Offshore baseline for the southeastern Florida (FLse) coastal region generated to calculate shoreline change rates

Sandy ocean beaches are a popular recreational destination, often surrounded by communities containing valuable real estate. Development is on the rise despite the fact that coastal infrastructure is subjected to flooding and erosion. As a result, there is an increased demand for accurate information regarding past and present shoreline changes. To meet these national needs, the Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) is compiling existing reliable historical shoreline data along open-ocean sandy shores of the conterminous United States and parts of Alaska and Hawaii under the National Assessment of Shoreline Change project.
There is no widely accepted standard for analyzing shoreline change. Existing shoreline data measurements and rate calculation methods vary from study to study and prevent combining results into state-wide or regional assessments. The impetus behind the National Assessment project was to develop a standardized method of measuring changes in shoreline position that is consistent from coast to coast. The goal was to facilitate the process of periodically and systematically updating the results in an internally consistent manner.

沙质海洋海滩是热门的休闲度假胜地，周边往往坐落着坐拥高价值不动产的聚居社区。尽管沿海基础设施饱受洪涝与侵蚀威胁，海岸开发仍呈上升态势。由此，社会对精准掌握海岸过去与当前变化情况的需求与日俱增。为满足此类国家层面的需求，美国地质调查局（U.S. Geological Survey, USGS）下属的海岸与海洋地质项目组依托海岸变化国家评估（National Assessment of Shoreline Change）项目，正在收集美国本土、阿拉斯加部分区域及夏威夷的开放洋域沙质海岸沿线的现有可靠历史海岸线数据。
目前尚无被广泛认可的海岸线变化分析标准。现有海岸线数据测量方法与岸线变化速率计算方式因研究而异，导致无法将各地研究结果整合为州级或区域级评估成果。本次海岸变化国家评估项目的核心初衷，是研发一套跨海岸统一的海岸线位置变化标准化测量方法。其目标是实现以内部统一的标准，定期且系统地更新评估结果。