Numerical Simulation on Waterlogging and Flooding of the Four River and the Dongting Lake
|School||Yangtze River Scientific Research|
|Course||Hydraulics and River Dynamics|
|Keywords||Drainage simulation Two - dimensional flow model Caused by floods rate Four Rivers and Dongting Lake area A two-dimensional united calculation Floods relationship|
Waterlogging occurs with high frequency , long duration , large losses , and Aioi accompanied with the floods . For a long time all over the floods in the study is limited to local experience and qualitative analysis . This thesis, numerical simulation of flow technology , combining farmland water conservancy science and engineering hydrology theory , drainage mathematical model to calculate submerged depth , causing waterlogging area caused floods rate , research outside the flood level change on drainage , and watershed drainage of flood control the impact of the situation . The model results provide the basis for the prediction and assessment of waterlogging , flood control and waterlogging planning and technical support . The thesis is divided into six chapters , each chapter is summarized as follows : The first chapter summarizes the features and research status waterlogging , pointed out the inadequacies of the drainage simulation study . Chapter II summarizes the numerical simulation of flow technology , the choice of the unstructured grid finite volume method to establish drainage model , and then take a two-dimensional linked operator , establish Flood mathematical model . Chapter simulated lake area drainage , calculated the submerged depth under different flood conditions and rainfall combination , causing waterlogging area , causing waterlogging rate study outside the flood level and drainage . Chapter IV using the the hydrology method of calculating the net Hunan Province, four water basin rain process , calculated using the average of elimination drainage flow . Chapter by a two-dimensional linking operator analog Xiang , Zi, Yuan , Li River drainage into Dongting Lake flood problem , the calculation of process of convergence export flow , four rivers and river flood bit , the flow field of the Dongting Lake water level study watershed drainage of flood control situation . Chapter VI concludes the paper , there are still problems in the analysis , and gives directions for further research in the future .