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Mountain torrent disaster risk assessment method based on DEM

A risk assessment and disaster technology, applied in 3D modeling, image data processing, structured data retrieval, etc., can solve the problems of main factor research, failure to highlight the main factors affecting mountain torrent disasters, and inaccurate evaluation results. Accurate and reliable, avoiding the effects of human factors

Pending Publication Date: 2019-12-13
浙江仁欣环科院有限责任公司
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Problems solved by technology

[0003] In the prior art, there is a method for assessing the risk of mountain torrent disasters, such as the patent number CN201710030039.1, which is a Chinese invention patent named a multi-state system theory of mountain torrent disaster risk assessment method, but it uses rainfall, DEM, soil type , land use, population data, and socioeconomic indicators are used as evaluation factors. The selection of indicators is too broad, and the main factors affecting mountain torrent disasters have not been highlighted, and the main factors have not been studied in depth, making the final evaluation results inaccurate.

Method used

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  • Mountain torrent disaster risk assessment method based on DEM
  • Mountain torrent disaster risk assessment method based on DEM
  • Mountain torrent disaster risk assessment method based on DEM

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specific Embodiment 1

[0043] Specific embodiment one: a kind of DEM-based mountain torrent disaster risk assessment method comprises the following steps:

[0044] S1. Select the evaluation area, generally some typical mountain areas;

[0045] S2. Obtain the digital elevation model of the assessment area; generally there will be a digital elevation model taken by satellite, which can be downloaded from the Internet, such as figure 2 As shown, so this can be obtained through the existing technology, which belongs to the existing technology, so it will not be expanded in detail here;

[0046] S3. Use the ArcGIS hydrological module to analyze and apply the digital characteristics of the surface, mainly through the steps of depression filling, flow direction analysis, confluence grid calculation, watershed division and river network selection, etc., to complete the extraction of basic hydrological factors and corresponding hydrological analysis , and finally reproduce the water flow process in the for...

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Abstract

The invention relates to the technical field of disaster assessment, in particular to a mountain torrent disaster risk assessment method based on DEM. The method comprises the following steps: S1, selecting an evaluation area; S2, obtaining a digital elevation model of the evaluation area; S3, making hydrological analysis on the evaluation area digital elevation model obtained in the step 2, and watershed division of the evaluation area is obtained; S4, performing feature extraction on the watershed division obtained in the step 3 to obtain the watershed area, the maximum elevation, the minimum elevation and the watershed length of each watershed; S5, calculating the shape coefficient and the fluctuation degree of each drainage basin, and S6, obtaining a mountain torrent disaster evaluation index according to the shape coefficient and the fluctuation degree of each watershed obtained in the step 5. The evaluation method is high in evaluation result accuracy.

Description

technical field [0001] The invention relates to the technical field of disaster assessment, in particular to a DEM-based mountain torrent disaster risk assessment method. Background technique [0002] Mountain torrent disasters refer to the disasters that cause heavy losses to the national economy and people's property safety due to the sudden rise and fall of floods caused by rainfall in hilly areas, as well as the debris flows, landslides, and collapses caused by mountain torrents. Our country has a large area of ​​hills, complex natural geology and geomorphological conditions, coupled with the impact of human activities, resulting in frequent mountain torrent disasters, which seriously restrict the development of mountain managers. [0003] In the prior art, there is a method for assessing the risk of mountain torrent disasters, such as the patent number CN201710030039.1, which is a Chinese invention patent named a multi-state system theory of mountain torrent disaster ri...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/26G06F16/29G06T17/05
CPCG06Q10/0635G06Q50/26G06F16/29G06T17/05Y02A10/40
Inventor 李八辉华怀玉忻雪静
Owner 浙江仁欣环科院有限责任公司
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