Environment Fluid Dynamics Simulation To The Confluent Yangtze River And Jialing River In Chongqing

The ability to simulate and predict the transport and mixing of materials discharged into the water body is an essential element in environmental management. After the running of Three Gorges Reservoir, the reaches of Yangtze River and Jialing River in the city Chongqing become the middle and upper reach of the fluctuating backwater reach of Three Gorges Reservoir, and their hydrodynamic conditions will be changed greatly. A 3D model for the water environmental management, flood control and drinking water source safety in the reaches of Yangtze River and Jialing River in the city Chongqing is developed, and the significant work to the environmental safety has been done in this dissertation. The model constructed here is a powerful tool to study the environmental fluid dynamics of Three Gorges reservoir.The environmental fluid dynamics of Yangtze River and Jialing River in Chongqing city is the main content of this dissertation. A 3D environmental fluid dynamics model is developed. Using this model, the flow with complex topographies, complicated boundaries and a lot of nonlinear processes can be simulated accurately. The environmental problems of Yangtze River and Jialing River in Chongqing are analyzed. The text is arranged as follows: The theoretical part of numerical simulation is present in Chapters 1,2,3; and the applications of the river model are described in Chapters 4,5,6, including the channel regulation project in Xijian River, the hydrodynamic of the confluent reach of Yangtze River and Jialing River and the environmental research of the reaches of Yangtze River and Jialing River in the city Chongqing. After the successful applications of the first two models, the environmental model for the whole reaches of Yangtze River and Jialing River in the city Chongqing is developed, and based on this model, the numerical simulation of the flow field, material concentration field and drifter's motion is carried out.The main aims and methods of this dissertation are put forward in Chapter 1. The issues of river simulation are discussed, and the development of the researches about river models is reviewed.The shallow water theories and water quality models are discussed Chapter 2. Airy theory and Boussinesq theory are two kinds of the main methods. The development of more accurate and more stable computational techniques is helpful to understand and predict environmental fluid flows. Using FVM, a water quality model of Shimen reach...