2001 Gulf Coast USGS/NASA ATM 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 2001 Gulf Coast USGS/NASA ATM 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下设的风暴诱发海岸变化灾害专项，聚焦于探明极端风暴对沙质海滩的作用强度与时空变异性。通过激光雷达（Lidar）反演得到的海滩地貌特征（如沙丘脊线、坡脚与海岸线），可用于表征海滩抵御风暴影响的脆弱性。本数据集提供了基于2001年美国墨西哥湾沿岸美国地质调查局（USGS）/美国国家航空航天局（NASA）ATM激光雷达勘测数据提取的向海最外侧沙丘脊线、坡脚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，其定义为沿海岸横向剖面测量的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，以及海岸线与沙丘坡脚的高程值计算得到。