Refined diagnosis method for urban agglomeration area flood risk zoning

Abstract

The invention discloses a refined diagnosis method for urban agglomeration area flood risk zoning. The method comprises the following steps of using a GIS spatial data analysis function to carry out data rasterization and standardization processing on each index; constructing a judgment matrix corresponding to the index system; calculating the relative weight of each index and the flood risk degree of different grid units so that establishment of an urban agglomeration area flood risk degree evaluation model based on a fuzzy analytic hierarchy process and drawing of a flood risk map are realized. From the perspectives of rainstorm distribution characteristics, historical flood distribution characteristics, rainstorm ponding risk distribution characteristics of all cities and the like, theflood risk distribution characteristics of urban agglomeration areas are systematically diagnosed in an omnibearing and multi-angle mode. The flood risk degrees and risk levels of different dangerousareas are accurately calculated, a multi-index problem is scientifically and objectively synthesized into a single-index form, a single index capable of effectively measuring the flood risk degree isconstructed, and a reliable technical support means is provided for flood dangerous area division.

Description

technical field [0001] The invention relates to the technical field of emergency disaster prevention diagnosis, in particular to the construction of a flood risk assessment and diagnosis method. Background technique [0002] Urban agglomeration is an urban regional system formed by the spatial interaction of several densely distributed cities of different levels and their hinterlands. With the acceleration of urbanization, extreme weather occurs frequently, the area of ​​impermeable ground continues to increase, population and wealth continue to gather, and the risk of urban flood disasters is increasing, posing a great threat to people's production and life. Therefore, it is not only an important basis for urban emergency disaster prevention, but also the need for urban risk management and sustainable development to carry out flood risk zoning in urban agglomeration areas and accurately diagnose the distribution characteristics of flood risk in this area. [0003] At prese...

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Problems solved by technology

[0003] At present, there are mainly principal component analysis and analytic hierarchy process for flood risk zoning. These two methods can reflect the distribution characteristics of flood risk to a certain extent, but there are also some shortcomings. problem; AHP has the arbitrariness of subjective determination of weight

In addition, the current flood risk zoning mainly divides the evaluation units by administrative boundaries such as districts and counties. Due to the large spatial scale, it is impossible to accurately locate the flood risk.

Therefore, in order to improve the current risk zoning method and the shortcomings of large evaluation unit scales, the present invention provides a fuzzy analytic hierarchy process for fine flood risk zoning in urban agglomerations in order to accurately and objectively diagnose the flood risk characteristics of urban agglomerations , to provide a scientific basis for improving and implementing flood emergency plans and enhancing flood emergency management capabilities

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