›› 2013, Vol. 34 ›› Issue (5): 1409-1415.

• Geotechnical Engineering • Previous Articles     Next Articles

Screening of debris flow risk factors and risk evaluation based on rank correlation

CHEN Peng-yu1，QIAO Jing-shun2，PENG Zu-wu1，XIE Kai1，YU Hong-ming1   

  1. 1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China; 2. Faculty of Architectural Engineering, Huanghuai University, Zhumadian, Henan 463000, China
  • Received:2012-06-12 Online:2013-05-10 Published:2013-05-14

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Abstract: In view of the difference in the monotonicity for risk factors and the nonlinear relationship between the primary risk factors and secondary risk factors in the evaluation of debris flow risk, a new method to evaluate the correlation between the primary risk factors and secondary risk factors by using scatter diagrams and Spearman rank correlation is proposed. In the method, the scatter diagrams are used to analyze the relationship between the primary risk factors and the secondary risk factors, and on this basis, a preliminary screening of the secondary risk factors can be made. Spearman coefficients of rank correlations are used to further screen the secondary risk factors and identify their weights. With the new method, a new formula of debris flow risk is established by using the basic data of 37 debris flow gullies in Yunnan province. Finally, the new formula is taken to calculate the debris flow risk of 12 debris flow gullies in Dongchuan city. The results verify that the source conditions and dynamic conditions are significant to the potential risk of debris flows, so as to justify the rationality of this method.

Key words: risk degree, debris flow, monotonicity, nonlinearity, Spearman coefficient of rank correlations

CLC Number: 

  • P 694
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