise a plurality of river basins and a plurality of rivers;
grading the plurality of rivers based on a Strahler grading method;
and coding the plurality of river basins and the plurality of rivers according to a preset coding strategy and through the grading of the plurality of rivers.
2. The method of claim 1, wherein the watershed comprises at least an independent watershed and a sub-watershed.
3. The method of claim 2, wherein the river network data comprises a plurality of grids, and wherein the step of analyzing the river network data from the pre-processed DEM data comprises:
processing the grids through a D8 algorithm to generate the flow direction of each grid;
calculating and generating the water collecting area of each grid;
determining the grids meeting the preset water collecting area threshold value as river network grids;
acquiring a watershed outlet in the river network grid;
counting river network grids flowing into the watershed outlet;
determining a water collection range corresponding to the watershed outlet according to the river network grids flowing into the watershed outlet and the flow direction of each grid;
and determining the river and the river basin according to the water collection range.
4. The method of claim 3, wherein the step of fractionating the plurality of rivers based on a Strahler fractionation method comprises:
determining the river network grids meeting preset conditions as river source grids;
obtaining at least one downstream grid of the river source grid according to the flow direction of each grid;
counting the number of the grids flowing into the downstream grid;
and judging the grade of the river where the downstream grid is located according to the number.
5. The method of claim 4, wherein the step of encoding the plurality of basins and the plurality of rivers according to a preset encoding strategy and by a hierarchy of the plurality of rivers comprises:
calculating to obtain the areas of the independent drainage basins;
obtaining the area ranking of each independent basin according to the areas of the independent basins;
generating a code of each independent basin according to the area ranking of the independent basins and the highest ranking of rivers contained in the independent basins;
generating codes of all rivers contained in the independent watershed according to the codes of the independent watershed and the grades of all the rivers contained in the independent watershed;
and generating the codes of the sub-watersheds contained in the independent watersheds according to the codes of the rivers with the highest grades contained in the independent watersheds.
6. An encoding apparatus based on Strahler classification, the apparatus comprising:
the device comprises a preprocessing unit, a data processing unit and a data processing unit, wherein the preprocessing unit is used for preprocessing the acquired DEM data, and the preprocessing at least comprises the following steps: treating an inner flow area, treating a yellow river and a dang river and treating a depression;
the analysis unit is used for analyzing the preprocessed DEM data to obtain river network data, wherein the river network data comprise a plurality of river basins and a plurality of rivers;
a classifying unit for classifying the plurality of rivers based on a Strahler classifier;
and the coding unit is used for coding the plurality of river areas and the plurality of rivers according to a preset coding strategy and through the grading of the plurality of rivers.
7. The apparatus of claim 6, wherein the watershed comprises at least an independent watershed and a sub-watershed.
8. The apparatus of claim 7, wherein the river network data comprises a plurality of grids, and wherein the analysis unit comprises:
the processing module is used for processing the grids through a D8 algorithm to generate the flow direction of each grid;
calculating and generating the water collecting area of each grid;
the first determining module is used for determining the grids meeting the preset water collecting area threshold value as river network grids;
the first acquisition module is used for acquiring a watershed outlet in the river network grid;
the first statistic module is used for counting river network grids flowing into the drainage basin outlet;
the second determining module is used for determining a water collecting range corresponding to the watershed outlet according to the river network grids flowing into the watershed outlet and the flow direction of each grid;
and the third determining module is used for determining the river and the river basin according to the water collecting range.
9. The apparatus of claim 8, wherein the ranking unit comprises:
the fourth determining module is used for determining the river network grid meeting the preset conditions as a river source grid;
the second acquisition module is used for acquiring at least one downstream grid of the river source grid according to the flow direction of each grid;
the second statistical module is used for counting the number of the grids flowing into the downstream;
and the judging module is used for judging the grade of the river where the downstream grid is located according to the number.
