1999 Fall Texas USGS/NASA/NOAA 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 1999 Fall Gulf Coast (Texas) NOAA/USGS/NASA 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（National Assessment of Coastal Change Hazards project）下设的风暴诱发海岸变化灾害子课题，聚焦于探究极端风暴对沙质海滩的影响强度与变异性。由激光雷达（Lidar）获取的沙丘脊线、坡脚与海岸线等海滩地貌特征，有助于明确海滩在风暴冲击下的脆弱性。本数据集界定了1999年秋季墨西哥湾沿岸（得克萨斯州段）由美国国家海洋和大气管理局（NOAA）、美国地质调查局（USGS）与美国国家航空航天局（NASA）联合开展的激光雷达测绘所得到的向海侧最外侧沙丘脊线、坡脚，以及平均高潮位海岸线的高程与位置。数据集包含海滩宽度参数，其定义为垂直海岸剖面上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，结合海岸线与沙丘坡脚的高程计算得出。