兴化湾工程建设对周边海域水沙环境影响

基于实测水文泥沙资料,建立和验证了兴化湾海域大小嵌套的二维潮流泥沙数学模型;模型与实测结果在水动力泥沙方面吻合,验证结果良好。以兴化湾港口规划工程为例,运用所建模型分析相关工程实施对周边海域水沙环境影响。结果表明:规划工程实施后,湾内流速局部有所调整;但变化范围和幅度均相对有限。采用断面潮量计算方法,得出工程前后湾内纳潮量中潮期间减小15%,大潮期间则为13. 1%; 1个月后,湾内水体交换率均在40%以上,与天然条件相比,交换率减小了6. 8%;工程后湾内含沙量仍保持了较低的状态;同时受近岸区滩涂围垦影响,使浅海区再悬浮泥沙来源减少,导致南侧海域含沙量有所降低。研究成果为兴化湾海域科学合理的规划布局提供一定的参考。

Impacts of Xinghua Bay Construction on water and sediment environment in surrounding waters

: Based on the measured hydrological and sediment data, a two-dimensional mathematical model of tidal current and sediment in Xinghua Bay is established and validated. The model agrees well with the measured results in terms of hydrodynamic and sediment. Taking Xinghua Bay Port Planning Project as an example, the model is used to analyze the impact of related projects on water and sediment environment in the surrounding sea area. The results show that: after the implementation of the planning project, the flow velocity in the Bay has been adjusted locally, but the range and range of variation are relatively limited; the cross-section tidal volume calculation method is used to calculate the tidal volume in the bay before and after the project is reduced by 15% and the tidal volume is 13.1%; one month later, the water exchange rate in the bay is above 40%, compared with the natural conditions. The exchange rate decreased by 6.8%; the sediment concentration in the Bay remained low after the project, and the reclaimed sediment source in the shallow sea area decreased due to the reclamation of the nearshore beach. It will provide some references for scientific and rational planning of Xinghua Bay.