CN107103088A - A kind of DEM grid cells size extracts the evaluation method of Influencing Mechanism to water catchment area - Google Patents
A kind of DEM grid cells size extracts the evaluation method of Influencing Mechanism to water catchment area Download PDFInfo
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- CN107103088A CN107103088A CN201710302749.5A CN201710302749A CN107103088A CN 107103088 A CN107103088 A CN 107103088A CN 201710302749 A CN201710302749 A CN 201710302749A CN 107103088 A CN107103088 A CN 107103088A
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- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses the evaluation method that a kind of DEM grid cells size extracts Influencing Mechanism to water catchment area, water catchment area is the elementary cell of Distributed Hydrological earth's surface product flood simulation, and charge for remittance Division difference, which accumulates flooded analog result to heavy rain, has material impact.When carrying out the extraction of research area water catchment area using hydrological analysis instrument, when DEM grid cells are of different sizes, carry out four key links of water catchment area extraction, when flowing to extraction, flow rate calculation, current length computation, Segmented fluid theory, each step can all produce change, and influenced each other between each step, the finally extraction to water catchment area produces different degrees of influence.The present invention uses different size of grid cell, by analyzing the intensity of variation of water (flow) direction, cumulant of confluxing, current length, Segmented fluid theory under different grid cell size cases, realize in the case where grid cell is of different sizes, the evaluation for the influence degree that water (flow) direction, cumulant of confluxing, current length, Segmented fluid theory are extracted to water catchment area.
Description
Technical field
The present invention relates to a kind of evaluation method for extracting influence on water catchment area based on DEM grid cells size, belong to geographical
Areas of information technology.
Background technology
Digital complex demodulation be according to regular grid by regional space cutting be several regular grid units, often
One bottom surface height value of individual grid unit correspondence.Water catchment area is the elementary cell of Distributed Hydrological earth's surface product flood simulation, water catchment area
Dividing different flood analog results of being accumulated to heavy rain has material impact.ArcGIS hydrological analyses module can be by flowing to analysis, converging
Flow the key link such as cumulant calculating, current length computation, Segmented fluid theory and carry out water catchment area extraction.Cumulant of wherein confluxing is root
The water (flow) direction data of area's landform calculate the water numerical value flowed through in every place according to the study, then by each grid numerical value and grid face
Product is multiplied, and obtains each grid current volume, i.e. charge for remittance amount.Extracted carrying out research area water catchment area using hydrological analysis instrument
When, when DEM grid cells are of different sizes, four key links of water catchment area extraction are carried out, that is, flow to extraction, flow rate calculation, water
When flowing length computation, Segmented fluid theory, each step can all produce change, and then influence can be produced on next step, and final to converging
The extraction in pool produces different degrees of influence.Existing algorithm points out the best DEM elevation spatial resolutions of simulation effect, still
When carrying out water (flow) direction extraction, the calculating for cumulant of confluxing, current length computation, Segmented fluid theory, grid cell size changes
Become to the influence evaluation method of the extraction of water catchment area and indefinite.
The content of the invention
It is an object of the invention to overcome the shortcomings of prior art presence, there is provided a kind of more direct DEM grid cells
Extract the evaluation method of Influencing Mechanism in size meeting water catchment area.
The technical solution adopted by the present invention is：A kind of DEM grid cells size extracts the evaluation of Influencing Mechanism to water catchment area
Method, comprises the following steps：
Step one：The DEM grid cells for studying area are adjusted to different size.
Step 2：The dem data of different sizes to grid cell, current are carried out using ArcGIS hydrological analyses instrument respectively
Extract calculating, the calculating of charge for remittance amount, the calculating of current length computation, Segmented fluid theory and the extraction of water catchment area in direction.
Step 3：Compare grid cell it is of different sizes when, it is long that water (flow) direction extracts result, charge for remittance amount result of calculation, current
Maximum, minimum value, the standard deviation situation of change of result of calculation are spent, and after being split, number and area, the standard in basin
Poor situation of change.
Step 4：By the comparison of step 3, obtain grid cell it is of different sizes in the case of, flow direction, charge for remittance amount, current are long
Degree, the amplitude of variation of Segmented fluid theory.
Step 5：Carry out charge for remittance Division.Compare the number of final water catchment area, it is the minimum and maximum area of water catchment area, flat
Equal area, standard deviation.In the case that evaluation grid cell is of different sizes, water (flow) direction, cumulant of confluxing, current length, basin
Split the influence degree extracted to water catchment area.
