In order to enrich the materials for studying the landslides dam and dammed sediments in the Dadu River Basin. The newly discovered the Hetaoping landslide dam in the middle reaches of the Dadu River was studied. The landslide characteristics, the weir depositional characteristics of the river blockage formation and the landslide formation mechanism were studied through detailed field geological investigations and profiling methods. The field investigation results are as follows. The Hetaoping landslide dam plane area of 2.5 km², the total volume of about 400×10⁴ m³. The phase change characteristics exhibite vertically in the weir depositional profile reflect that the weir has undergone the evolutionary process of formation, deposition and outburst, and that the landslide has locally occurred multi-phase sliding characteristics. The formation mechanism of the Hetaoping landslide dam is divided into four stages, that is unloading rebound stage → dumping deformation stage → dumping expansion fracture stage → landslide formation plug river stage.

dadu river  /  hetaoping  /  landslide dam  /  dammed sedimentation  /  formation mechanism