云南本屋宅箐泥石流沟特征及危险性评价

文章以云龙县宝丰乡福利村本屋宅箐泥石流沟为研究对象,在现场实地调查的基础上,阐述泥石流沟特征、类型、成因、发展趋势,并对该泥石流沟的危险性进行了评价。该泥石流的形成受地质、地形、气象水文及人类活动等综合因素的影响,前期降雨使固体物质分散汇入沟床积累,属于崩塌+滑坡型、沟谷泥石型、中型、高频、发展期稀性泥石流。目前,福利村本屋宅箐流域固体物源丰富,降雨集中,水源充沛,溯源侵蚀作用强烈,物源区滑坡、沟岸坍塌发育,谷坡稳定性差,泥石流的发展有增强趋势。本次采用成都山地所刘希林于1996年提出的单沟泥石流危险度评价方法对该泥石流沟的危险性进行评价,单沟泥石流危险度H单=0604,按照分级标准,福利村本屋宅箐泥石流沟属高度危险泥石流沟。

Characteristics and hazard assessment of the debris flow gully in the mansion of the welfare house inBaofeng Township, Yunlong County, Yunlong County,Yunnan

Based on the field investigation, the characteristics, types, causes and development trend of debris flow gully in Baofeng Township of Yunlong County are expounded, and the risk of debris flow gully is evaluated. The formation of the debris flow is affected by geological, topographic, meteorological and hydrological factors and human activities. Previous rainfall makes solid materials disperse into the gully bed and accumulate. It belongs to the type of collapse + landslide, gully debris flow, medium-sized, high-frequency and sparse debris flow in the development period. At present, there are abundant solid material sources, concentrated rainfall, abundant water sources, strong traceability erosion, landslides and bank collapse in the source area, poor stability of valley slope, and the development of debris flow. The single gully debris flow risk assessment method proposed by Liu Xilin of Chengdu Mountain Institute in 1996 was used to evaluate the risk of the single gully debris flow gully. The single gully debris flow risk H single = 0.604. According to the classification criteria, the house of Welfare Village is a high risk debris flow gully.