Beneficial effects of the present invention：The present invention uses different size of grid cell, by analyzing water (flow) direction, confluxing tired
The intensity of variation of accumulated amount, current length, Segmented fluid theory under different grid cell size cases, is realized in grid cell size not
With in the case of, the evaluation for the influence degree that water (flow) direction, cumulant of confluxing, current length, Segmented fluid theory are extracted to water catchment area.
Explanation：Each part being not known in the present invention can use prior art to be realized.
Brief description of the drawings
Fig. 1 is different size grid cell DEM (units：Rice)；
Fig. 2 is that different size grid cell water (flow) direction extracts comparative result figure (wherein, 1：East, 2：The southeast, 4：South, 8：
Southwest, 16：West, 32：Northwest, 64：North, 128：Northeast).
Embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
Assuming that three groups of data be respectively the DEM that the grid cell length of side is 30 meters, the DEM that the grid cell length of side is 50 meters and
Grid cell is 100 meters of DEM, and water catchment area, which is extracted, when realizing that DEM grid cells are of different sizes using this three groups of data influences
Evaluation method.
Step one：The DEM grid cells for studying area are adjusted to different size.
In this example, research area's grid cell length of side is adjusted to as 30 meters, 50 meters and 100 meters, such as Fig. 1.
Step 2：The dem data of different sizes to grid cell, current are carried out using ArcGIS hydrological analyses instrument respectively
Extract calculating, the calculating of charge for remittance amount, the calculating of current length computation, Segmented fluid theory and the extraction of water catchment area in direction.
It is respectively 30 meters, 50 meters, 100 meters to grid cell first using ArcGIS hydrological analysis instruments in this example
Dem data is carried out filling out low-lying area, and then using flow direction, flow, current length, basin domain analysis tool bar, water (flow) direction is extracted respectively, is counted
Charge for remittance amount, current length are calculated, basin is divided.
Step 3：Compare grid cell it is of different sizes when, it is long that water (flow) direction extracts result, charge for remittance amount result of calculation, current
Maximum, minimum value, the standard deviation situation of change of result of calculation are spent, and after being split, number and area, the standard in basin
Poor situation of change.
Flow direction extracts results contrast：When studying the grid cell size variation in area, the grid quantity of each flow direction value
How many become is turned to shown in Fig. 2.Also, reduce with the continuation of grid cell size, the grid quantity of each flow direction value
Order keeps stable, does not change.
Charge for remittance amount comparison of computational results：When grid cell is of different sizes, the result of variations of grid charge for remittance amount is as shown in table 1.
The different size grid cell charge for remittance amount of table 1 calculates Comparative result (unit：Cubic meter)
Current length computation results contrast：When grid cell size changes, current length change Amplitude Ratio is larger.Table 2
For different grid cell sizes, the maximum of current length computation, minimum value, value for 0 region percentage, average value with
And standard deviation.
The different size grid cell current length computation Comparative result (unit of table 2：Rice)
Segmented fluid theory results contrast：When grid cell size variation, the maximum of Segmented fluid theory, minimum value, basin number
Amount, maximum drainage area, average drainage area, standard deviation change are as shown in table 3.
The different size grid cell Segmented fluid theory Comparative result (unit of table 3：Square metre)
Step 4：By the comparison of step 3, obtain grid cell it is of different sizes in the case of, flow direction, charge for remittance amount, current are long
Degree, the amplitude of variation of Segmented fluid theory.
In this example, pass through the comparison of step 3, it was therefore concluded that：When grid cell becomes big, flow direction change is smaller, grinds
The charge for remittance amount difference for studying carefully area becomes big, and current difference in length diminishes, and causes the difference of Segmented fluid theory result to diminish.
Step 5：Carry out charge for remittance Division.Compare the number of final water catchment area, it is the minimum and maximum area of water catchment area, flat
Equal area, standard deviation.In the case that evaluation grid cell is of different sizes, water (flow) direction, cumulant of confluxing, current length, basin
Split the influence degree extracted to water catchment area.
In this example, using watershed tool bar, water catchment area is divided.When table 4 is that grid cell is of different sizes, water catchment area number
Amount, maximum, minimum value, maximum water catchment area area, most descend water catchment area area, average area, the comparative result of standard deviation.
