Large-scale typhoon flood simulation and calculation method

Abstract

The invention discloses a large-scale typhoon flood simulation and calculation method. The method comprises the following steps of firstly, generalizing a grid into an upper-layer soil aquifer and a lower-layer soil aquifer by using the spatial data sets, such as landform, soil texture, land utilization, etc., as a basis for model calculation based on a grid distributed hydrological simulation method; considering the rainfall, evaporation, excess infiltration runoff, full storage runoff, soil lateral flow and drainage water flow towards an underground aquifer on each grid, wherein the lateral flow comprises the lateral flow flowing into the grid from the upstream grid, the lateral flow flowing to the downstream grid from the grid and the groundwater runoff; on the basis of runoff production calculation, adopting an improved kinematic wave backflow calculation method to carry out simulation calculation on the backflow of a slope and a river channel. According to the method, in the large-scale typhoon flood simulation calculation, high calculation efficiency and certain accuracy are displayed, and the problem of balance between accuracy and timeliness is solved.

Description

technical field [0001] The invention belongs to the technical field of hydrological simulation and prediction, and relates to a large-scale typhoon flood simulation calculation method. Background technique [0002] Distributed hydrological model is an effective means to study the process and mechanism of water cycle, and it is also an effective tool to solve many practical hydrological problems. [0003] The time-space variable source mixed runoff model firstly divides the geomorphological and hydrological response units based on the multi-source spatio-temporal data (data sources) in small watersheds, and constructs the corresponding runoff mechanisms of different response units; Flow model (method source), using the combined concept reservoir method to simulate the soil water exchange between the aerated zone and the saturated zone (divided water source); constructing space-time from three aspects of super-percolation / full storage plane mixing, vertical mixing and time-per...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the optimization balance between accuracy and timeliness cannot be achieved in large-scale typhoon flood simulation, the present invention provides a large-scale typhoon flood simulation calculation method, firstly based on the improved distributed time-space variable source mixed runoff calculation method, simulate runoff on each calculation grid, and then use the improved kinematic wave calculation method to simulate the flow movement between grids to obtain the flow rate of each simulated grid in the typhoon flood event

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