CN-121997824-A - Hydrologic-hydrodynamic-water quality coupling simulation method and system

CN121997824ACN 121997824 ACN121997824 ACN 121997824ACN-121997824-A

Abstract

The invention relates to the technical field of hydrologic water resource and hydrodynamics intersection, in particular to a hydrologic-hydrodynamic-water quality coupling simulation method and system. The method comprises the steps of obtaining hydrologic basic data, constructing a hydrologic model based on the hydrologic basic data, constructing a hydrodynamic model based on a preset two-dimensional shallow water equation, setting coupling parameters, setting a first simulation time and a total simulation time, operating the hydrologic model in the first simulation time and the initial coupling time step by using the hydrologic model in the preset self time step, and outputting the flow process of the outlet section of the river basin. The invention realizes high-precision simulation of the river basin flood process based on hydrologic water resource and hydrodynamic crossing technology, and ensures the space-time precision of the simulation result through self-adaptive coupling step length and water level feedback.

Inventors

PING YANG
HU YUYING
XU HAO
ZHANG ZHENZHOU
ZHANG WEI
YU JINGWEN
SONG LIXIANG
CHEN RENJING
Liang Binrui
YI SHENGZE

Assignees

珠江水利委员会珠江水利科学研究院
中电建生态环境集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260122

Claims (10)

