|关键词: 三峡工程 冲刷 泥沙
|Prediction of river-bed scouring between Yichang and Shashi at the lower reach of the Three-Gorge Project
Chen Yuanfang1, Gao Kaichun2
1.Institure of Planning and Design of the Changjiang Waterway Bureau, Wuhan 430010;2.The Changjiang Waterway Bureau, Wuhan 430010
|Based on the existing sediment mathematical model on the river-bed scouring at the lower reach of the Three-Gorge Project (TGP), an one-dimension mathematical model on the stream load is revised and set up after analysing the characteristics of the the river course from Yichang to Shashi. The revised model reflects the quality of water regime and sand transportation in the corresponding river course. The results given predict the river-bed scouring within 20 years that the Three-Gorge Reservoir is built. In the following ten years after building the Three-Gorge Reservoir, The overburden sand layer on the river bed between Yichang and Shashi will be almost washed away, resulting in a high roughed bed. The undercutting of the garvel and pebble bed will dominate. In the 5th year and later on when the Three-Gorge Reservoir is put into operation, the slope at some local surface of the river-bed beyond Lujiahe will be seen greater, the water level at Shashi dropped more. The more apparent phenomenona will inevitably affects the conditions for shipping.
|Key words: Three-Gorge Project sediment shipping