连云港埒子口海域潮动力特征及其变化

为研究连云港埒子口海域潮流动力特征及其对周边海岸工程的响应,以及为治理埒子口闸下淤积问题提供参考,建立了基于有限体积法离散二维浅水方程的数值模型。采用实测水文资料对模型率定和验证,应用模型分析埒子口潮流动力特征和建设徐圩港防波堤和灌河口导堤后埒子口海域潮流动力的变化。模拟结果表明,建设工程后潮流动力变化较大,埒子口海域涨急流和落急流方向改变,涨、落潮平均流速均减小,距离工程区域越近,流速变化越大。埒子口海域潮流动力减弱将会加重上游挡潮闸的闸下淤积问题,致使埒子口排水不畅,进而增加沂北地区的洪涝风险,所以,相关部门应及时采取措施,保证埒子口排涝畅通。

Dynamic Characteristics and Changes of Tidal Current in the Liezikou Sea Area, Lianyungang

In order to study the dynamic characteristics of the tidal current and its response to the surrounding coastal engineering in the Liezikou sea area, Lianyungang and to provide a reference for controlling the siltation under the Liezikou gate, a numerical model is established based on the finite volume method for two-dimensional shallow water equations and then calibrated and verified by using measured hydrological data. By using this model the dynamic characteristics of the tidal current in the Liezikou sea area and its changes after constructing the breakwater at Xuwei Port and the guide levee at Guanhe River mouth are analyzed. The simulation results indicate that the change of the tidal current dynamics is significant after the engineering constructions, which include changes in the direction of rising and falling currents and the decreases in the average velocity of both rising and falling currents, being the nearer the distance away from the engineering area the greater the change in current velocity. The weakening of tidal current power will aggravate the siltation under the upstream tide gate, which will make the drainage become poor in the Liezikou area and the flood risk increase in the Yibei region. Therefore, the relevant departments should take measures timely to ensure the drainage is smooth in the Liezikou area.