The Influence of Intertidal Sandbar Welding on Dune Growth

这一沿海地貌项目与依赖沙丘在风暴期间提供保护的大量沿海人口有关，它可以为沿海规划者和工程师提供有用的信息。该项目旨在促进对沿海沙丘恢复和建造的了解，重点是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。他们将向海岸管理机构传达研究结果，并将培训一名博士生和两名本科生。他们的目标是通过检验这样一种假设，即向后岸海滩和沙丘提供沉积物的过程是由潮间带沙洲与海岸线的焊接决定的，从而提高对海滩-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，但目前只有有限的定量数据存在。研究人员提出了一个全面的现场实验(SEDEX2，沙洲-风沙-沙丘交换实验)，在该实验中，将在沿高度进积的海滩发生潮间带沙洲焊接事件期间，同步收集海浪和风、水下和风沙沉积物输送以及随后的形态变化的测量结果。这些发现将为海滩-沙丘相互作用的概念和数字模型提供信息，并有助于改善对重要后岸资源的管理。

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.