CN110686861A - Net rainfall grid format conversion method based on four-way elevation difference - Google Patents
Net rainfall grid format conversion method based on four-way elevation difference Download PDFInfo
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- CN110686861A CN110686861A CN201911016711.7A CN201911016711A CN110686861A CN 110686861 A CN110686861 A CN 110686861A CN 201911016711 A CN201911016711 A CN 201911016711A CN 110686861 A CN110686861 A CN 110686861A
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Abstract
The invention provides a net rainfall grid format conversion method based on a four-way elevation difference, which comprises the following steps: step S1, calculating the sum of elevation differences of each grid in four directions, and setting weight according to the sum of the elevation differences; step S2, calculating the distribution proportion of net rainfall of different grids according to the calculated weight of each grid; and step S3, converting the net rainfall data of the drainage basin into a grid format according to the calculated distribution proportion of the rainfall, and distributing the net rainfall data into each specific grid. The method can solve the problem of terrain space heterogeneity faced by the hydrological data downscaling process.
Description
Technical Field
The invention relates to the technical field of hydrological data downscaling, in particular to a net rainfall grid format conversion method based on a four-way elevation difference.
Background
The coupling of hydrologic and hydrodynamic predictions is one of the hot problems in hydrologic research. The coupling process is that a hydrological model is used for forecasting/simulating the river basin production confluence, then a two-dimensional hydrodynamics model is used for forecasting/simulating the river basin flood process, namely the hydrological model is used for simulating the production confluence process, and the production flow calculates the net rainfall (rainfall-infiltration-evapotranspiration) of the previous rainfall in the river basin; and then, simulating the earth surface flood evolution process by using the hydrodynamic model, wherein the hydrodynamic model can finely describe the terrain change and the characteristics of earth surface buildings based on the grid data, so that the net rainfall obtained by simulating the hydrological model needs to be rasterized in the application and is converted into grid format data which can be used by the two-dimensional hydrodynamic model. However, at present, there is no mature method for converting the drainage basin net rainfall into the grid format, and the common method is to equally distribute the net rainfall to the drainage basin, and the method has the disadvantages that the spatial heterogeneity on the drainage basin terrain is not considered, which directly causes a large error in the two-dimensional calculation and causes poor stability of the calculation.
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 net rainfall grid format conversion method based on the four-way elevation difference.
In order to achieve the above object, an embodiment of the present invention provides a net rainfall grid format method based on a four-way elevation difference, including the following steps:
step S1, calculating the sum of elevation differences of each grid in four directions, and setting weight according to the sum of the elevation differences;
step S2, calculating the distribution proportion of net rainfall of different grids according to the calculated weight of each grid;
and step S3, converting the net rainfall data of the drainage basin into a grid format according to the calculated distribution proportion of the rainfall, and distributing the net rainfall data into each specific grid.
Further, in the step S1, the sum of the elevation differences of each grid in the four directions is calculated by using the digital elevation model DEM.
Further, in the step S1, the calculating the weight according to the sum of the elevation differences includes:
when the sum of the calculated elevation differences is larger than 0, setting the weight as the sum of the elevation differences;
and when the sum of the calculated elevation differences is less than 0, setting the weight to 0.
Further, in the step S1, calculating the weight using the following formula includes:
wherein, Wi，jIs a grid (Weight of i, j); i and j respectively represent the serial numbers of the grids in the x and y directions; z is a radical of0Is the elevation within the current computational grid; z is a radical ofk(k ═ 1,2,3,4) is the elevation of the adjacent four directional grids.
Further, in step S2, the calculating the distribution ratio of the net rainfall for the different grids includes:
wherein, Wi，jIs the weight of 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; pi，jThe distribution proportion of net rainfall for different grids.
Further, in step S3, the converting the net rainfall data of the drainage basin into a grid format and allocating the grid format to each specific grid includes:
WGi，j＝WE×Pi，j，
wherein, WGi，jA grid value representing net rainfall; WE is the basin net rainfall at a certain time.
According to the net rainfall grid format method based on the four-way elevation difference, the influence of the elevation difference in the four directions on the convergence process is fully considered during net rainfall distribution, the convergence mechanism of drainage basin production and the physical mechanism of hydrological process are fully considered, the problem of calculation errors caused by the traditional average distribution method is solved, and the calculation process is simple, easy to operate and easy to popularize.
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 net rainfall to grid format method based on four-way elevation difference in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of a square regular grid according to an embodiment of the 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.
