长江口深水航道三维泥沙数值模型相关问题探讨

基于近年来长江口三维水沙盐数值模型及水沙运动机理的研究进展,系统梳理了在长江口实际应用中面临的若干理论和技术难题,其中包括长江口物质输运模拟计算格式的守恒性和稳定性、河口区域河床切应力的准确计算、拦门沙区域近底高浓度泥沙形成机理及数值模型模拟、长江口近底高浓度泥沙横向入槽模式等问题,通过对于上述问题的梳理和总结,表明在长江口这类巨型河口进行三维水沙盐数值模型和水沙机理研究的复杂性,并针对此类区域的模型技术研发和水沙运动理论研究,提出了有科学意义和研究价值的方向和思路。

A review on the three-dimensional numerical model of flow, sediment and salinity and the movement mechanism in Yangtze estuary

Based on the development of 3D numerical models of flow, sediment and salinity and the movement mechanism in recent years, some theoretical and technical problems of models used for the Yangtze estuary are discussed systematically, including the problem of conservation and stability of the simulation scheme for the transport of materials in the Yangtze estuary, the estimation error and influence of the bed shear stress near the bottom, the simulation technology about the formation mechanism of high concentrations at the near bottom in the Yangtze river, and the influence of the cross-transport of the sediment near the bottom in the deep water channel of the Yangtze estuary. The results indicate the complexity and difficulty of the three-dimensional numerical model of the Yangtze estuary. Some important directions and ideas for solving these problems and further researches of model technology and movement mechanism of flow, sediment and salinity in this kind of area are suggested.