Hydrodynamics flood routing analogy method based on double-deck asynchronous iteration strategy

Abstract

The invention provides a hydrodynamics flood routing analogy method based on a double-deck asynchronous iteration strategy. Grid data with the same resolution ratio as a digital elevation model are used for representing flood data, and the actual water flow process is simulated by adopting a double-deck asynchronous iterative algorithm; a flood routing moment is determined by an outer layer iteration process according to the given iterative step length, the magnitude relationship between the time used for flowing from one grid to an adjacent grid and the grid iterative step length is compared by an inner layer iteration process to determine the respective inner layer iteration step length of grids, the self-adaptive selection of iterations is thus realized, the fracture surface water yield of each grid is subjected to iterative computations, and a flood routing graph is dynamically drawn by setting a time interval of outputting a flood form. FloodArea software, a homogenization iterative algorithm and the method provided by the invention are adopted for respectively simulating storm flood historical data of Fujian province Wanan drainage basin, a result indicates that the simulative result provided by the method is highest in goodness of fit with the actual disastrous situation, and the flood routing simulation precision is effectively promoted.

Description

technical field [0001] The invention relates to a hydrodynamic flood evolution simulation method based on a double-layer asynchronous iterative strategy, and belongs to the field of virtual geographic environment research of geographic information systems. Background technique [0002] Due to the frequent occurrence, strong destructive power and unpredictability of flood disasters, simulating and forecasting the evolution of floods has become an important research task. At present, the methods for simulating and forecasting flood evolution mainly include hydrological model method, numerical simulation method, and hydrodynamic modeling method. The first two types of methods need to be based on complex mathematical models, while hydrodynamic modeling algorithms are It is relatively simple, but requires a lot of calculations, and this problem has been solved with the gradual improvement of computer performance. Therefore, the hydrodynamic flood evolution model based on GIS rast...

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Problems solved by technology

Therefore, in the interval of large time span, the uniform iterative method uses the same iterative step size to calculate the cross-sectional discharge between grid cells in an iterative process, which will inevitably affect the accuracy of flood evolution simulation

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