10. The apparatus of claim 9, wherein the encoding unit comprises:
the second calculation module is used for calculating and obtaining the areas of the independent drainage basins;
the obtaining module is used for obtaining the area ranking of each independent basin according to the areas of the independent basins;
a first generation module, configured to generate a code for each independent basin according to the area rank of the independent basin and the highest rank of the river included in the independent basin;
a second generation module, configured to generate codes of all rivers included in the independent watershed according to the codes of the independent watershed and the grades of all the rivers included in the independent watershed;
and the third generation module is used for generating the codes of the sub-watersheds contained in the independent watersheds according to the codes of the rivers with the highest grades contained in the independent watersheds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633575.9A CN112650827B (en) | 2020-12-31 | 2020-12-31 | River basin and river coding method and device based on Strahler classification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633575.9A CN112650827B (en) | 2020-12-31 | 2020-12-31 | River basin and river coding method and device based on Strahler classification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112650827A true CN112650827A (en) | 2021-04-13 |
| CN112650827B CN112650827B (en) | 2023-11-21 |
Family
ID=75366837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011633575.9A Active CN112650827B (en) | 2020-12-31 | 2020-12-31 | River basin and river coding method and device based on Strahler classification |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112650827B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117648907A (en) * | 2023-12-12 | 2024-03-05 | 水利部信息中心(水利部水文水资源监测预报中心) | Length-adaptive flood prediction river basin coding method and system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080195362A1 (en) * | 2003-01-31 | 2008-08-14 | Fmsm Engineers, Inc. | River Assessment, Monitoring and Design System |
| US20090087029A1 (en) * | 2007-08-22 | 2009-04-02 | American Gnc Corporation | 4D GIS based virtual reality for moving target prediction |
| CN102034001A (en) * | 2010-12-16 | 2011-04-27 | 南京大学 | Design method for distributed hydrological model by using grid as analog unit |
| CN107491758A (en) * | 2017-08-18 | 2017-12-19 | 南京林业大学 | Yangtze river basin water body information and its space encoding method |
| CN107704592A (en) * | 2017-10-12 | 2018-02-16 | 滁州学院 | A kind of flood forecasting service construction method based on WebGIS |
| CN108755565A (en) * | 2018-06-06 | 2018-11-06 | 黄河水利委员会黄河水利科学研究院 | A kind of multi-spatial scale watershed runoff prediction technique and device |
| CN108804804A (en) * | 2018-06-05 | 2018-11-13 | 中国水利水电科学研究院 | A kind of big quantity sub-basin fast encoding method based on the digital network of waterways |
| CN109325084A (en) * | 2018-08-06 | 2019-02-12 | 青海中水数易信息科技有限责任公司 | A kind of network of waterways drawing generating method based on GIS |
| CN109472868A (en) * | 2018-11-06 | 2019-03-15 | 中国水利水电科学研究院 | A kind of watershed partitioning method in continental river basin |
| CN110852232A (en) * | 2019-11-05 | 2020-02-28 | 河海大学 | River bank vegetation coverage extraction method based on mountain river classification |
-
2020
- 2020-12-31 CN CN202011633575.9A patent/CN112650827B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080195362A1 (en) * | 2003-01-31 | 2008-08-14 | Fmsm Engineers, Inc. | River Assessment, Monitoring and Design System |
| US20090087029A1 (en) * | 2007-08-22 | 2009-04-02 | American Gnc Corporation | 4D GIS based virtual reality for moving target prediction |
| CN102034001A (en) * | 2010-12-16 | 2011-04-27 | 南京大学 | Design method for distributed hydrological model by using grid as analog unit |
| CN107491758A (en) * | 2017-08-18 | 2017-12-19 | 南京林业大学 | Yangtze river basin water body information and its space encoding method |
| CN107704592A (en) * | 2017-10-12 | 2018-02-16 | 滁州学院 | A kind of flood forecasting service construction method based on WebGIS |
| CN108804804A (en) * | 2018-06-05 | 2018-11-13 | 中国水利水电科学研究院 | A kind of big quantity sub-basin fast encoding method based on the digital network of waterways |
