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Characteristic screening method of key topographic factors in debris flow basin

A technology for topographic factor and feature screening, applied in instrumentation, calculation, climate change adaptation, etc., can solve problems such as difficulty in forming a unified and representative conclusion, failure to provide comprehensive effects of discriminant indicators, etc., to achieve the effect of ensuring effectiveness

Active Publication Date: 2022-06-07
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology fails to provide specific discriminant indicators and the comprehensive effect of each factor, and it is difficult to form a unified representative conclusion

Method used

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  • Characteristic screening method of key topographic factors in debris flow basin
  • Characteristic screening method of key topographic factors in debris flow basin
  • Characteristic screening method of key topographic factors in debris flow basin

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Embodiment 1

[0028] like Figure 1 to Figure 3 As shown, the method of the present invention was used to screen the key topographic factor characteristics of the debris flow basin in Liangshan Yi Autonomous Prefecture, Sichuan Province.

[0029] 1. Screen key terrain factor features

[0030] Step S1, preliminary watershed survey

[0031] Using the Digital Elevation Model (DEM), the watersheds in Liangshan Prefecture are divided, including known typical debris flow watersheds and non-debris flow watersheds ( figure 1 It is the distribution map of typical debris flow basins and non-debris flow basins in Liangshan Prefecture). Obtained the samples O=679 in the debris flow watershed, and P=512 in the non-debris flow watershed. Mark the watershed label (+1) for debris flow watershed samples and (-1) for non-debris flow watershed samples.

[0032] Step S2, extract the basin terrain factor values ​​of the two types of samples respectively

[0033]Furthermore, DEM was used to obtain 1191 samp...

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Abstract

Aiming at the defect that the prior art cannot provide specific discriminant indicators and comprehensive action effects of each factor, the present invention discloses a feature screening method for key topographical factors in a debris flow basin. This method first collects the feature set of possible key terrain factors from the debris flow watershed samples and non-debris flow watershed samples in the study area, and then establishes the Lasso penalty function to solve the optimal solution of the penalty function, and the regression coefficient corresponding to β≠0 in the optimal solution feature The feature is the selected key terrain factor feature. The invention also provides the application of the feature screening method for key topographical factors in the debris flow watershed. The method of the present invention is based on the Lasso method for comparative analysis and screening of key topographic factor features in debris flow basins, using machine learning algorithms and programs to complete quantitative analysis, and overcoming the prior art that can only qualitatively screen key topographic factor features based on statistical methods disadvantages. The principle of the method is reliable, and the accuracy of the result is high.

Description

technical field [0001] The invention relates to a method for screening terrain factor characteristics, in particular to a method for screening key terrain factor characteristics of debris flow basins different from non-debris flow basins, belonging to the fields of geological landform surveying and mapping technology and geological disaster prevention technology. Background technique [0002] Debris flow is a natural phenomenon that occurs when a watershed evolves to a certain stage. The material and energy conditions are the fundamental factors that determine its development and distribution, and the material and energy conditions are determined to the greatest extent by the topographical conditions of the watershed. Debris flow is generally a small watershed event, so the local characteristics of the watershed can have a decisive impact on the hydrological process. The materials produced by landslides and collapses in many small watersheds are often transported to the outsi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/05
CPCG06T17/05Y02A10/40
Inventor 江玉红杨红娟张少杰王凯刘道川
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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