CN110686862A - Flow process rasterization method based on soil infiltration capacity - Google Patents
Flow process rasterization method based on soil infiltration capacity Download PDFInfo
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Abstract
The invention provides a flow process rasterization method based on soil infiltration capacity, which comprises the following steps: step S1, converting the flow process line of the cross section of the basin outlet into a water level process line through a water level-flow relation curve; step S2, determining flow distribution weights in different grids according to the land utilization type and the soil characteristic data; step S3, determining the distribution proportion of the radial flow of different grids, and calculating the distribution proportion of all grids in the watershed according to the flow distribution weight of each grid; and step S4, distributing the flow of the outlet section of the basin into each grid according to the distribution proportion to realize flow rasterization. The method considers the influence of the soil infiltration capacity of different grids of the drainage basin on the yield and the flow, follows the drainage basin yield and confluence mechanism and the physical mechanism of the hydrological process, reduces the problem of calculation errors caused by average distribution, and has the advantages of simple calculation process, good operation and easy popularization.
Description
Technical Field
The invention relates to the technical field of data downscaling, in particular to a flow process rasterization method based on soil infiltration capacity.
Background
The coupling of hydrologic and hydrodynamic predictions is one of the hot problems in hydrologic research. The important link involved in the hydrographic-hydrodynamic coupling method is the data connection between the hydrographic model and the hydrodynamic model, the calculation result of the hydrographic model is that the flow process of the outlet section of the drainage basin is used as the input of the two-dimensional hydrodynamic model, the two-dimensional hydrodynamic model performs calculation based on the grid data, and the calculation can be performed only by converting the hydrographic data of one-dimensional space scale into the two-dimensional space scale, namely rasterization. However, no mature flow data rasterization method exists at present, and a common method is to equally distribute the flow to each grid, and the method has the disadvantage that the spatial heterogeneity of a watershed is not considered, that is, the soil infiltration capacity of each grid is different, so that the processing directly causes a large error in the spatial distribution of the two-dimensional hydrodynamic calculation result.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
Therefore, the invention aims to provide a flow process rasterization method based on soil infiltration capacity.
In order to achieve the above object, an embodiment of the present invention provides a flow process rasterization method based on soil infiltration capacity, including the following steps:
step S1, converting the flow process line of the cross section of the basin outlet into a water level process line through a water level-flow relation curve;
step S2, determining flow distribution weights in different grids according to the land utilization type and the soil characteristic data;
step S3, determining the distribution proportion of the radial flow of different grids, and calculating the distribution proportion of all grids in the watershed according to the flow distribution weight of each grid;
and step S4, distributing the flow of the outlet section of the basin into each grid according to the distribution proportion to realize flow rasterization.
Further, in the step S2, the land use type is a water permeability factor; the soil characteristic data includes: soil structure and initial water content.
Further, in step S2, determining the flow distribution weights in different grids includes determining weights representing the soil infiltration capacity of different grids.
Further, in step S3, the calculating an allocation ratio of all the grids in the drainage basin according to the flow rate allocation weight of each grid includes:
wherein, Pi，jCharacterizing a water permeability factor of the grid (i, j); si，jCharacterizing the soil structure of grid (i, j); wi，jIs the initial moisture content of the grid (i, j); i and j respectively represent the serial numbers of the grids in the x and y directions; m and n are the total number of the grids in the x and y directions of the two-dimensional grid; PRi，jThe distribution proportion of net rainfall for different grids.
Further, in the step S4, the distributing the flow rate of the outlet section of the flow field into each grid according to the distribution ratio includes:
EPi，j＝PRi，j×NR，
among them, EPi，jA grid value representing a flow rate; NR is the flow value of the outlet section of the basin at a certain moment. 6
According to the flow process rasterization method based on the soil infiltration capacity, provided by the embodiment of the invention, soil characteristic data (water permeability factors, soil structures and initial water content) are adopted to represent the soil infiltration capacity, the influence of the three factors on the production flow of a drainage basin is fully considered, the influence of the soil infiltration capacity of different grids of the drainage basin on the production flow is considered, the physical mechanism of a drainage basin production convergence mechanism and a hydrological process is followed, the problem of calculation errors caused by average distribution is reduced, and the calculation process is simple, easy to operate and easy to popularize. The method follows a basin production convergence mechanism and a physical mechanism of a hydrological process, reduces the calculation error caused by simple averaging in the traditional method, and the result can be directly applied to the simulation calculation of the two-dimensional hydrodynamic model.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a flow process rasterization method based on soil infiltration capacity in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of a flow process rasterization method based on soil infiltration capacity according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 and 2, a flow process rasterization method based on soil infiltration capacity of an embodiment of the invention includes the following steps:
and step S1, converting the flow process line of the cross section of the outlet of the basin into a water level process line (NR, unit: meter) through a water level-flow relation curve. This is because the flow rate must be converted to the water level for subsequent calculation.
And step S2, determining flow distribution weights in different grids according to the land use type and the soil characteristic data.
