Abstract
Reservoir bank collapse, as a typical geological hazard, severely affects the geomorphic evolution and safety of residential sites. In this study, a case of Tankeng Reservoir, which is a large reservoir in eastern China is used to analyze a three-dimensional evolution mechanism and deformation characteristics of reservoir bank collapse by years of field investigation, underwater topography measurements and monitoring and corresponding physical modeling experiment. The results show that 90% of the bank collapsed within six years, and a full collapse occurred within nine years for the coarse-grained soil bank. In addition, a three-dimensional progressive pattern for the bank collapse evolution process and a new parameter of stable angles were proposed for first time, and this parameter has practical significance for further scientific calculations of the width and length of bank collapse.
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