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Method and device for grading flood risk

A risk level, flood disaster technology, applied in the level field, can solve the problems of unconsidered, high data requirements, low level of technical business, and achieve the effect of increasing the frequency of monitoring

Inactive Publication Date: 2013-07-24
MIN OF CIVIL AFFAIRS NAT DISASTER REDUCTION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flood risk index calculated by this method has a strong physical meaning, but the disadvantage is that it requires high data
[0026] At present, the defects of the regional flood disaster risk assessment technology mainly include: 1) The differences in the disaster mechanism of flood disasters on different spatial scales are not considered, which leads to the poor applicability of the technology; 2) The design of the risk assessment model During the process, the availability of model input data was not considered, resulting in a low degree of commercialization of the technology

Method used

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  • Method and device for grading flood risk
  • Method and device for grading flood risk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] According to the analysis of the flood risk assessment model, combined with the existing basic geographic data, meteorological data and the results provided by upstream products, considering the availability of data, in the flood risk assessment of each level, the rainfall data, terrain data, river and lake data were selected. Factors such as distribution data, land use type, soil type, vegetation coverage, and water conservancy facilities are used as risk evaluation indicators, and statistical data such as population and economy are used as vulnerability indicators, and are determined by expert scoring method and analytic hierarchy process. The weight of each evaluation index is used to determine the risk level of flood disaster, and on this basis, the risk level of flood disaster is divided.

[0096] The invention provides a method for classifying flood risk levels, such as figure 1 As shown, the method includes:

[0097] S1. By selecting the precipitation index, riv...

Embodiment 2

[0148] This example provides a national waterlogging risk assessment method based on grading, which specifically includes the following aspects:

[0149] 1) Design ideas

[0150] The model selects rainfall index, terrain index and water network density index as evaluation factors to calculate the risk evaluation factors of national flood disasters through the method of grading and grading, and calculates the risk index of flood disasters nationwide; by selecting the population The density index and economic GDP index are used as evaluation factors to calculate the vulnerability evaluation factors of flood disasters, and the nationwide vulnerability index is calculated; then the risk index and vulnerability index are combined to generate a nationwide flood disaster risk index, Then divide and generate flood disaster risk level.

[0151] 2) Index selection

[0152] According to the previous analysis of the risk and vulnerability of flood disasters, combined with the needs of l...

Embodiment 3

[0182] This example illustrates the regional (watershed / province) waterlogging risk assessment method based on grading, which is specifically divided into the following aspects:

[0183] 1) Design ideas

[0184]The model selects rainfall index, terrain index, water network density index, and hydraulic engineering index as evaluation factors to calculate the risk evaluation factors of waterlogging in the area (watershed, province) through the method of grading and grading, and calculates the waterlogging index Risk index; by selecting population density index and economic GDP index as evaluation factors to calculate the vulnerability evaluation factor of waterlogging disaster, calculate the vulnerability index within the scope of the region (watershed, province); and then integrate the risk index and vulnerability Index, generate the waterlogging risk index within the scope of the region (watershed, province), and then divide and generate the waterlogging risk level.

[0185] ...

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Abstract

The invention provides a method for grading flood risk according to a plurality of space scales. Under each space scale, the method comprises the following steps of: S1, calculating a flood risk index by taking a precipitation amount index, a river-lake index and a terrain index as risk evaluating factors of flood; S2, calculating a vulnerability index after calculating vulnerability evaluating factors of the flood by taking a population density index and an economic GDP (Gross Domestic Product) density index as evaluating factors; and S3, generating a flood risk index by synthesizing the risk index and the vulnerability index, and further grading the flood risk index to generate a flood risk level. The method is implemented in a sequence from larger space scales to smaller space scales. Due to the adoption of the method for grading the flood risk, areas with social and economic damages possibly caused by flood disaster phenomena and risk levels can be analyzed on different space scales, and the monitoring frequency of highly-risky areas is increased.

Description

technical field [0001] The invention relates to the technical field of flood disaster risk control, in particular to a method and device for classifying flood risk levels. Background technique [0002] Flood is a hydrological phenomenon with a large peak height and a sharp rise in river water level. It is the product of changes in the natural environment system, and its occurrence and development are affected and restricted by the natural environment system. Floods bring disasters to human beings and form flood disasters. [0003] Flood Disaster mainly refers to the flood caused by the abnormal and irregular movement of atmospheric precipitation, which brings losses and disasters to the normal life and production of human beings. From the perspective of disaster science, flood disaster is a disaster-causing factor—flood, in a certain disaster-forming environment, acts on the disaster situation formed by the disaster-bearing body. The generation of flood disaster depends on ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 杨思全聂娟范一大胡卓玮崔燕和海霞王平
Owner MIN OF CIVIL AFFAIRS NAT DISASTER REDUCTION CENT
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