2012 Post-Hurricane Isaac 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 Isaac (Louisiana to Alabama) 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.

《国家海岸变化灾害评估项目》中的风暴诱发海岸变化灾害子课题，聚焦于明晰极端风暴对沙质海滩的影响规模与变异性。激光雷达（LiDAR）反演得到的沙丘脊线、滩脚与岸线等海滩地貌特征，可为界定海滩抵御风暴影响的脆弱性提供依据。本数据集基于2012年艾萨克飓风过后，美国地质调查局（USGS）在路易斯安那州至阿拉巴马州区域开展的激光雷达测量工作，提取了向海一侧最外侧的沙丘脊线、滩脚以及平均高潮位岸线的高程与位置信息。数据集包含海滩宽度指标，其定义为跨岸剖面上沙丘滩脚与岸线之间的距离；海滩坡度则通过该海滩宽度，结合岸线与沙丘滩脚的高程计算得到。