Digital Shoreline Analysis System version 4.3 Transects with Short-Term Linear Regression Rate Calculations for Alabama

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.

滨海沙质海滩是广受欢迎的休闲度假胜地，周边往往坐落着拥有高价值不动产的聚居社区。尽管沿海基础设施面临洪涝与侵蚀威胁，滨海开发仍在持续升温。因此，社会对精准掌握海岸过去与当前变迁情况的需求日益增长。为响应这些国家层面的需求，美国地质调查局（U.S. Geological Survey, USGS）海岸与海洋地质项目组依托《海岸变迁国家评估项目》，正在收集美国本土毗邻海域以及阿拉斯加、夏威夷部分区域的开放洋域沙质海岸沿线现有可靠历史岸线数据。
目前尚无被广泛认可的海岸变迁分析标准。现有岸线数据测量方法与侵蚀速率计算方案因研究而异，导致相关结果难以整合至州级或区域级评估中。启动《海岸变迁国家评估项目》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。该项目的目标是实现以内部统一的方式，定期且系统地更新岸线变迁评估结果。