四川龙池镇孙家沟泥石流调查研究

Investigation on Debris Flow of Sunjia Gully in Longchi Town of Sichuan Province

孙家沟泥石流位于龙池镇龙溪河左岸,为5·12汶川地震强震区内的一条典型泥石流沟谷,在2010年8月14日突降暴雨情况下暴发了泥石流灾害。通过对孙家沟泥石流流域特征的调查研究,从物源、水源、地形方面对其形成条件进行了分析,并对其流速、流量、一次固体物质冲出量等动力学参数进行了计算。采用单沟泥石流危险度评价模型对孙家沟泥石流危险度进行评价,得到其危险度为0.50,属于中度危险。

Sunjia gully, which is located on the left bank of the I_ongxi fiver in Longchi town of Sichuan province and belongs to a typical debris flow cheuch in the strong - earthquake region of ＂5 · 12 Wenchuan earthquake＂, outbroke a debris flow disaster under the condition of sudden heavy rainfall on August 14, 2010. By investigations on the basic features of Sunjia gully, the condi- tions for the formation of debris flow disaster were analyzed from the aspects of sediment source, water source and topography, and the dynamic parameters （flow velocity, flow capacity, sediment rush- out quantity, etc. ） of debris flow of Sunjia gully were calcu- lated. The evaluation model of single - gully debris flow risk degree was used to evaluate the risk degree of debris flow of Sunjia gul- ly. and the aeouired result was 0.50. belonging to the moderate risk.