Modeling and evaluation method of urban waterlogging in heavy rain

Abstract

The invention relates to the technical field of prediction of weather states, and especially relates to a modeling evaluation method for urban heavy rain inundation. The method includes the following steps: (1), establishing a to-be-evaluated area into a digital elevation model, and dividing the model into grids; (2), generating a river network, establishing a river network on the digital elevation model, and determining the current direction and speed of a basin; (3) determining inundated areas, the grids the river flows across being river grids and other grids being ground grids, determining initial river grids and inundation conditions, and successively determining, from the initial river grids, whether the ground grids adjacent the river grids meet inundation conditions, wherein the ground grids are inundated grids if the conditions are satisfied, otherwise, the ground grids are not inundated grids; (4) determining the inundation critical rainfall; (5) determining inundation calamity risks; and (6) evaluating inundation risks. Through adoption of the method, the inundation coverage, the inundation depth, the inundation risks and losses or the like can be predicated before heavy rain, early warning is carried out timely, property losses are minimized, and personal safety is guaranteed.

Description

technical field [0001] The invention relates to the technical field of predicting weather conditions, in particular to a method for modeling and evaluating urban waterlogging in rainstorms. Background technique [0002] In recent years, with the rapid development of urban construction and the increase of strong convective weather, urban waterlogging has shown some new characteristics, and the phenomenon of traffic jams, river spread, and geological disasters caused by it has increased significantly. Urban construction and industry disaster prevention work face new challenges. To this end, it is necessary to carry out in-depth and detailed risk assessment research according to the new disaster characteristics of urban waterlogging, establish a scientific and standardized rainstorm urban waterlogging and lightning damage risk assessment system, and use the assessment results to guide production management departments at all levels to carry out targeted measures. Disaster prev...

AI Technical Summary

Problems solved by technology

However, the current model of urban waterlogging caused by heavy rain disasters is mainly based on surface runoff and hydrodynamics. For the meteorological department, waterlogging caused by heavy rains focuses on the early warning and risk judgment of waterlogging disasters. With the assessment The improvement of requirements has put forward higher requirements for the fineness of assessment, the way of spatial expression, and timeliness. Traditional methods and technologies cannot meet the needs, and the existing methods can only make simple estimates of rainfall and water level. , it is impossible to calculate the risk, loss and damage area brought by the rainstorm, which leads to insufficient preparation of people in the early stage of the rainstorm, resulting in a large number of personal accidents and property losses

Images