Digital Shoreline Analysis System version 4.3 Transects with Long-Term Linear Regression Rate Calculations for Louisiana

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.

滨海沙质海滩是热门的休闲度假胜地，周边往往坐落着拥有高价值不动产的人居社区。尽管沿海基础设施面临洪涝与海岸侵蚀的威胁，滨海开发热度仍持续攀升。因此，社会对能够精准反映历史与当前岸线变化情况的信息需求日益增长。为满足这些国家层面的需求，美国地质调查局（U.S. Geological Survey, USGS）下属的海岸与海洋地质项目（Coastal and Marine Geology Program），依托全国岸线变化评估（National Assessment of Shoreline Change）项目，正在收集整理美国本土（毗邻沿海州）、阿拉斯加部分区域以及夏威夷的开阔洋域沙质海岸的现有可靠历史岸线数据。
目前尚无被广泛认可的岸线变化分析标准。现有岸线数据的测量方式与岸线变化速率的计算方法因研究而异，导致无法将不同研究的结果整合至州级或区域级评估当中。开展本次全国岸线变化评估项目的初衷，便是研发一套跨海岸统一的标准化岸线位置变化测量方法。其目标在于以内部统一的规范，实现岸线变化评估结果的周期性、系统化更新流程的便捷化。