1. The hydrologic-hydrodynamic-water quality coupling simulation method is characterized by comprising the following steps of: Step S1, acquiring hydrologic basic data, constructing a hydrologic model based on the hydrologic basic data, constructing a hydrodynamic model based on a preset two-dimensional shallow water equation, and setting coupling parameters, wherein the coupling parameters comprise an initial coupling time step, a water level error threshold value and an internal time step of the hydrodynamic model; step S2, setting a first simulation time and a total simulation time length, and operating at a preset time step by utilizing a hydrological model in the first simulation time and an initial coupling time step to output a flow process of the outlet section of the river basin; S3, converting the flow process of the outlet section of the river basin into the boundary condition of the inlet of the hydrodynamic model; Step S4, in the first simulation time and the initial coupling time step, the hydrodynamic model operates in the internal time step of the hydrodynamic model, and receives the boundary condition of the hydrodynamic model inlet so as to calculate the water level; And S5, performing coupling time step self-adaptive adjustment according to the water level, the current river channel water level and the water level error threshold value to obtain second simulation time, outputting space-time distribution data if the second simulation time is smaller than or equal to the total simulation time length, and evaluating the simulation precision of the space-time distribution data by adopting Nash efficiency coefficients.
2. The hydrologic-hydrodynamic-water quality coupling simulation method according to claim 1, wherein constructing a hydrologic model based on hydrologic basic data in step S1 includes: The method comprises the steps of extracting rainfall capacity and runoff curve number based on hydrologic basic data, calculating the net rain depth of a river basin by adopting an SCS-CN runoff producing formula, and calculating outlet section flow according to the net rain depth of the river basin combined with a unit line method so as to construct a hydrologic model; wherein, SCS-CN generates the flow formula as follows: ; ; Wherein, the Net rain depth (mm) for the basin; the number of the runoff curves is the number of the runoff curves; As a potential maximum amount of water to be stored, Is the rainfall.
3. The hydrographic-hydrodynamic-water quality coupling simulation method according to claim 2, wherein calculating the outlet section flow according to the watershed net rain depth combined unit line method comprises: Determining an effective rainfall area according to the net rainfall depth of the drainage basin, dividing the effective rainfall area into a plurality of sub-drainage basins, and establishing a unit line response function for the plurality of sub-drainage basins; And accumulating the flow contribution amounts of the sub-drainage areas to determine the flow of the outlet section.
4. A hydrographic-hydrodynamic-water quality coupling simulation method according to claim 3, wherein determining an effective rainfall area according to a net rain depth of a basin comprises: setting a net rain depth threshold, and determining a drainage basin grid unit corresponding to the net rain depth of the drainage basin as an effective rainfall grid unit when the net rain depth of the drainage basin is larger than the net rain depth threshold; Grid clustering is performed based on the effective rainfall grid cells to determine effective rainfall areas.
5. The hydrologic-hydrodynamic-water quality coupling simulation method according to claim 1, wherein the two-dimensional shallow water equation preset in step S1 is specifically: ; ; ; Wherein, the Is water depth% ); Is that Flow velocity in direction [ (] ); Is that Flow velocity in direction [ (] ); Acceleration of gravity ); Is that Directional friction gradient; Is that Directional friction gradient; Is that A directional bottom slope; Is that A directional bottom slope; Is that Directional surface stress [ ] ); Is that Directional surface stress [ ] )。
6. The hydrographic-hydrodynamic-water quality coupling simulation method according to claim 1, wherein setting the coupling parameters in step S1 includes: Setting coupling parameters including an initial coupling time step, a water level error threshold and a hydrodynamic model internal time step, wherein the hydrodynamic model internal time step is determined by CFL conditions, and the CFL conditions are as follows: Wherein, the Is the mesh size; The internal time step of the hydrodynamic model; Acceleration of gravity ); Is water depth% ); Is that Flow velocity in direction [ (] ); Is that Flow velocity in direction [ (] )。
7. The hydrographic-hydrodynamic-water quality coupling simulation method according to claim 1, wherein step S3 further comprises: if the river channel water level at the current moment is greater than or equal to the preset critical water level, the hydrologic model production flow is regulated through a water level-production flow correction coefficient, wherein the water level-production flow correction coefficient has the following calculation formula: ; Wherein, the Correcting the coefficient for the water level-current; is a preset critical water level; The current river channel water level; Is the first analog time.
8. The hydrographic-hydrodynamic-water quality coupling simulation method according to claim 1, wherein the step S5 of performing the coupling time step adaptive adjustment according to the water level, the current time river water level and the water level error threshold value, to obtain the second simulation time comprises: subtracting the current river channel water level from the water level to obtain a water level error; Multiplying the initial coupling time step by 0.5 if the water level error is greater than the water level error threshold, multiplying the initial coupling time step by 2 if the water level error is less than the water level error threshold, and maintaining the current initial coupling time step if the water level error is equal to the water level error threshold; And executing constraint condition check on the adjusted initial coupling time step length, and outputting the initial coupling time step length to obtain second simulation time.
9. The hydrographic-hydrodynamic-water quality coupling simulation method according to claim 1, wherein the nash efficiency coefficient in step S5 includes: ; Wherein, the In order to observe the value of the value, In order to be an analog value, In order to observe the average value of the values, For the nash efficiency coefficient, Indicating good simulation results.
10. A hydrographic-hydrodynamic-water quality coupling simulation system for performing the hydrographic-hydrodynamic-water quality coupling simulation method of claim 1, the hydrographic-hydrodynamic-water quality coupling simulation system comprising: the model initialization module is used for acquiring hydrologic basic data, constructing a hydrologic model based on the hydrologic basic data, constructing a hydrodynamic model based on a preset two-dimensional shallow water equation, setting coupling parameters, wherein the coupling parameters comprise an initial coupling time step, a water level error threshold value and an internal time step of the hydrodynamic model; The model calculation module is used for setting a first simulation time and a total simulation time length, and outputting a river basin outlet section flow process by utilizing a hydrologic model to run in a preset time step within the first simulation time and an initial coupling time step; the forward driving and reverse feedback module is used for converting the flow process of the outlet section of the river basin into the boundary condition of the inlet of the hydrodynamic model; The water level module is used for running the hydrodynamic model at the internal time step of the hydrodynamic model in the first simulation time and the initial coupling time step and receiving the boundary condition of the hydrodynamic model inlet so as to calculate the water level; The visualization module is used for executing the self-adaptive adjustment of the coupling time step length according to the water level, the current river channel water level and the water level error threshold value to obtain second simulation time, outputting space-time distribution data if the second simulation time is smaller than or equal to the total simulation time length, and evaluating the simulation precision of the space-time distribution data by adopting Nash efficiency coefficients.

