贡嘎山东坡湾东河泥石流的特征及危险度评价  

Characteristics and Hazard Assessment of Wandong River Debris Flow on East Slope of Gongga Mountain

作　　者：佘涛[1] 谢洪[1] 王士革[1] 孔纪名[1] 刘正梁[1] 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所

出　　处：《水土保持研究》2008年第3期242-245,共4页Research of Soil and Water Conservation

基　　金：国家自然科学基金项目(40501008)

摘　　要：湾东河是大渡河上游的一条支流，流域面积170．6km2，河床比降137．5‰。通过对湾东河主河与支沟泥石流形成条件、特征进行分析得知，主河暴发低频率泥石流，一般50～100a才活动一次，流体性质以过渡性为主；支沟银厂沟和板板棚沟为中一低频率泥石流沟，中等规模的泥石流分别10-20a和20～30a发生一次，大规模和特大规模的泥石流50～100a活动一次，流体性质均为黏性泥石流。3条河（沟）均为高度危险的泥石流沟，危险度值分别为0．68，0．70和0．61。Wandong River is a tributary of the Dadu River on the upper reach,with 170. 6 km2 of basin area and 137. 5‰ of riverbed gradient. By research on formation condition,characteristic of debris flow in main river and tributaries, we know that main river often breaks out low frequency and transitional debris flow,with return period of 50~ 100 years. Debris flow happened in Yinchang Gully and Banbanpeng Gully are medium-low frequency debris flow,with return period of 10-20 years and 20-30 years for the moderate-scaled debris flows,50-100 years for the large-scaled ones. All of the debris flows in tributaries are viscous. This paper has also discussed debris flow hazard assessment in Wandong River. Yinchang Gully and Banbanpeng Gully are the high hazard debris flow gullies, with the hazard degree of 0.68,0. 70,0. 61, respectively.

关 键 词：泥石流 湾东河 形成条件 危险度 

分 类 号：P642.23[天文地球—工程地质学]