The geological conditions in the upper reaches of the Jinsha River on the southeastern margin of the Qinghai–Tibet Plateau are extremely complex. Many paleo-landslides and lacustrine sediments were formed in this area under the synergistic effect of tectonic activity and climate. The study of old deposits is helpful for understanding paleoenvironment, paleoclimate, and river geomorphology evolution. This study addressed the Wangdalong landslide damming event as the object and implemented a detailed on-site investigation. The geological characteristics of the landslide body, sliding surface, source area, and lacustrine deposits are determined. The 3D topographic restoration and the SFLOW software were used to simulate landslide dynamics, and the geomorphological evolution sequence of the Wangdalong landslide is proposed. Based on the landslide dating, the mineral analysis of lacustrine sediments, and the numerical simulation, the landslide was determined to be the product of the synergistic effect of climate and structure, and an earthquake or a heavy rainfall was the most probable triggering factor of the landslide. This study established a systematic analysis of the landslide damming event, which has reference significance for similar research.

青藏高原东南缘金沙江上游地质条件极为复杂。在构造活动和气候的协同作用下，该地区形成了许多古滑坡和湖相沉积。对古沉积物的研究有助于认识古环境、古气候和河流地貌演化。本研究以王大龙滑坡筑坝事件为对象，进行了详细的现场调查。确定了滑坡体、滑动面、源区和湖相沉积的地质特征。采用3D地形复原和SFLOW软件模拟滑坡动力学，提出了王大龙滑坡的地貌演化序列。根据滑坡测年、湖相沉积物矿物分析和数值模拟，确定滑坡是气候和结构协同作用的产物，地震或强降雨是最可能的触发因素。滑坡。本研究建立了对滑坡筑坝事件的系统分析，对类似研究具有参考意义。