Abstract
A Case Study of Debris Flow Hazards in the Bayi Gully, Sichuan Province, China
Highlights
Debris flows are ubiquitous hazards in mountain areas
On August 13, 2010 heavy rainfall occurred in the Longxi River catchment, the maximum rainfall intensity in one hour was 75.0 mm, the cumulative rainfall was 229 mm and the duration of debris flow was 1 hour 40 min
We suggest that the initiation of debris flows in the Xiaowan gully started with significant surface washed and ditch erosion
Summary
Numerous debris flows were triggered in the earthquake-affected area. During the period between the Wenchuan earthquake and September 2009, several debris flows occurred in Bayi gully on May 14 and May 19,2008 and July 17, 2009. Total volume of debris flow is approximately 1.14×106 m3 [2,3], caused 2 persons were missing,230 persons were injured and 40 houses buried. The total volume of the debris flow deposits was 3.34×106m3. The large volume deposits silted in the watercourse, 1150m long, average 80m wide, average 12 m thick, the maximum thickness was more than 15 m, and of 116×104 m3 total debris flow volume [5]. The study attempts to find a partial answer to some questions regarding the activity, triggering thresholds and magnitude of debris flows in the earthquake-affected areas. It will help to get a better understanding of the generation of postearthquake debris flows
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