|Table of Contents|

Evaluation index selection of debris flow based on entropy value theory(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2014年02期
Page:
28-33
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Evaluation index selection of debris flow based on entropy value theory
Author(s):
WANG Ying-jie1;  WANG Lei1;  RONG Qi-guo2;  XIONG Dong3
1. School of Construction Engineering, Jilin University, Changchun 130026, Jilin, China; 2. School of Engineering, Peking University, Beijing 100871, China; 3. Department of Basic Courses, Engineering University of China Armed Police Force, Xi’an 710086, Shaanxi, China
Keywords:
debris flow;  minimum entropy analysis theory;  evaluation index;  contribution rate
PACS:
U416.165
DOI:
-
Abstract:
Aiming at solving the deficiencies of index weight determination in evaluating risk of geological disaster, the theory of minimum entropy analysis was used to form nonlinearindependent components. The index optimization and weight determination were done based on their contributions to debris flow. The index weights were evaluated in the classic debris flow risk evaluation model. The evaluation results were compared with the calculated results. Analysis result shows that the main optimal indexes are the maximum rushed amount for a debris flow, frequency, basin area, main gully length, main gully bed tortuosity coefficient, vegetation coverage, the reserve of loose solid material, basin cutting density and sediment supply length ratio. The corresponding weight values of these indexes are 0.235 3, 0.235 3, 0.079 1, 0.079 1, 0.079 1, 0.079 1, 0.073 0, 0.073 0 and 0.073 0 respectively. The numbers of extreme, heavy, moderate and slight debris flows are 3, 3, 6 and 0 respectively. The calculated results are consistent with the real situation and development trend of studied debris flow area. It proves the reasonability of minimum entropy analysis theory applied in geological disaster risk evaluation. 3 tabs, 14 refs.

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Last Update: 2014-04-30