In the step, the water permeability factor P is determined with reference to land utilization types, wherein the weights of common land utilization types are ranked in order of forest land < sparse land < shrubbery land < grassland < cultivated land < bare land < water area < construction land, and specific values are determined with reference to roughness ratios of different land utilization types.
The soil property data includes: soil structure S and initial water content W. The soil structure is generally divided into three conditions of compaction, undisturbed state and scarification, specific values are determined by referring to infiltration rates of different soil structures, and the reference values are 1 for compaction, 0.7 for undisturbed state and 0.3 for scarification. The initial water content is determined according to actual conditions, and the percentage can be directly adopted for calculation in practical application.
It should be noted that, determining the flow distribution weights in different grids, i.e. determining the weights representing the soil infiltration capacity of different grids.
Specifically, in this step, reference values of different grid water permeability factors are determined according to land use types, as shown in table 1. The land use types include: woodland, sparsely, brush, grass, cultivated land, bare land, waters and construction land, table 1 was obtained based on application experience and physical experiments. Reference values for the soil structure (compaction value of 1, undisturbed value of 0.7, scarification value of 0.3).
TABLE 1 reference values for water permeability factors of different grids
| Type of land use | Forest land | Dredging field | Shrub forest | Grass land | Cultivation of land | Bare land | Water area | Land for construction |
| Factor of water permeability | 1 | 2 | 3 | 6.5 | 7 | 8.5 | 10 | 10 |
Step S3 is to determine the distribution ratio of the radial flows of different grids, and calculate the distribution ratio of all the grids in the watershed according to the flow distribution weight of each grid.
Specifically, calculating the allocation proportion of all the grids in the basin according to the flow allocation weight of each grid includes:
wherein, Pi，jCharacterizing a water permeability factor of the grid (i, j); si，jCharacterizing the soil structure of grid (i, j); wi，jIs the initial moisture content of the grid (i, j); i and j respectively represent the serial numbers of the grids in the x and y directions; m and n are the total number of the grids in the x and y directions of the two-dimensional grid; PRi，jThe distribution proportion of net rainfall for different grids.
And step S4, distributing the flow of the outlet section of the basin into each grid according to the distribution proportion to realize flow rasterization.
Specifically, the following formula is adopted to distribute the surface runoff process, namely the drainage basin yield (net rainfall) into each grid according to the distribution proportion, and the method comprises the following steps:
EPi，j＝PRi，j×NR，
among them, EPi，jA grid value representing a flow rate; NR is the surface runoff process of the outlet section of the drainage basin at a certain moment, namely drainage basin yield (net rainfall).
According to the flow process rasterization method based on the soil infiltration capacity, provided by the embodiment of the invention, soil characteristic data (water permeability factors, soil structures and initial water content) are adopted to represent the soil infiltration capacity, the influence of the three factors on the production flow of a drainage basin is fully considered, the influence of the soil infiltration capacity of different grids of the drainage basin on the production flow is considered, the physical mechanism of a drainage basin production convergence mechanism and a hydrological process is followed, the problem of calculation errors caused by average distribution is reduced, and the calculation process is simple, easy to operate and easy to popularize. The method follows a basin production convergence mechanism and a physical mechanism of a hydrological process, reduces the calculation error caused by simple averaging in the traditional method, and the result can be directly applied to the simulation calculation of the two-dimensional hydrodynamic model.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A flow process rasterization method based on soil infiltration capacity is characterized by comprising the following steps:
step S1, converting the flow process line of the cross section of the basin outlet into a water level process line through a water level-flow relation curve;
step S2, determining flow distribution weights in different grids according to the land utilization type and the soil characteristic data;
step S3, determining the distribution proportion of the radial flow of different grids, and calculating the distribution proportion of all grids in the watershed according to the flow distribution weight of each grid;
and step S4, distributing the flow of the outlet section of the basin into each grid according to the distribution proportion to realize flow rasterization.
2. The soil infiltration capacity-based flow process rasterization method of claim 1 wherein in said step S2, said land use type is a water permeability factor; the soil characteristic data includes: soil structure and initial water content.
3. The soil infiltration capacity-based flow process rasterization method of claim 1 wherein in said step S2, determining flow distribution weights within different grids includes determining weights characterizing the soil infiltration capacity of different grids.
4. The soil infiltration capacity-based flow process rasterization method of claim 1, wherein in the step S3, the calculating the distribution proportion of all grids in the drainage basin according to the flow distribution weight of each grid includes:
wherein, Pi，jCharacterizing a water permeability factor of the grid (i, j); si，jCharacterizing the soil structure of grid (i, j); wi，jIs the initial moisture content of the grid (i, j); i and j respectively represent the serial numbers of the grids in the x and y directions; m and n are the total number of the grids in the x and y directions of the two-dimensional grid; PRi，jThe distribution proportion of net rainfall for different grids.
5. The soil infiltration capacity-based flow process rasterization method of claim 1 wherein in said step S4, said distributing the flow of watershed outlet sections into each grid according to distribution proportions comprises:
EPi，j＝PRi，j×NR，
among them, EPi，jA grid value representing a flow rate; NR is the flow value of the outlet section of the basin at a certain moment.
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