Author(s): Guo Hongwei
Linked Author(s):
Keywords: Dam break; Flood routing; Mathematical model; Prediction
Abstract: On the basis of precious researches[1～3], a mathematical model developed by the authors to simulate the gradual process of earth-fill dam break due to overflow and flood routing downstream is described in this paper. Considering both erosion and sloughing of the breach side slope due to instability, the model may simulate the process of gradual erosion of earth-fill dam by inputting such physical parameters as the median particle diameter, cohesion, angle of internal friction and porosity of the construction material of the dam body as well as the initial breach dimension. Then the model applies complete unsteady hydrodynamic equation to route the breach outflow. Having discussed the basic mechanism of overflow dam breach, an engineering application with the model presented herein is reported. The results are shown in the figures and tables, which demonstrates the practicability of the gradual dam break model. It is believed that the model presented in this paper can give a prediction on dam break and flood routing and provide a scientific basis for flood control decision making. In the meanwhile, this case study also shows that the gradual dam-break model is more actual than that based on assumption that the final dimensions of the breach may be specified in advance of simulation and the breach will develop linearly from the initial to the final dimensions specified.
Year: 2001