Bathymetric Contours within the inner shelf of Long Bay, South Carolina (CON_1M, 1 meter interval: Polyline shapefile)

In 1999, the U.S. Geological Survey (USGS), in partnership with the South Carolina Sea Grant Consortium, began a study to investigate processes affecting shoreline change along the northern coast of South Carolina, focusing on the Grand Strand region. Previous work along the U.S. Atlantic coast shows that the structure and composition of older geologic strata located seaward of the coast heavily influences the coastal behavior of areas with limited sediment supply, such as the Grand Strand. By defining this geologic framework and identifying the transport pathways and sinks of sediment, geoscientists are developing conceptual models of the present-day physical processes shaping the South Carolina coast. The primary objectives of this research effort are: 1) to provide a regional synthesis of the shallow geologic framework underlying the coastal upland, shoreface and inner continental shelf, and define its role in coastal evolution and modern beach behavior; 2) to identify and model the physical processes affecting coastal ocean circulation and sediment transport, and to define their role in shaping the modern shoreline; and 3) to identify sediment sources and transport pathways; leading to construction of a regional sediment budget.

1999年，美国地质调查局（U.S. Geological Survey, USGS）与南卡罗来纳州海洋资助联合体（South Carolina Sea Grant Consortium）合作启动一项研究，旨在探究影响南卡罗来纳州北部海岸（重点聚焦大滩区（Grand Strand））海岸线变化的作用机制。此前针对美国大西洋沿岸开展的相关研究表明，分布于海岸向海一侧的古老地质地层的结构与组成，会对沉积物供给有限的区域（如大滩区）的海岸动力行为产生显著控制作用。通过明确该区域的地质框架并识别沉积物的输运路径与沉积汇，地球科学家正构建塑造现今南卡罗来纳州海岸的现代物理过程的概念模型。本研究的三大核心目标如下：1. 对海岸高地、临滨带（shoreface）及内陆架之上的浅层地质框架开展区域综合研究，明确其在海岸演化与现代海滩动态中的作用；2. 识别并模拟影响沿海海洋环流与沉积物输运的物理过程，阐明其在塑造现代海岸线中的功能；3. 识别沉积物源区与输运路径，进而构建区域沉积物收支平衡模型。