康定市桃花沟泥石流发育特征及防治对策

Analysis on Development Characteristics,Prevention and Control Measures of Debris Flow in Taohuagou Gully in Kangding

拟建大渡河猴子岩水电站某移民场址位于桃花沟沟口堆积扇上,桃花沟属于泥石流冲沟,历史上曾多次爆发泥石流并淤塞大渡河。笔者通过现场勘察,查明了桃花沟泥石流形成的地形地貌、物源和水源条件,以及当时泥石流爆发状况,阐述了泥石流发育特征和成灾机理。在此基础上,根据沟道特点,通过对泥石流基本特征参数计算分析,利用ANSYS软件旗下的CFX模拟了50 a一遇泥石流在沟口处的冲淤漫流范围,并对移民安置点的潜在影响及危险性进行分析评价,进而提出了针对性的治理措施建议。

One resettlement site of Houziyan Hydropower Station sits on the alluvial apron at the mouth of Taohuagou gully which is caused by debris flow.Debris flow happened several times in the past and silted up the Daduhe River.The author,through site investigation,identifies the topography,provenance and water source conditions of Taohuagou debris flow,as well as eruption of the debris flow at that time,and expounds the development characteristics and disaster mechanism of debris flow.On this basis,the author calculates and analyzes the basic characteristics of debris flow considering the features of the gully;scoring and silting range of debris flow at the gully mouth with a frequency of 50-year return period is simulated through CFX,a fluid numerical modelling tool owned by ANSYS.Following the analysis and assessment of risk and potential impact of debris flow on the resettlement site,suggestions on specific control and prevention measures are given in this paper.