2008 Assateague Island USGS EAARL Lidar-Derived Dune Crest, Toe and Shoreline

The Storm-Induced Coastal Change Hazards component of the National Assessment of Coastal Change Hazards project focuses on understanding the magnitude and variability of extreme storm impacts on sandy beaches. Lidar-derived beach morphologic features such as dune crest, toe and shoreline help define the vulnerability of the beach to storm impacts. This dataset defines the elevation and position of the seaward-most dune crest and toe and the mean high water shoreline derived from the 2008 Assateague Island (Virginia and Maryland) USGS Experimental Advanced Airborne Research Lidar (EAARL) lidar survey. Beach width is included and is defined as the distance between the dune toe and shoreline along a cross-shore profile. The beach slope is calculated using this beach width and the elevation of the shoreline and dune toe.

全国海岸变化灾害评估项目下设的风暴诱发海岸变化灾害研究模块，旨在探究极端风暴对砂质海滩的影响强度与变异性。通过激光雷达（Lidar）反演得到的沙丘脊线、坡脚与岸线等海滩地貌特征，可用于表征海滩受风暴冲击的脆弱程度。本数据集基于2008年阿萨蒂格岛（弗吉尼亚州与马里兰州境内）的美国地质调查局（USGS）实验先进机载研究激光雷达（EAARL）扫描数据，提取得到向海侧最远端的沙丘脊线与坡脚的高程、位置，以及平均高潮位岸线。数据集同步包含海滩宽度参数，其定义为沿垂直岸线剖面测得的沙丘坡脚与岸线间的水平距离；海滩坡度则通过该海滩宽度，结合岸线与沙丘坡脚的高程计算得出。