September 2007 Northern Gulf of Mexico 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 2007 Northern Gulf of Mexico (Mississippi and Alabama) 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.国家海岸变化灾害评估项目（National Assessment of Coastal Change Hazards project）中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。激光雷达（Lidar）反演得到的沙丘脊线、坡脚与海岸线等海滩地貌特征，可用于明确海滩抵御风暴冲击的脆弱性。本数据集基于2007年墨西哥湾北部（密西西比州与阿拉巴马州）EAARL激光雷达勘测数据，提取得到向海最外侧沙丘脊线与坡脚的高程及位置信息，以及平均高潮位海岸线。数据集包含海滩宽度参数，其定义为垂直岸线剖面上沙丘坡脚与海岸线之间的距离；海滩坡度则通过该海滩宽度，结合海岸线与沙丘坡脚的高程计算得到。