长江口北槽潮波对地形变化的响应研究

以长江口北槽为研究背景，建立了二维潮流数学模型，在模型验证良好的基础上，研究了北槽潮波传播对工程与地形变化的响应。研究表明，长江口深水航道治理工程完成后，北槽地形未发生调整前，北槽潮波高、低潮位均升高，潮差减小，涨、落潮相位明显滞后，潮波变形加剧，涨落急流速均呈增大趋势；北槽水深增加后，高、低潮位随之降低，潮差增大，落潮相位略有提前，涨潮相位变化相对较小，潮波变形逐渐趋缓，涨急流速减弱，落急流速增强。

Response of tide waves in north channel of Yangtze estuary to topographic variation

Based on the numerical simulation of tide waves along the north channel of the Yangtze estuary, a 2D tidal current mathematical model is established to study the tidal wave variation in the Yangtze estuary under the conditions of topographic changes. The research results show that after the completion of the Yangtze estuary deepwater channel regulation works, the high and low tidal levels in the north channel increase, and the tidal range decreases; at the same time, there is a remarkable lag of phase of the flood tide and ebb tide, an intensive deformation of the tidal waves, and the maximum flood and ebb currents increase after the north channel terrain remains unchanged. When the water depth of the north channel increases, the high and low tidal levels in the north channel fall down, and the tidal range increases, and there is a slight phase leading of the ebb tidal level. The increase in water depth along the north channel has gradually slowed down the deformation of the tidal waves, and as a result of the regulation works, the maximum flood tide velocities decrease and the maximum ebb velocities increase.