2016 USACE Gulf Coast 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 2016 U.S. Army Corps of Engineers (USACE) Gulf Coast (Alabama and Mississippi) 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.

美国全国海岸变化灾害评估项目下设的风暴诱发海岸变化灾害研究模块，聚焦于探明极端风暴对沙质海滩的影响规模与变异性。由激光雷达（LiDAR）提取的海滩地貌特征，例如沙丘脊线、沙丘坡脚与海岸线，可用于表征海滩抵御风暴影响的脆弱性。本数据集明确了2016年美国陆军工程兵团（USACE）墨西哥湾沿岸（阿拉巴马州与密西西比州）激光雷达测绘所获取的向海侧最外侧沙丘脊线、沙丘坡脚以及平均高潮位海岸线的高程与位置信息。数据集同时包含海滩宽度参数，其定义为沿岸跨剖面，沙丘坡脚与海岸线之间的水平距离。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。