Description

Hydrologic-hydrodynamic-water quality coupling simulation method and system Technical Field The invention relates to the technical field of hydrologic water resource and hydrodynamics intersection, in particular to a hydrologic-hydrodynamic-water quality coupling simulation method and system. Background The hydrologic model focuses on describing the basin confluence process, and the hydrodynamic model focuses on simulating the water flow and the material transportation, but a single model is difficult to simultaneously meet the coupling requirement of macroscopic confluence-microscopic hydrodynamic process. The loose coupling method realizes independent operation and result interaction of the submodels through a data interface, has the advantages of strong model compatibility and low development cost, but the traditional loose coupling has the defects that ① static time step coupling adopts a fixed time interval (such as 1 hour) to exchange data, so that the boundary condition of the output of the hydrologic model lags behind the dynamic change of the hydrologic model, ② unidirectional driving is mainly that the hydrologic model unidirectional provides inflow to the hydrologic model, feedback of a hydrodynamic process (such as water level jacking) to an upstream hydrologic process is ignored, ③ data interaction efficiency is low, data transmission is realized by relying on file reading and writing, instantaneity is poor, and the simulation requirements of dynamic scenes such as burst floods and the like are difficult to meet. Disclosure of Invention Accordingly, the present invention is directed to a hydrographic-hydrodynamic-water quality coupling simulation method and system, which solve at least one of the above-mentioned problems. In order to achieve the above purpose, a hydrologic-hydrodynamic-water quality coupling simulation method comprises the following steps: Step S1, acquiring hydrologic basic data, constructing a hydrologic model based on the hydrologic basic data, constructing a hydrodynamic model based on a preset two-dimensional shallow water equation, and setting coupling parameters, wherein the coupling parameters comprise an initial coupling time step, a water level error threshold value and an internal time step of the hydrodynamic model; step S2, setting a first simulation time and a total simulation time length, and operating at a preset time step by utilizing a hydrological model in the first simulation time and an initial coupling time step to output a flow process of the outlet section of the river basin; S3, converting the flow process of the outlet section of the river basin into the boundary condition of the inlet of the hydrodynamic model; Step S4, in the first simulation time and the initial coupling time step, the hydrodynamic model operates in the internal time step of the hydrodynamic model, and receives the boundary condition of the hydrodynamic model inlet so as to calculate the water level; And S5, performing coupling time step self-adaptive adjustment according to the water level, the current river channel water level and the water level error threshold value to obtain second simulation time, outputting space-time distribution data if the second simulation time is smaller than or equal to the total simulation time length, and evaluating the simulation precision of the space-time distribution data by adopting Nash efficiency coefficients. Preferably, the present specification further provides a hydrographic-hydrodynamic-water quality coupling simulation system for performing the hydrographic-hydrodynamic-water quality coupling simulation method as described above, the hydrographic-hydrodynamic-water quality coupling simulation system comprising: the model initialization module is used for acquiring hydrologic basic data, constructing a hydrologic model based on the hydrologic basic data, constructing a hydrodynamic model based on a preset two-dimensional shallow water equation, setting coupling parameters, wherein the coupling parameters comprise an initial coupling time step, a water level error threshold value and an internal time step of the hydrodynamic model; The model calculation module is used for setting a first simulation time and a total simulation time length, and outputting a river basin outlet section flow process by utilizing a hydrologic model to run in a preset time step within the first simulation time and an initial coupling time step; the forward driving and reverse feedback module is used for converting the flow process of the outlet section of the river basin into the boundary condition of the inlet of the hydrodynamic model; The water level module is used for running the hydrodynamic model at the internal time step of the hydrodynamic model in the first simulation time and the initial coupling time step and receiving the boundary condition of the hydrodynamic model inlet so as to calculate the water level; The visualization module is used for executin