Method and system for evaluating mountain torrent disaster risks of villages along river based on DPSIR model

Abstract

The invention provides a method and a system for evaluating mountain torrent disaster risks of villages along river based on a DPSIR model. The evaluation method comprises the following steps: selecting indexes corresponding to a driving force factor, a pressure factor, a state factor, an influence factor and a response factor, and constructing an index system based on a DPSIR model to form an index library; screening out a preset number of indexes related to each factor from an index library, and obtaining corresponding index values and performing normalization processing; calculating the weight of the selected index; multiplying the corresponding normalized index value of the screened pressure factor, the corresponding normalized index value of the state factor, the corresponding normalized index value of the influence factor and the corresponding normalized index value of the response factor by corresponding weights respectively, and then accumulating the same kind to obtain a pressure degree P, a pressure bearing degree S, a vulnerability degree I and a loss stopping degree R; and introducing a reduction pressure bearing degree and a reduction vulnerability degree, calculatingto obtain a comprehensive evaluation risk degree, comparing the comprehensive evaluation risk degree with a preset risk level threshold value, and judging the mountain flood disaster risk level to which the village along the river belongs at present.

Description

technical field [0001] The disclosure belongs to the field of disaster risk assessment, and in particular relates to a method and system for mountain torrent disaster risk assessment of villages along a river based on a DPSIR model. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Mountain torrent disasters refer to sudden floods caused by heavy rain, snowmelt and other reasons in mountainous areas. They have the characteristics of concentrated water flow, large flow velocity, strong scouring and destructive power, and sediment and even stones in the water flow, which often cause localized floods. Due to the continuous expansion of human activities, mountain torrent disasters have occurred frequently in recent years. When a mountain torrent disaster occurs, the villages along the river that are closer to the river often bear the brunt of ...

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Problems solved by technology

[0006] In order to solve the problems of difficult selection of mountain torrent disaster indicators, difficult construction of index system, and difficult assessment of risk status in Yanhe villages, the first aspect of this disclosure provides a DPSIR model-based method for mountain torrent disaster risk assessment of Yanhe villages, which uses a new The method of selecting flash flood disaster indicators based on the above-mentioned method introduces five criterion level factor degree models, fully considers the relationship between the factor indicators of each criterion level and the effect of buffer reduction, and introduces the degree of reduction and reduction vulnerability into the comprehensive In the risk degree calculation model, five criteria layer factor degrees and comprehensive risk degrees are used to comprehensively evaluate mountain torrent disasters in villages along the river, which improves the accuracy of mountain torrent disaster risk assessment in villages along the river

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