Distribution Characteristics and Geogenic Mechanisms of Riverbed Overburden in Southwest China

The distribution, scale, and engineering geological characteristics of riverbed overburden have become one the key issues in construction water conservancy hydropower projects southwest China. In this study, we summarize discuss (variation thickness) distribution geogenic (formation) mechanisms associated rivers. This was done by compiling thickness data from constructed planned dams. results show that is generally shallower upper Tibetan Plateau region, it thickest marginal mountain region middle reaches, lower reaches regions are contact with Yunnan-Guizhou or Sichuan Basin. holds true shallow-thick-shallow Distribution Law. Additionally, river has characteristic thickening gradually basin edge to plateau slope. Through genesis, source, aggradation deposits riverbed, layer explored, coupling effect tectonic-climatic-fluvial sedimentation processes on variation spatial proposed. Finally, problems encountered when dams thick analyzed, common measures put forward. provide basic support for resources exploitation further development Southwest