Complex terrain flood inundation process simulation method based on cellular automaton

Abstract

The invention relates to a complex terrain flood inundation process simulation method based on a cellular automaton. The method comprises the steps of: obtaining data information of an area to be simulated; based on the cellular automaton model, establishing a basic geographic scene of the flood inundation process model; determining a downstream cell in each central cell neighborhood cell; calculating the flow velocity of the cells at the t moment; determining the allocation weight of each central cell i for transferring the water quantity to the downstream cell of the central cell i within the next time step [delta]t at the moment t; calculating the next time step [delta]t at the moment t, and carrying out the water transfer calculation of the cells; determining an adaptive time step [delta]t of the model; calculating the water depth and the flow velocity of the cells at the t+[delta]t moment; returning to the step 4, and continuing iteration until the simulation duration requirementis met; and completing simulation of flood inundation. Compared with the prior art, the method has the advantages of realization of real-time simulation and massive calculation simulation requirements, high precision, good stability and the like.

Description

technical field [0001] The invention relates to the technical field of flood process simulation and disaster prevention and reduction, in particular to a method for simulating flood process in complex terrain based on cellular automata. Background technique [0002] Flood disaster is one of the natural disasters with the highest frequency, the widest range of influence, and the most serious threat to human life and property in China. With the development of computer technology and geographic information technology, flood calculation and simulation technology is also improving. [0003] At present, as flood inundation calculation and simulation methods, water surface elevation calculation method and hydrodynamic model method are commonly used methods with relatively mature theory and technology. Although the water surface elevation calculation method can quickly calculate the flood inundation situation in a large area, it cannot dynamically simulate the flood inundation proc...

AI Technical Summary

Problems solved by technology

Although the water surface elevation calculation method can quickly calculate the flooding situation in a large area, it cannot dynamically simulate the flooding process

Although the hydrodynamic model method can obtain the detailed flood submersion process, it takes a long time to solve the two-dimensional hydrodynamic equation numerically

[0004] Chinese patent CN110442988B discloses a method and device for calculating urban surface runoff flow direction based on cellular automata. The parameters are used to simulate the dynamic water depth and flow velocity during the flood process, and the physical interpretability of the empirical parameters is poor

[0005] Chinese patent CN109190168A discloses a dynamic correction method for flood evolution simulation supported by real-time measurement data. This patent uses real-time measurement data to correct the flood evolution simulation results and relies on a large amount of real-time flood data (such as water level, etc.). Currently not applicable in most regions

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