2012 Post-Hurricane Sandy Fire Island, New York 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 2012 Post-Hurricane Sandy Fire Island 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的风暴诱发海岸变化灾害子模块，聚焦于探明极端风暴对砂质海滩的影响规模与变异性。通过激光雷达（Lidar）提取的沙丘脊线、坡脚与海岸线等海滩地貌特征，可用于界定海滩抵御风暴影响的脆弱性。本数据集明确了基于2012年飓风桑迪灾后费尔岛激光雷达测绘成果获取的向海最外侧沙丘脊线与坡脚的高程、位置，以及平均高潮位海岸线。数据集涵盖海滩宽度指标，其定义为沿垂直岸线剖面测得的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以及海岸线与沙丘坡脚的高程计算得出。