September 2006 Mississippi and Alabama 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 2006 USGS Mississippi and Alabama 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（National Assessment of Coastal Change Hazards）下设的风暴诱发海岸变化灾害子课题，旨在探究极端风暴对沙质海滩的影响强度与变异性。通过激光雷达（LiDAR）提取的海滩地貌特征（包括沙丘脊线、沙丘坡脚与岸线），可用于表征海滩抵御风暴影响的脆弱性。本数据集基于2006年美国地质调查局（United States Geological Survey，USGS）针对密西西比州与阿拉巴马州开展的实验型先进机载研究激光雷达（Experimental Advanced Airborne Research Lidar，EAARL）勘测数据，标定了向海侧最远端沙丘脊线与沙丘坡脚的高程及位置，以及平均高潮位岸线。数据集包含海滩宽度参数，其定义为沿垂直岸线剖面上沙丘坡脚与岸线之间的水平距离。海滩坡度则通过该海滩宽度，以及岸线与沙丘坡脚的高程计算得到。