Tracing Sediment Dispersal on Nourished Beaches: Two Case Studies
Tracing Sediment Dispersal on Nourished Beaches: Two Case Studies
复制标题
追踪营养海滩上的沉积物扩散：两个案例研究
DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. Harris
中科院分区：
文献类型：
--
作者：
E. Thieler;P. Gayes;W. C. Schwab;M. Harris
事件到十年规模的模式，沉积物分散在两个人工滋养的海滩已被映射使用的地球物理调查，紧密间隔的vibracores，并重复海滩配置文件的组合。在这两个Wrightsville海滩，NC和愚蠢的岛，SC的沉积物用于海滩营养是宏观上不同的原生沉积物，可用于确定沉积物的运输途径和推断跨货架运输机制。这两个地点的数据表明，大量的营养沉积物正在向海洋输送到内大陆架。这种运输的时间和空间尺度对于营养海滩的规划、设计和长期维护具有工程意义。引言很少有研究探讨的命运海滩营养项目（国家研究理事会1995年）。相反，大多数营养海滩演变的研究都从连续海岸线位置或海滩剖面的形态变化推断出沉积物输运（例如，Hanson 1989; Kraus和Wise 1993），或者基于技术和轶事数据的组合（例如，伦纳德等人，1990年; Ebersole等人，1996年; Houston 1996年; Pilkey等人，1996年）。由于各种各样的原因，从营养沉积物的岩相学相似性和1）地质学家，美国地质调查局，384伍兹霍尔路，伍兹霍尔，MA 025431598美国。rthieler@usgs.gov卡罗莱纳海岸大学海洋和湿地研究中心教授兼主任。Box 261954，Conway，SC 29528-6054 USA. ptgayes@coastal.edu美国地质调查局地球物理学家，地址：384伍兹霍尔路，伍兹霍尔，MA 025431598 USA。bschwab@usgs.gov卡罗莱纳海岸大学海洋与湿地研究中心海洋科学助理教授。Box 261954，Conway，SC 29528-6054 USA. msharris@coastal.edu
The eventto decade-scale patterns of sediment dispersal on two artificially nourished beaches have been mapped using a combination of geophysical surveys, closely-spaced vibracores, and repeated beach profiles. At both Wrightsville Beach, NC and Folly Island, SC the sediment used for beach nourishment is macroscopically distinct from native sediment and can be used to identify sediment transport pathways and infer mechanisms for across-shelf transport. The data from both sites demonstrate that significant quantities of nourishment sediment are being transported seaward onto the inner continental shelf. The time and space scales of this transport are of engineering interest for the planning, design and long-term maintenance of nourished beaches. INTRODUCTION Very few studies have examined the fate of beach nourishment projects (National Research Council 1995). Rather, most studies of nourished beach evolution have inferred sediment transport from morphologic changes in sequential shoreline positions or beach profiles (e.g., Hanson 1989; Kraus and Wise 1993), or been based on a combination of technical and anecdotal data (e.g., Leonard et al. 1990; Ebersole et al. 1996; Houston 1996; Pilkey et al. 1996). For a wide variety of reasons, ranging from the petrographic similarity of nourishment sediment and 1) Geologist, U.S. Geological Survey, 384 Woods Hole Road, Woods Hole, MA 025431598 USA. rthieler@usgs.gov 2) Professor and Director, Center for Marine and Wetland Studies, Coastal Carolina University, P.O. Box 261954, Conway, SC 29528-6054 USA. ptgayes@coastal.edu 3) Geophysicist, U.S. Geological Survey, 384 Woods Hole Road, Woods Hole, MA 025431598 USA. bschwab@usgs.gov 4) Assistant Professor of Marine Science, Center for Marine and Wetland Studies, Coastal Carolina University, P.O. Box 261954, Conway, SC 29528-6054 USA. msharris@coastal.edu