长江河口盐水入侵对大通枯季径流量变化的响应时间

应用河口海岸三维数值模式, 计算区域包括大通至长江河口及其邻近海域, 设计高分辨率网格, 数值模拟和分析不同潮型下长江河口盐水入侵对大通径流量变化的响应时间。计算结果表明, 不同潮型期间大通径流量的增加, 河口盐度响应的时间在4.0～6.2 d之间, 但小潮期的响应时间明显长于其他潮型期的响应时间。本文给出了长江河口盐水入侵对大通枯季径流量变化的响应时间, 可为河口水文、泥沙和环境等研究中取何时径流量提供了依据。

The response time of saltwater intrusion in the Changjiang River Estuary to the change of river discharge in dry season

Based on the 3D numerical model with high resolution grid, the response time of saltwater intrusion in the Changjiang Estuary to the change of river discharge at Datong in different tidal pattern is studied. The calculated domain of the model includes the lower reaches of the Changjiang River from Datong to the Changjiang Estuary and its adjacent sea. The results show that the time response of saltwater intrusion to the increasing river discharge at Datong in different tidal pattern is 4.0 to 6.2 days, and is obvious longer in neap tide than the one in other tidal pattern. The response time of saltwater intrusion to the river discharge change in dry season was solved in this paper, which can be as a scientific reference when the river discharge should be used in the studies of hydrology, sediment and environment in the Changjiang Estuary.