2D NUMERICAL SIMULATION OF FLOOD AND FLUVIAL PROCESS IN THE MEANDERING AND ISLAND-BRAIDED MIDDLE YANGTZE RIVER  

作　　者：Yong-jun LU Zhao-yin WANG Li-qin ZUO Li-jun ZHU 

机构地区：[1]Dr., Prof., [2]Prof., Dr., Department of Hydraulic Engineering of Tsinghua University, Beijing 100084, China [3]Guaduate student [4]Serior Eingineer, Nanjing Hydraulic Research Institute, Nanjing 210029, China

出　　处：《International Journal of Sediment Research》2005年第4期333-349,共17页国际泥沙研究（英文版）

基　　金：the National Basic Research 973 Program of China(No.2003CB415206); the National Natural Science Foundation of China(Grant No.50379027); the Chinese West Communication Science and Technology Fund(2002-328-000-39).

摘　　要：The characteristics of water flow and sediment transport in a typical meandering and island-braided reach of the middle Yangtze River is investigated using a two-dimensional （2D） mathematical model. The major problems studied in the paper include the carrying capacity for suspended load, the incipient velocity and transport formula of non-uniform sediment, the thickness of the mixed layer on the riverbed, and the partitioning of bed load and suspended load. The model parameters are calibrated using extensive field data. Water surface profiles, distribution of flow velocities, riverbed deformation are verified with site measurements. The model is applied to a meandering and island-braided section of the Wakouzi-Majiazui reach in the middle Yangtze River, which is about 200 km downstream from the Three Gorges Dam, to study the training scheme of the navigation channels. The model predicts the processes of sediment deposition and fiver bed erosion, changes of flow stage and navigation conditions for the first 20 years of impoundment of the Three Gorges Project.The characteristics of water flow and sediment transport in a typical meandering and island-braided reach of the middle Yangtze River is investigated using a two-dimensional （2D） mathematical model. The major problems studied in the paper include the carrying capacity for suspended load, the incipient velocity and transport formula of non-uniform sediment, the thickness of the mixed layer on the riverbed, and the partitioning of bed load and suspended load. The model parameters are calibrated using extensive field data. Water surface profiles, distribution of flow velocities, riverbed deformation are verified with site measurements. The model is applied to a meandering and island-braided section of the Wakouzi-Majiazui reach in the middle Yangtze River, which is about 200 km downstream from the Three Gorges Dam, to study the training scheme of the navigation channels. The model predicts the processes of sediment deposition and fiver bed erosion, changes of flow stage and navigation conditions for the first 20 years of impoundment of the Three Gorges Project.

关 键 词：Yangtze River 2D mathematical model Meandering and braided channel Flow velocity Sediment transport 

分 类 号：TV122[水利工程—水文学及水资源]