长江口深水航道治理工程不同阶段北槽丁坝群坝田泥沙冲淤分析

Characteristics of sediment erosion and deposition of field between spur dikes at different engineering phases of the Yangtze Estuary deep waterway

根据长江口深水航道治理工程不同阶段的地形分析,定量分析不同工程阶段影响下北槽丁坝群坝田冲淤厚度以及地形变化。结果表明:在不同的工程阶段,北槽南北侧坝田冲淤差异受工程进度影响,总体呈逐年淤积趋势,南北侧坝田呈"洪季多淤、枯季少淤积"的状态,北侧坝田淤积厚度大于南侧。北槽主槽与坝田地形变化在2010年之前变化较大,2010年之后,主槽基本趋于稳定,变化较缓,坝田则持续淤积。

Based on the topographic data of different project stages of the Yangtze estuary deep waterwayproject,this paper quantitatively analyzes the scouring and deposition thickness of field in the north-channel spurdikes.Analyzing the differences between the north and south field of spur dikes in different stages affected by theprogress of the project,we know that it deposits annually,more in the flood season and less in the dry season;thedeposition thickness on the north side is more than that on the south side.The terrain changes of main channel andspur dikes fields are great before2010,and the main channel tends to be stable,with a slow change,while the damcontinues depositing after2010.