Bottom-mounted instrumentation was deployed at two sites on a large sandy shoal of an ebb tidal delta offshore of the Port Royal Sound of South Carolina of USA to collect hydrodynamics and sediment dynamics data. One site (“borrow site”) was 2 km offshore in a dredge pit for nearby beach nourishment and the other site (“reference site”) was 10 km offshore. In situ time-series data were collected during two periods after the dredging: 15 March–12 June (spring) and 18 August–18 November (fall) of 2012. Data at the reference site indicated active migrating bedforms from centimeters to decimeters tall, and sediment concentrations were highly associated with semidiurnal and fortnightly tidal cycles. In the fall deployment, waves at the reference site were higher than those at the shallow borrow site. Both Tropical Storm Beryl and Hurricane Sandy formed high waves and strong currents but did not generate the greatest sediment fluxes. The two sites were at different depths and distances offshore, and waves contributed more to sediment mobility at the reference site whereas tidal forcing was the key controlling factor at the borrow site. This study provides valuable datasets for the selection of sites, prediction of pit infilling, and the modeling of storm impact in future beach nourishment and coastal restoration projects.

中文翻译：

---

潮汐和风暴对高潮潮汐三角洲水动力和泥沙动力学的影响

底部安装的仪器部署在美国南卡罗来纳州皇家港附近一个潮汐带三角洲的大型沙质浅滩的两个位置，以收集水动力和泥沙动力学数据。一个地点（“借用地点”）在疏edge坑中离岸2公里，用于附近的海滩营养，而另一个地点（“参考地点”）离岸10公里。在挖泥后的两个阶段中收集了现场时间序列数据：2012年3月15日至6月12日（春季）和8月18日至11月18日（秋季）。参考地点的数据显示活跃的迁移床形从几厘米高到几分米，沉积物浓度与半日和每两周潮汐周期高度相关。在秋季部署中，参考站点处的波浪要比浅层借用站点的波浪高。热带风暴绿柱石和飓风桑迪都形成了高浪和强流，但没有产生最大的泥沙通量。这两个地点离岸的深度和距离不同，并且波浪对基准地点的泥沙运动有更大的贡献，而潮汐强迫是取水地点的关键控制因素。这项研究提供了有价值的数据集，可用于选址，预测坑的充填以及在未来的海滩养料和海岸恢复项目中模拟风暴影响。