Urban inland flooding hazard risk evaluation method

Abstract

The invention discloses a method for assessing the risk of urban waterlogging disasters, comprising the following steps: S1: distinguishing and determining the vulnerability index of urban waterlogging disasters; S2: determining the risk indicators of urban waterlogging disasters; S3: establishing a city based on a fuzzy evaluation method Waterlogging disaster risk assessment model; S4: Apply the assessment model obtained in step S3 to assess the urban waterlogging disaster, and determine the degree of danger and risk level of the disaster. The evaluation result of the invention is closer to the actual situation, can be widely applied to disaster management, disaster early warning, emergency rescue and the like, and has important significance for urban disaster prevention and mitigation.

Description

technical field [0001] The invention relates to a waterlogging disaster risk assessment method, in particular to a city waterlogging disaster risk assessment method. Background technique [0002] Floods have become the most frequent natural disasters in the world, and the casualties and economic losses caused by floods occupy the main part in various natural disasters. In recent years, the frequency of waterlogging disasters in cities has become higher and higher. Urban waterlogging disasters are mostly natural disasters caused by excessive rainfall due to heavy rain or long-term rainfall, low-lying terrain, and a large amount of accumulated water that cannot be removed in time. On the one hand, as the density of urban roads and buildings increases, the urban impermeable area and proportion increase, coupled with the destruction of surface vegetation, resulting in increased surface runoff, shortened confluence time, and increased peak flow in rivers under the same level of r...

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Problems solved by technology

The evaluation methods mainly include: the probability statistics method based on the historical disaster situation, which is to conduct statistical analysis on the disaster, find out its development law, and give early warning to the urban waterlogging disaster, but the required time series disaster data are difficult to obtain or are lost. The result is the overall risk of the region and cannot reflect the spatial difference of risk; the disaster assessment method using the indicator system generally starts from the factors of the constituent elements and selects indicators based on certain principles. It has obvious static characteristics, but it cannot effectively solve the problem of risk. Spatio-temporal variability; and based on numerical simulation technology, the hydrological and hydrodynamic model is established to simulate the flood evolution process. Although it can reflect the spatio-temporal characteristics of the flood, it lacks the risk analysis process

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