弯曲型感潮河口泥沙输移规律的数值模拟

Numerical Simulation of Sediment Transfer in the Curved-Shaped Tidal Estuary

应用MIKE21软件中的Flow Model FM模型,对不同上游流量、不同中值粒径条件下的弯曲型感潮河口泥沙输移规律进行了数值模拟,并通过实测资料对模型进行了验证。结果表明:弯曲型感潮河口在丰水期、中水期和枯水期的水位变化规律基本一致,不同粒径对水位的影响不是很大,潮水位起主导作用;在丰水期冲刷区域主要集中于进口段顺水流方向左侧、弯道段凹岸及出口段左岸,淤积区域主要集中于弯道段的凸岸;在中水期同一时刻对应的河床高程是出口处河床淤积、进口处河床冲刷,在枯水期同一时刻对应的河床高程则是弯道处淤积、进口处冲刷。

This paper used Flow Model FM of the MIKE 21 software to conduct numerical simulation to the curved-shaped tidal estuary underdifferent upstream traffic and different median sizes, and verified the numerical model through actually measured data, revealed the generalrules of the estuary evolution, geomorphology and tidal sediment of the curved-shaped tidal estuary, providing important grounds for estuaryimprovement projects. The simulation results show that a curved-shaped tidal estuary basically has the same changing pattern in wet seasons,normal seasons and dry seasons; different sizes have very small influence to the water level, the tidal levels plays a dominating role; in wetseasons, erosion areas are mainly concentrated in the entrance section of the left along the direction of the flow, the curve section of theconcave bank and the exit section of the left bank, the deposition areas are mainly concentrated in the curve section of the convex bank; inthe normal seasons, the bed elevations are deposited at the exit section and eroded at the entrance section in the same period; in the dryseasons, the bed elevations are deposited at the curve section and eroded at the entrance section in the same period.