|关键词: 湘江 长江 东洞庭湖 边界条件 水文 泥沙 河槽演变
|THE EVOLUTION OF XIANGJIANG RIVER LOWER REACH RIVER-BED AND THE REALIGNMENT PROPOSAL
Yu Yichang, Chen Jingshan
Geography Department, East China Normal University, Shanghai 200062
|Within the east Dongting Lake area, Xiangjiang River Lower reach flows through Bianshan and Yueyang into Changjiang River at Chenglingji. Being a river during dry season, but a lake when flooded, the flow of water, silt and the boundary conditions are so complicated that the disorder and changes of the beaches greatly affect shipping. Both Yueyang and Chenglingji are not only the north gate of Hunan Province but also the water transportation pivot which links Dongting Lake and four other rivers with Qhangjing River. Because of its important economic status, we made an on-the-spot investigation of the area. from l988 to 1990. Based on the landforms, deposit face water power and the original data of hydrology and silt from the flow sections at Bianshan, Yueyang and Chenglinigji, found that the evolution law of the river-bed — the river-bed has been moving gradually to the right; with the right branch getting deeper, the left branch is getting silted and shallower, and the river itself is getting narrower. In order to control the lie of the river and have a stable waterway, we suggest that the middle part of the right branch is dredged, mainly through the way of digging, while spur dike, underwater dike and reef explosion can be applied if necessary.
|Key words: Xiangjiang River, Changjiang River, East Dongtinig Lake, Boundary conditions, Hydrology, Silt, The evolution of the river-bed