| CN108755565A (en) * | 2018-06-06 | 2018-11-06 | 黄河水利委员会黄河水利科学研究院 | A kind of multi-spatial scale watershed runoff prediction technique and device |
| CN109325084A (en) * | 2018-08-06 | 2019-02-12 | 青海中水数易信息科技有限责任公司 | A kind of network of waterways drawing generating method based on GIS |
| CN109472868A (en) * | 2018-11-06 | 2019-03-15 | 中国水利水电科学研究院 | A kind of watershed partitioning method in continental river basin |
| CN110852232A (en) * | 2019-11-05 | 2020-02-28 | 河海大学 | River bank vegetation coverage extraction method based on mountain river classification |
Non-Patent Citations (5)
| Title |
|---|
| ABHINAYA MOHAN 等: "Applications of spatio-temporal data mining to north platter river reservoirs", 《IDEAS \'14: PROCEEDINGS OF THE 18TH INTERNATIONAL DATABASE ENGINEERING & APPLICATIONS SYMPOSIUM》, pages 306 * |
| 刘凡 等: "DEM水平分辨率越高提取的河长越准确?", vol. 52, no. 05, pages 610 - 615 * |
| 张晓娇 等: "基于DEM的大清河子流域划分方法", vol. 42, no. 06, pages 13 - 17 * |
| 李照会: "基于DEM的山丘区小流域特征研究及应用", pages 008 - 60 * |
| 黄煌: "基于D-TIN的数字流域分析算法研究", 《中国优秀硕士学位论文全文数据库 基础科学辑》, no. 03, pages 008 - 29 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117648907A (en) * | 2023-12-12 | 2024-03-05 | 水利部信息中心(水利部水文水资源监测预报中心) | Length-adaptive flood prediction river basin coding method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112650827B (en) | 2023-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112270266B (en) | Multi-feature constrained mesh river mainstream identification method | |
| CN108804804A (en) | A kind of big quantity sub-basin fast encoding method based on the digital network of waterways | |
| CN109325084A (en) | A kind of network of waterways drawing generating method based on GIS | |
| CN107315813B (en) | Method for constructing and simplifying hierarchical relation of tree-shaped river system constrained by stroke features | |
| CN106780737A (en) | A kind of method that utilization digital elevation model calculates Geomorphologic Instantaneous Unit Hydrograph probability | |
| Nitheshnirmal et al. | Prioritization of erosion prone micro-watersheds using morphometric analysis coupled with multi-criteria decision making | |
| Rosim et al. | TerraHidro: a distributed hydrology modelling system with high quality drainage extraction | |
| CN112650827B (en) | River basin and river coding method and device based on Strahler classification | |
| Arcaute et al. | Hierarchical organisation of Britain through percolation theory | |
| CN113779041B (en) | Small drainage basin dividing and encoding method | |
| CN110737931A (en) | ArcGIS-based railway bridge crossing hydrological key parameter extraction method | |
| CN109697521A (en) | Method based on arbitrary cross-section building flood forecasting scheme | |
| CN115964855A (en) | Sub-basin dividing method based on water engineering and hydrological station | |
| CN115272866A (en) | Mountain landform form classification method based on positive and negative landforms and application | |
| CN115496148A (en) | Method and device for evaluating large-scale hydrological situation change of river | |
| CN109146194A (en) | A kind of Runoff forestry method encoding interconnection vector machine certainly based on change mode convolution | |
| Jones et al. | Aquatic Ecosystem Classification for Ontario’s Rivers and Streams: Version | |
| Moravej et al. | Comparison of automated and manual landform delineation in semi detailed soil survey procedure | |
| CN109190216A (en) | A kind of continent river emptying into the sea auto-sequencing coding method based on DEM | |
| Zhang et al. | Comparing the sensitivity of pixel-based and sub-watershed-based analytic hierarchy process to weighting criteria for flood hazard estimation | |
| CN110991019A (en) | Automatic classification algorithm for coastal tidal ditches | |
| Sowmya et al. | Watershed delineation using SRTM DEM for Bangalore South Region | |
| CN115830443A (en) | Coding method for large-scale regional water resource partition | |
| Dai et al. | An automated bottom up hydrologic coding system for Dendritic River system | |
| Fawen et al. | Characterization and Classification of River Network Types |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |