Characteristics of rainfall responsible for debris flows in Wenchuan Earthquake area

被引：29

作者：

Guo, Xiaojun ^{[1
]}

Cui, Peng ^{[1
,2
]}

Marchi, Lorenzo ^{[3
]}

Ge, Yonggang ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Hazards, Chengdu 610041, Sichuan, Peoples R China

[2] Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China

[3] CNR, IRPI, I-35127 Padua, Italy

来源：

ENVIRONMENTAL EARTH SCIENCES | 2017年 / 76卷 / 17期

关键词：

Debris flows; Inducing rainfall; Triggering rainfall intensity; Rainfall thresholds; Wenchuan Earthquake area; THRESHOLDS; LANDSLIDES; INITIATION;

D O I：

10.1007/s12665-017-6940-y

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The ability to forecast debris flows is important because of their frequent occurrence and potential for large-scale damage in the Wenchuan Earthquake-hit area. Accurate understanding of the characteristics of rainfall responsible for triggering debris flows is necessary for an effective early warning procedure. This study examined the general characteristics and spatiotemporal variation of rainfall events that responsible for debris flows. Analysis was performed on rainfall data extracted during 2008-2013. The results revealed that the rainfall thresholds for debris flows varied annually and showed tendency toward higher conditions required. The coefficient of variation of relevant rainfall events indicated that the characteristics of the rainstorms changed. In addition, the coefficient of deviation revealed the spatial variation of rainfall in subregions, which was attributed to differences of the local climatic conditions that control debris flow occurrence. The primary controlling rainfall indices for triggering debris flows were filtered, and the most suitable models for establishing rainfall thresholds were selected. Ultimately, the rainfall thresholds were obtained for each subregion within the study area.

引用

页数：16

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