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Particle filter assimilation method, device and computing equipment for a hydrodynamic model
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A particle filter, hydrodynamic technology, applied in computer-aided design, calculation, design optimization/simulation, etc., can solve problems such as poor accuracy and reliability
Active Publication Date: 2021-04-27
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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[0005] In view of this, the present invention provides a particle filter assimilation method, device and computing equipment of a hydrodynamic model to solve the problem of poor accuracy and reliability of the output results of the current hydrodynamic model
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Embodiment 1
[0053] figure 1 A flow chart of the steps of a particle filter assimilation method for a hydrodynamic model provided by an embodiment of the present invention.
[0054] refer to figure 1 As shown, the particle filter assimilation method provided in this embodiment is used to optimize the hydrodynamic model, which specifically includes the following steps:
[0055] S1. Collect the calculation parameters of the research area, and set the grid size and boundary conditions of the inflow and outflow of the research area.
[0056] The calculation parameters here include the bottom elevation of the study area, boundary inflow flow, initial water level, initial flow and other data.
[0057] Take the Toce River hydrodynamic model as an example. The Toce River hydrodynamic model is a hydrodynamic model established on a scale of 1:100 for the upper reaches of the Toce River in Milan, Italy, within about 5 km. As a standard model, it is often used to test the accuracy and stability of ...
Embodiment 2
[0097] Figure 7 A structural block diagram of a particle filter assimilation device for a hydrodynamic model provided by an embodiment of the present invention.
[0098] refer to Figure 7 As shown, the particle filter assimilation device provided in this embodiment is used to optimize the hydrodynamic model, specifically including a parameter acquisition module 10, a first particle sampling module 20, a model output module 30, a condition judgment module 40, and a first calculation module 50 , the second calculation module 60 , the second particle sampling module 70 and the particle set replacement module 80 .
[0099] The parameter collection module is used to collect calculation parameters of the study area, and set the grid size and boundary conditions of the inflow and outflow of the study area.
[0100] The calculation parameters here include the bottom elevation of the study area, boundary inflow flow, initial water level, initial flow and other data.
[0101] Take ...
Embodiment 3
[0140] This embodiment provides a computing device, the technical device is provided with the particle filter assimilation device provided in the previous embodiment, the device is used to collect the calculation parameters of the research area, and set the size and access of the grid in the research area Flow boundary conditions; according to the water level, flow rate and preset roughness coefficient of all grids at the current moment, multiple particles with equal weights are generated to obtain a particle set; the water flow state and model roughness contained in each particle in the particle set are used respectively coefficient, and at the same time use the inflow and outflow boundary conditions to drive the hydrodynamic model sequentially to realize the update of the simulated water level and simulated flow output by the hydrodynamic model from the current moment to the next moment; judge whether there is a water level observation value in the simulated water level at the...
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Abstract
The invention provides a particle filter assimilation method, device and calculation equipment of a hydrodynamic model, specifically collecting calculation parameters of the research area, and setting the size of the grid of the research area and boundary conditions of inflow and outflow; according to the parameters at the current moment Generate multiple particles with equal weights; respectively use the water flow state and model roughness coefficient contained in each particle, and simultaneously use the boundary conditions of the inflow and outflow to drive the hydrodynamic model sequentially, so as to realize the output of the hydrodynamic model from the current moment to the next moment. Update; calculate the likelihood function value of each particle at the next moment, and update the weight of the particle; calculate the optimal estimate of the simulated water level, simulated flow rate and preset roughness coefficient. Since the spatio-temporal variability of the roughness coefficient is considered in this scheme, the accuracy and reliability of the output results of the hydrodynamic model can be higher, and the optimal estimation of the state variables and roughness coefficients in different spaces can be accurately obtained, improving The accuracy and reliability of the output results of the hydrodynamic model are improved.
Description
technical field [0001] The invention relates to the technical field of water conservancy, in particular to a particle filter assimilation method, device and computing equipment for a hydrodynamic model. Background technique [0002] The hydrodynamic model is an important tool for simulating the state of water movement in lakes, rivers, and coasts. It can effectively support management decisions and is widely used in dam break flow simulation, flood forecasting, and water quality simulation and prediction. In practice, it is often difficult to accurately measure the water terrain and inflow and outflow data required for hydrodynamic model modeling. In addition, the roughness coefficient, an important parameter that characterizes the degree of roughness in the hydrodynamic model, cannot be directly measured and the grid is discrete and the model structure The errors caused by such factors lead to uncertainty in the output results of the hydrodynamic model, which reduces the ac...
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