The different size grid cell water catchment area division result contrast (unit of table 4：Square metre)
When carrying out water catchment area extraction, when grid cell becomes big, because the current length in research area, Segmented fluid theory calculate knot
Fruit difference diminishes, and illustrates that area differentiation is not obvious, and the area for ultimately resulting in water catchment area reduces, and the number of water catchment area is also reduced；When
Grid cell diminishes, and studies the current length in area, Segmented fluid theory result of calculation difference and becomes big, illustrates that area differentiation is more obvious,
The area of water catchment area becomes big, and the number of water catchment area also accordingly increases.
Explanation：Each part being not known in this implementation example can use prior art to be realized.
Claims (1)
1. a kind of DEM grid cells size extracts the evaluation method of Influencing Mechanism to water catchment area, it is characterised in that：Including following step
Suddenly：
Step one：The DEM grid cells for studying area are adjusted to different size；
Step 2：The dem data of different sizes to grid cell, water (flow) direction is carried out using ArcGIS hydrological analyses instrument respectively
Extract calculating, the calculating of charge for remittance amount, the calculating of current length computation, Segmented fluid theory and the extraction of water catchment area；
Step 3：Compare grid cell it is of different sizes when, water (flow) direction extract result, charge for remittance amount result of calculation, current length gauge
Maximum, minimum value, the standard deviation situation of change of result are calculated, and after being split, the number and area in basin, standard deviation change
Change situation；
Step 4：By the comparison of step 3, obtain grid cell it is of different sizes in the case of, flow direction, charge for remittance amount, current length,
The amplitude of variation of Segmented fluid theory；
Step 5：Carry out charge for remittance Division；Compare number, minimum and maximum area, the centre plane of water catchment area of final water catchment area
Product, standard deviation；In the case that evaluation grid cell is of different sizes, water (flow) direction, cumulant of confluxing, current length, Segmented fluid theory
The influence degree extracted to water catchment area.
Explanation：Each part being not known in the present invention can use prior art to be realized.
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Cited By (6)
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| CN109471912A (en) * | 2018-10-24 | 2019-03-15 | 上海市政工程设计研究总院（集团）有限公司 | A kind of the extremal region division and extreme value extracting method of two-dimension GIS raster data |
| CN110335355A (en) * | 2019-07-16 | 2019-10-15 | 江西省水利规划设计研究院 | A kind of high automatic calculating method of large-scale shallow water lake |
| CN110442932A (en) * | 2019-07-19 | 2019-11-12 | 河海大学 | A kind of DEM water (flow) direction analogy method of combination tangential curvature and Dinf method |
| CN111046551A (en) * | 2019-12-10 | 2020-04-21 | 河海大学 | Urban group drainage process simulation method |
| CN113609683A (en) * | 2021-08-06 | 2021-11-05 | 北京工业大学 | Rainwater pipe net catchment area division method based on basin analysis and Thiessen polygon |
| CN116109143A (en) * | 2023-04-07 | 2023-05-12 | 南京信息工程大学 | Method, system, device and storage medium for determining topographic relief impact index for storm flood disaster risk analysis |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109471912A (en) * | 2018-10-24 | 2019-03-15 | 上海市政工程设计研究总院（集团）有限公司 | A kind of the extremal region division and extreme value extracting method of two-dimension GIS raster data |
| CN110335355A (en) * | 2019-07-16 | 2019-10-15 | 江西省水利规划设计研究院 | A kind of high automatic calculating method of large-scale shallow water lake |
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| CN110442932A (en) * | 2019-07-19 | 2019-11-12 | 河海大学 | A kind of DEM water (flow) direction analogy method of combination tangential curvature and Dinf method |
| CN110442932B (en) * | 2019-07-19 | 2022-09-23 | 河海大学 | DEM water flow direction simulation method combining section curvature and Dinf method |
| CN111046551A (en) * | 2019-12-10 | 2020-04-21 | 河海大学 | Urban group drainage process simulation method |
| CN111046551B (en) * | 2019-12-10 | 2020-11-20 | 河海大学 | Urban group drainage process simulation method |
| CN113609683A (en) * | 2021-08-06 | 2021-11-05 | 北京工业大学 | Rainwater pipe net catchment area division method based on basin analysis and Thiessen polygon |
| CN113609683B (en) * | 2021-08-06 | 2024-02-06 | 北京工业大学 | Rainwater pipe network sub-catchment area dividing method based on basin analysis and Thiessen polygons |
| CN116109143A (en) * | 2023-04-07 | 2023-05-12 | 南京信息工程大学 | Method, system, device and storage medium for determining topographic relief impact index for storm flood disaster risk analysis |
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