Application of hydrodynamic model based on dynamic loss in the ecological water replenishment process of Yongding River
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Abstract:
In order to accurately simulate the one-dimensional hydrodynamic process, a coupled improved Kostiakov formula is proposed based on the hydrodynamic model of open channel unsteady flow. Considering that the river leakage loss is affected by the river flow and the underlying surface conditions of the river, the real flow change process under the river is simulated. By coupling the loss model and the hydrodynamic model considering the actual river water loss, the calculated flow of the hydrodynamic model is used as the flow boundary condition of the loss model at the same time step. The loss of the time step is calculated by the loss empirical parameters a and b, and the hydrodynamic river loss parameters are corrected in real time. The accuracy of the model was tested by four measured water replenishment data from 2022 to 2024 in the Yongding River basin, and the characteristics of ecological changes in the Yongding River before and after the "23·7" flood were analyzed. The model has good simulation accuracy in the lower reaches of the Yongding River, and has good applicability in different seasons and different basins. The minimum absolute value of the relative error is 0.004, and the maximum is 0.218, which is within the allowable range of error. The "23·7" flood has obvious scouring effect on the Yongding River channel, and the shape of the river channel has changed significantly. The roughness of the river channel and the infiltration loss of the river channel are reduced compared with those before the flood scouring. The lower reaches of the Yongding River can realize the water supply of the whole basin with small flow before the flood scouring, which can provide a reference for the ecological water transfer in the lower reaches of the Yongding River.
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