人工岛工程对南黄海辐射沙脊群海域潮流泥沙影响研究

A study of impacts on tidal current and sediment concentration by artificial island projects in radial sand ridges of the South Yellow Sea

采用MIKE21二维水动力模型模拟了南黄海辐射沙脊群海域的潮流形态和含沙量,模拟结果与实测数据基本一致。在此基础上,模拟计算了围填海工程后辐射沙脊群海域的潮流和含沙量变化。结果显示工程对潮流和含沙量的影响主要出现在工程区附近。围填海工程使原本以弶港为中心呈扇形辐聚、辐散的潮流格局有所改变,形成东沙岛西侧南北向和高泥岛南侧东西向的两条潮流通道,并在一定程度上分割了条子泥南北两侧的水体。工程后含沙量的变化与平均流速的变化基本一致,在流速变大的东沙岛西北侧和高泥岛南侧海域,含沙量显著升高;在流速变小的条子泥南北两侧、东沙岛东侧及西南侧,含沙量显著降低。

The two-dimensional hydrodynamic model, MIKE21, was applied to simulate the tidal currents and sediment concentration in the radial sand ridges of the South Yellow Sea. Results were primarily consistent to observations. Then the variations of tidal currents and sediment concentration caused by the reclamation project were simulated. The results showed that the impacts were limited around the project area. After the project, the fan-shaped, Jianggang centered tidal current pattern would change to a pattern of two tidal channels, one of which locates at the west of Dongsha Island with north-south direction, and the other locates at the south of Gaoni Island with east-west direction. And Tiaozini separates waters into south one and north one to some extent. The change of sediment concentration coincides with that of current. Both the sediment concentration and the tidal current rise at the northwest of Dongsha Island and the south of Gaoni Island, while they reduce at the north and south of Tiaozini, and the east and southwest of Dongsha Island.