北京市延庆区石窑村南地沟泥石流特征及发展趋势预测

本文以北京市延庆区石窑村南地沟泥石流为研究对象,通过野外调查与GIS统计分析,研究该流域降雨条件、地形地貌和沟道条件、物源条件等形成条件特征,针对流域内松散堆积物转换,开展了流域分区特征分析;通过14个因子分析,建立了该泥石流的发育阶段识别模型,对其发展趋势进行了预测;利用单沟泥石流堆积区公式开展了最大危险区预测研究,提出相应的防治措施建议。研究表明:石窑村南地沟泥石流内松散堆积物动储量达18.36×10~4 m~3,物源类型划分为冲洪积物源、残坡积物源、人工堆积物源和崩滑塌物源4种,其中残坡积所占比重最大。该泥石流属于暴雨-沟谷型-支沟群发型、中易发泥石流,泥石流发展阶段处于发育期,最大危险区面积为0.413 km~2,对沟口堆积区的石窑村及村民的生命财产安全造成威胁,建议采用局部物源平整与疏理排导渠相结合的综合治理措施。本文为该区地质灾害防治提供基础依据。

south gully of Shiyao village, Yanqing district, Beijing

Taking the typical debris flow gully - the south gully of Shiyao Village in Yanqing District of Beijing as the research object, through field investigation and GIS statistical analysis, the characteristics of formation conditions such as rainfall conditions, topography and landform, gully conditions and provenance conditions in the basin were studied. According to the analysis of the transformation of loose deposits in the basin, the characteristics of basin regions were analyzed. Based on the analysis of 14 factors, the identification model of the development stage of the debris flow gully is established, and the development trend of the gully is predicted. The prediction of the maximum danger area is carried out by using the formula of accumulation area of single gully debris flow, and the corresponding prevention and control measures are put forward. The results show that the dynamic reserves of loose deposits in the debris flow gully in the south gully of Shiyao Village are 18.36×104 m3, which can be divided into four kinds of supply sources, namely alluvial and diluvial source, residual slope source, artificial accumulation source and collapse source, among which the residual slope source accounts for the largest proportion. The mud-rock flow belongs to the heavy rains - valleys - te 6 group of hair debris flow gully, prone to debris flow, landslide development stages in the development period, the biggest danger zone covers an area of 0.413 km2, accumulation of mizoguchi kill implements village and threaten the life and property safety of the villagers, recommended local source level + platoon guide channel reorganization combination of comprehensive control measures, The research results provide the basis for geological hazard prevention and control in this area.