河口高浑浊带航道回淤影响因子分析方法研究

针对河口高浑浊带区域的航道回淤影响因子分析问题,研究提出了一套合理的分析方法。采用了理论模型计算、实测资料分析和相关性分析等技术手段,以长江口深水航道为例,计算比较了冲刷动力、淤积动力以及满足淤积条件的近底层含沙量等因子对航道回淤量的影响,并提出了满足淤积条件的小流速时近底层高含沙量是直接影响长江口高浑浊带区域航道回淤量的主要因子。这一结论通过洪枯季对应数据的差异比较得到了验证,也表明了所提分析方法的合理性。

Analysis method on influential factors to navigation channel siltation in estuary high suspended sediment concentration zone

This paper proposes an analysis method on influential factors to navigation channel siltation in estuary high suspended sediment concentration zone. For the deep navigation channel in the Yangtze River Estuary, by using theoretical model calculation, the measured data and correlation analysis, we analyze the influential factors on waterway siltation in term of scouring forces, siltation forces and the sediment concentration near bottom that meet some siltation condition. According to the analysis results, the bottom high suspended sediment concentration meeting siltation condition in low flow velocity period is the main influential factor to the siltation in navigation channel, Yangtze River Estuary. The conclusion and the analysis method are verified by correspondent data difference between the flood season and dry season.