2012 Pre-Hurricane Sandy Fire Island National Seashore, USGS 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 New York USGS 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中的风暴诱发海岸变化灾害研究组成部分，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、沙丘坡脚与海岸线等海滩地貌特征，可用于表征海滩对风暴影响的脆弱性。本数据集基于2012年飓风桑迪过后纽约地区美国地质调查局（United States Geological Survey, USGS）的激光雷达勘测数据，明确了向海最远端沙丘脊线、沙丘坡脚的高程与位置，以及平均高潮位海岸线。数据集包含海滩宽度参数，其定义为沿垂直海岸剖面测量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参数，结合海岸线与沙丘坡脚的高程计算得出。