River flow calculation method

By constructing a one-dimensional river hydrodynamic numerical model, combining the discontinuous finite element method and the Runge-Kutta time-discrete shallow water equations, and combining the ENO slope limiter and the HLL Riemann solver, the problem of large calculation errors in interval tributaries was solved by using the iterative method to adjust the tributary flow, thus achieving high-precision river flow calculation.

CN120951660APending Publication Date: 2025-11-14CHINA YANGTZE POWER
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Patent Information

Application Number
CN202511058161.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-30
Publication Date
2025-11-14

AI Technical Summary

Technical Problem

Existing technologies suffer from large calculation errors in tributaries within river channels during flow calculations. This causes the flow calculations to deviate from reality, reducing the accuracy of the calculations and failing to meet the needs of real-time flood management.

Method used

A one-dimensional hydrodynamic numerical model of the river channel was constructed based on the discontinuous finite element method and the Runge-Kutta time-discrete shallow water equations. The tributary flow was adjusted by an iterative method using an inherently non-oscillating ENO slope limiter and an HLL Riemann solver until the error between the simulated outlet flow and the actual outlet flow reached the preset accuracy.

Benefits of technology

It achieves high-precision flow calculations under different tributary confluence scenarios, improves the accuracy and reliability of simulation results, adapts to various complex flow conditions and tributary confluence scenarios, and enhances the stability and generalization ability of the model.

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Abstract

The invention relates to the technical field of hydrographic survey, in particular to a riverway water flow calculation method, which comprises the following steps: acquiring topographic data, hydrological data and roughness data, and constructing a one-dimensional riverway hydrodynamic numerical model; the one-dimensional river channel hydrodynamic numerical model is based on a discontinuous finite element method and a Runge-Kutta time discrete shallow water equation set, and a numerical flux is solved by combining an essential oscillation-free ENO slope limiter and an HLL Riemann solver; aiming at the confluence situation of tributaries in different intervals, the interval flow is calculated by utilizing an iterative method, including initially assuming that the tributary flow is zero, simulating non-tributary outflow by using a one-dimensional river hydrodynamic numerical model, determining the difference between the simulated non-tributary outflow and actual site flow measurement, and adjusting the tributary flow; and iteration is repeated until the error between the simulated outlet flow and the actual outlet flow reaches the preset precision. By constructing a one-dimensional river water power numerical model based on a Runge-Kutta time discrete shallow water equation set, high-precision simulation of river water flow calculation under the condition of branch flow convergence in different intervals is realized.
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