Urban surface runoff flow direction calculation method and device based on cellular automaton

Abstract

The invention discloses an urban surface runoff flow direction calculation method and device based on a cellular automaton. The method comprises the following steps: establishing a cellular basic geographic scene of a research area; determining downstream cells of the intermediate cells according to the water level value, and calculating the time required for transferring the water quantity of theintermediate cells to each downstream cell; comparing the water level value standard deviation between the intermediate cell and the neighborhood cell with the standard deviation threshold, selectinga water quantity distribution weight value, and determining the water quantity distribution proportion in each downstream cell; comparing the time step length of the model with the actual transfer time of the water quantity, and determining the water quantity distribution proportion within one time step length; and calculating the water quantity transferred from the intermediate cell to each downstream cell according to the water quantity of the intermediate cell and the water quantity distribution proportion, setting a transfer upper limit in each downstream direction, and correcting the water quantity transferred to each downstream cell. The method is more suitable for the actual flow direction motion process, can make up for the defects of other multi-flow-direction algorithms, and improves the simulation precision of the urban confluence process.

Description

technical field [0001] The invention relates to the fields of urban hydrology and environmental science, in particular to a method and device for calculating the flow direction of urban surface runoff based on cellular automata. Background technique [0002] The urban hydrological model can realize the accurate simulation of urban rainfall and runoff process, and provide a theoretical basis for urban waterlogging warning, formulation of emergency evacuation plan for rain and flood, and prevention and control of urban non-point source pollution. The flow direction of urban surface runoff can describe the transmission and flow route of water, sediment and other surface materials from high to low between geomorphic units, and determines the calculation of important topographic and hydrological parameters such as catchment area and topographic index. plays an important role in. [0003] Flow direction algorithms are divided into two categories: single flow direction algorithms ...

AI Technical Summary

Problems solved by technology

The multi-flow direction algorithm allocates water to different downstream units according to the water allocation weight p. It is generally based on two assumptions, one is "the steeper the downstream direction, the more water is obtained", and the other is based on "the power system tends to However, the p value in the current multi-flow direction algorithm is a fixed value, ignoring the influence of terrain characteristics on the flow field division, and the simulation results are poor when the slope is steep

Images