Decoupling method for flood inundation characteristics under multi-flood-source encountering conditions

Abstract

The invention relates to a decoupling method for flood inundation characteristics under a multi-flood-source encountering condition. According to the method, floods from different sources are adoptedto give different types of marker tracers, the migration range of the marker tracers is simulated through a hydraulic model, the inundated areas of the corresponding floods are recognized, and the influence degree of various floods in the inundated areas on the inundated water depth is analyzed. The method comprises the specific steps of finding out flood risk sources and composition of a researcharea, and formulating a flood encountering combination scheme; constructing a flood routing process simulation model; constructing a tracer agent convection-diffusion model; extracting a flood inundation range under the characteristic flood source; and analyzing the submerged water depth of the submerged area under the action of multiple flood sources. According to the method, accurate extractionof the flood arrival time under the flood encountering combination situation is achieved, the influence degree of different flood sources on the feature point positions under the flood encountering combination situation is recognized, and the flood risk map compiling precision can be improved.

Description

technical field [0001] The invention relates to a decoupling method for flood submergence characteristics of encounter conditions of multiple flood sources, and belongs to the technical fields of flood management and flood risk map compilation. Background technique [0002] The flood risk map is a series of maps that intuitively reflect the regional flood risk, including the inundation depth map, arrival time map, inundation duration map, risk avoidance transfer map, etc. It is one of the main basis for scientific flood management. Flood risk map preparation is based on accurate flood analysis results, generally through hydraulic model modeling, with a single or combined flood source as the risk source, and when designing flood control standards or exceeding standard floods, it simulates flooding in a specific area process. Under the condition of a single flood source and no internal water, the zero water depth envelope calculated by the hydraulic model is the flood inundat...

AI Technical Summary

Problems solved by technology

Under the condition of a single flood source and no internal water, the zero water depth envelope calculated by the hydraulic model is the flood inundation range; The submerged area of ​​floods from different sources will overlap in space, and due to the large submerged range of waterlogging water, the submerged range obtained by extracting the envelope range of zero water depth cannot subdivide the range and degree of influence of floods from different sources

Usually, due to the difference in flow velocity and water depth between waterlogged water and embankment-break flood, using this as a criterion to distinguish waterlogged water and embankment-break flood is the main method for multi-flood simulation flood analysis, but there are criteria thresholds that are difficult to set uniformly problem

At the same time, the influence of different flood sources on characteristic points is usually based on the analysis results of a single flood source, and the influence of different flood sources is distinguished by simple superposition. This method ignores the evolution process of various flood sources in the study area interaction, the results of decoupling do not match the actual impact of the flood

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