An Overview of Formation Mechanism and Disaster Characteristics of Post-seismic Debris Flows Triggered by Subsequent Rainstorms in Wenchuan Earthquake Extremely Stricken Areas

On July 9 2013, debris flows occurred around Longchi town with large scale and wide harm, which was a great threat to people's life and property as well as reconstruction work. Debris flow ditch in the surrounding town was studied. This paper focused on loose materials, topography and rainfall characteristics, and explored the formation mechanism of debris flow in Longchi town. The result shows that: a small catchment area in valleys also have the risk of large range of accumulation of debris flow, the debris flow is caused by a lot of loose materials in mountains after earthquake and extreme rainfall. Research results contribute to a better understanding of trigger condition of debris flow after earthquake.

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Rainfall Patterns of Post-seismic Debris Flows in the Wenchuan Earthquake Area

Earthquake-Induced Landslides ◽

10.1007/978-3-642-32238-9_97 ◽

2012 ◽

pp. 895-900 ◽

Cited By ~ 1

Author(s):

Wei Zhou ◽

Chuan Tang ◽

Chun-hua Zhou

Keyword(s):

Wenchuan Earthquake ◽

Debris Flows ◽

The Wenchuan Earthquake ◽

Rainfall Patterns ◽

Earthquake Area

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Characteristics, Hazards and Mitigation of Debris Flows Along Min River after the Wenchuan Earthquake

Earthquake-Induced Landslides ◽

10.1007/978-3-642-32238-9_106 ◽

2012 ◽

pp. 975-987 ◽

Cited By ~ 2

Author(s):

Yonggang Ge ◽

Peng Cui ◽

Xingzhang Chen ◽

Xinghua Zhu ◽

Lingzhi Xiang

Keyword(s):

Wenchuan Earthquake ◽

Debris Flows ◽

Min River ◽

The Wenchuan Earthquake

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Characteristics and Prevention of the Debris Flows following Wenchuan Earthquake in Jushui River Basin, An County, China

Journal of Earthquakes ◽

10.1155/2014/519865 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Yonggang Ge ◽

Jianqiang Zhang ◽

Xiaojun Guo

Keyword(s):

Debris Flow ◽

Wenchuan Earthquake ◽

River Basin ◽

Debris Flows ◽

Flash Flood ◽

River Channel ◽

Hazard Identification ◽

Control Mode ◽

Potential Hazard ◽

Prevention Measures

After analysing the catastrophic debris flows on August 18, 2012, and on July 9, 2013, in Jushui River basin, An County, the Wenchuan Earthquake seriously striken areas, it was found that they were characterized by the clay soil content of 0.1~1.2%, the density of 1.68~2.03 t/m3, the discharges of 62.2 m3/s to 552.5 m3/s, and the sediment delivery modulus of 1.0~9.4 × 104 m3/km2. Due to intense rainstorm, many large debris flows produced hazard chain, involved in flash flood, debris flow, dammed lake, and outburst flood, and rose Jushui River channel about 1~4 m as well as amplified flood. The hazards and losses mainly originated from the burying and scouring of debris flows, flood inundating, and river channel rise. The prevention of debris flows is facing the intractable problems including potential hazard identification, overstandard debris flow control, control constructions destructing, and river channel rapid rise. Therefore, the prevention measures for the basin, including hazard identification and risk assessment, inhabitants relocating, monitoring and alarming network establishing, emergency plans founding, and river channel renovating, and the integrated control mode for watershed based on regulating the process of debris flow discharge, were recommended for mitigation.

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