Basin confluence simulation estimation method

Abstract

The invention relates to a basin confluence simulation estimation method. A distributed hydrological model is instructed and a basin runoff production process is simulated based on underlying surfacesand rainfall parameters. Then, the basin confluence process is simulated according to the runoff and underlying surface parameters obtained through simulation, so that confluence estimation is achieved, the space distribution difference and the time difference of the basin rainfall flood process are effectively reflected in design, and high precision is achieved for simulation of small and microbasins; in addition, rainfall flood simulation can be carried out without historical data of a hydrological station at a drainage basin outlet, the upstream catchment area drainage basin at any pointin a large-range drainage basin can be simulated, and high flexibility and practicability are achieved; meanwhile, the design method carries out simulation operation completely based on the grid calculation principle, and the operation speed is high; and the analog operation speed can be further increased by adjusting the resolution of the raster data according to application requirements, so thata large number of experiments can be performed quickly.

Description

technical field [0001] The invention relates to a method for simulating and estimating river basin confluence, and belongs to the technical field of hydrological prediction. Background technique [0002] With the development and transformation of China's sponge city construction concept, sponge city planning has begun to pay attention to the impact of watersheds around cities on urban rivers during rainfall. For mountainous and hilly areas, due to factors such as complex topography and large average slope, the runoff process formed by rainfall in the basin has the characteristics of time period and high flow intensity, which can easily cause the rapid increase of the water level of the river in the downstream urban built-up area. The rise will affect the urban rainwater drainage function and form flood disasters. Therefore, simulating the process of flow generation and confluence in small and micro watersheds in catchment areas around cities under heavy rain scenarios, as w...

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Problems solved by technology

However, this method still has problems and shortcomings. The articles by Xie Hua, Du Jinkang, etc. describe the method more generally, and only briefly describe the basic idea and conceptual flow of the method.

There is a lack of in-depth interpretation and analysis of the factor parameters and calculation formulas involved in the method, and the methods for determining the values ​​of many parameters are still unknown, making it difficult to apply the method to other watersheds and rainfall scenarios. For channel flow and slope flow, but does not give the judgment method of different units

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