钱塘江河口段长周期泥沙冲淤和河床变形

通过对钱塘江河口段50多年连续水下地形资料的整理和分析,给出了该河口段在遭遇连续丰、枯水文年时的长周期泥沙冲淤特点,以及相应塑造的顺直、弯曲两种河势在河床形态与演变上的差异。研究结果认为,长周期泥沙冲淤和河床变形是钱塘江河口段保持冲淤平衡的一种自动调整手段;与冲积河流不同的是,钱塘江河口段通过河型、比降、断面等因素的调整来改变进入该河口段潮流量的大小。

Long-term sediment erosion/deposition and deformation of river-bed in the Qiantangjiang River Estuary

According to the analysis of long series of riverbed topography data in the Qiantangjiang River Estuary,long-term sediment erosion/deposition characteristic in the Qiantangjiang River Estuary for continuous high and low water years are given,and differences in river profile and fluvial process between curve shape river and straight shape river correspond to continuous high and low water years are described.Long-term sediment erosion/deposition and deformation of riverbed are considered as a kind of Estuary's auto-adjust function to keep equilibrium in the Qiantangjiang River Estuary.Differing from the alluvial river,Estuary's autoadjust function adjusts the tidal inflow in the estuary by adjusting the river shape,the slope and the cross section.