The invention provides a net rainfall grid format conversion method based on a four-way elevation difference, which can solve the problem of heterogeneity of a terrain space when hydrologic data is downscaled.
As shown in fig. 1, the method for converting net rainfall into grid format based on four-way elevation difference in the embodiment of the present invention includes the following steps:
and step S1, calculating the sum of the elevation differences of each grid in four directions, and setting weight according to the sum of the elevation differences.
In this step, the sum of the Elevation differences of each grid in four directions is calculated by using a Digital Elevation Model (DEM).
In an embodiment of the present invention, the sum of the elevation differences in four directions of each grid is calculated based on the square regular grid described in fig. 2.
Calculating the weight according to the sum of the elevation differences, comprising the following steps:
(1) when the sum of the calculated elevation differences is larger than 0, setting the weight as the sum of the elevation differences;
(2) and when the sum of the calculated elevation differences is less than 0, setting the weight to 0.
In an embodiment of the present invention, the weights are calculated using the following formula, including:
wherein, Wi，jIs the weight of grid (i, j); i, j represent the grid x, y directions respectivelyThe serial number of (2); z is a radical of0Is the elevation within the current computational grid; z is a radical ofk(k ═ 1,2,3,4) is the elevation of the adjacent four directional grids.
And step S2, calculating the distribution proportion of net rainfall of different grids according to the calculated weight of each grid.
In this step, calculating the distribution proportion of net rainfall of different grids includes:
wherein, Wi，jIs the weight of 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; pi，jThe distribution proportion of net rainfall for different grids.
And step S3, converting the net rainfall data of the drainage basin into a grid format according to the calculated distribution proportion of the rainfall, and distributing the net rainfall data into each specific grid.
Specifically, converting the net rainfall data of the drainage basin into a grid format, and distributing the net rainfall data into each specific grid, includes:
WGi，j＝WE×Pi，j，
wherein, WGi，jA grid value representing net rainfall; WE is the basin net rainfall at a certain time.
According to the net rainfall grid format method based on the four-way elevation difference, the influence of the elevation difference in the four directions on the convergence process is fully considered during net rainfall distribution, the convergence mechanism of drainage basin production and the physical mechanism of hydrological process are fully considered, the problem of calculation errors caused by the traditional average distribution method is solved, and the calculation process is simple, easy to operate and easy to popularize.
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 (6)
1. A net rainfall grid format conversion method based on four-way elevation difference is characterized by comprising the following steps:
step S1, calculating the sum of elevation differences of each grid in four directions, and setting weight according to the sum of the elevation differences;
step S2, calculating the distribution proportion of net rainfall of different grids according to the calculated weight of each grid;
and step S3, converting the net rainfall data of the drainage basin into a grid format according to the calculated distribution proportion of the rainfall, and distributing the net rainfall data into each specific grid.
2. The net rainfall to grid format method based on four-way elevation difference of claim 1 wherein in step S1, the sum of the elevation difference in four directions for each grid is calculated using a digital elevation model DEM.
3. The net rainfall grid format method based on the four-way elevation difference as claimed in claim 1, wherein said calculating the weight according to the sum of the elevation differences in said step S1 comprises the steps of:
when the sum of the calculated elevation differences is larger than 0, setting the weight as the sum of the elevation differences;
and when the sum of the calculated elevation differences is less than 0, setting the weight to 0.
4. The net rainfall grid format method based on the four-way difference in elevation as claimed in claim 1 or claim 3, wherein in said step S1, calculating the weights using the following formula comprises:
wherein, Wi，jIs the weight of grid (i, j); i and j respectively represent the serial numbers of the grids in the x and y directions; z is a radical of0Is the elevation within the current computational grid; z is a radical ofk(k ═ 1,2,3,4) is the elevation of the adjacent four directional grids.
5. The method according to claim 1, wherein the step S2 of calculating the distribution ratio of net rainfall for different grids comprises:
wherein, Wi，jIs the weight of 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; pi，jThe distribution proportion of net rainfall for different grids.
6. The method according to claim 1, wherein the step S3 of converting the net rainfall data of the watershed into the grid format is distributed into each specific grid, and comprises:
WGi，j＝WE×pi，j，
wherein, WGi，jA grid value representing net rainfall; WE is the basin net rainfall at a certain time.
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| CN112699336A (en) * | 2021-01-07 | 2021-04-23 | 中国科学院地理科学与资源研究所 | Surface runoff watershed space discretization method and device based on eight-direction elevation difference |
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