The Influence of Intertidal Sandbar Welding on Dune Growth

潮间带沙洲焊接对沙丘生长的影响

• 批准号: 1561847
• 负责人: Peter Ruggiero
• 金额: $ 38.52万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-01 至 2019-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1561847&HistoricalAwards=false
• 关键词: Influence; Intertidal; Sandbar; Welding; Dune

This coastal geomorphology project is relevant to the large coastal populations that rely on dunes for protection during storms and it could provide useful information for coastal planners and engineers. The project aims to advance understanding of the recovery and building of coastal dunes with a focus on the welding of intertidal sandbars to the shoreline. The investigators will develop novel approaches to measure the effects of waves and wind on the movement of sand. They will communicate findings to coastal management agencies and will train one PhD student and two undergraduate students.The goal is to improve understanding of beach-dune dynamics by testing the hypothesis that sediment supply to the backshore beach and dunes is dominated by the welding of intertidal sandbars to the shoreline. While this mechanism has long been proposed as critical, only limited quantitative data exists. The investigators propose a comprehensive field experiment (SEDEX2, the Sandbar-aEolian-Dune Exchange EXperiment) in which measurements of waves and wind, subaqueous and aeolian sediment transport, and subsequent morphological changes will be collected synoptically during an intertidal bar welding event along a highly progradational beach. The findings will inform conceptual and numerical models of beach-dune interaction and help to improve management of vital backshore resources.

这一海岸地貌学项目与大量依赖沙丘保护的沿海人口有关，可以为沿海规划者和工程师提供有用的信息。该项目旨在促进对海岸沙丘恢复和建设的理解，重点关注潮间带沙洲与海岸线的焊接。研究人员将开发新的方法来测量海浪和风对沙子运动的影响。他们将把研究结果传达给海岸管理机构，并将培养一名博士生和两名本科生。目的是通过验证后海岸海滩和沙丘的沉积物供应主要由潮间带沙洲与海岸线的焊接控制的假设，提高对海滩-沙丘动力学的理解。虽然这一机制长期以来一直被认为是关键的，但只有有限的定量数据存在。研究人员提出了一个综合的野外实验（SEDEX2，沙洲-风沙-沙丘交换实验），在这个实验中，波浪和风的测量，水下和风沙的输运，以及随后的形态变化将在一个高度递进的海滩的潮间带沙洲焊接事件中被天气性地收集。这些发现将为海滩-沙丘相互作用的概念和数值模型提供信息，并有助于改善对重要的后海岸资源的管理。