鄱阳湖流域暴雨型泥石流形成机制与动力特征——以江西修水县卢庄沟泥石流为例

摘要

对鄱阳湖流域暴雨型泥石流形成机制与动力特征进行研究,旨在为此类山洪灾害防治及流域水工程安全提供借鉴.以江西省修水县卢庄沟暴雨型泥石流为例,通过现场调查和室内试验,对其发育特征及动力学特征进行分析.研究结果揭示该泥石流长6.25 km,流域面积4.27 km2,物源62.46万km3,主沟坡降大(524.1‰),高差约1 160 m地形易于汇水且泥石流动力足.江西省修水县卢庄沟泥石流形成机制和动力特征可总结为:暴雨-滑坡-松散堆积体搬运-老泥石流沟冲刷复活-泥石流形成.%The formation mechanism and dynamic characteristics of rainstorm-induced debris flow in Poyang lake valley of Jiangxi Province is researched, which was expected to provide a reference for this kind of mountain torrent disaster and safety of river basin water project.Through field investigation and laboratory test, Luzhuang debris flow of Huanglong County in Jiujiang City was selected as an example, and the development characteristics and kinetics characteristics were analyzed.The main channel length of the debris flow is about 6.25 km, the catchment area is 4.270 km2.The supply of source was comparatively abundant(about 62.46×104 km3), the longitudinal gradient is 524.1‰ and the height differences is 1160m, the topography is easy to catchment.The process of rainstorm-induced debris flow in the study area can be divided into 4 stages: debris flow-source formation;loose accumulation carry;older landslide resurrection and debris flow initiation.