KauaiS_LT - Digital Shoreline Analysis System (DSAS) version 4.2 transects with long-term weighted linear regression rate calculations for the Kauai south region from Waimea to Kipu Kai, Hawaii

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.

沙质滨海海滩是广受青睐的休闲度假目的地，周边往往分布着坐拥高价值不动产的社区。尽管海岸基础设施屡遭洪涝与侵蚀威胁，沿海开发进程仍呈上升态势。在此背景下，社会对精准获取历史与当前海岸线变化信息的需求愈发迫切。为满足此类国家层面的需求，美国地质调查局（U.S. Geological Survey, USGS）的海岸与海洋地质项目组依托“海岸线变化国家评估（National Assessment of Shoreline Change）”项目，正在汇编美国本土48州及阿拉斯加、夏威夷部分区域的开放洋域沙质海岸沿线的现有可靠历史海岸线数据。
当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变化速率计算方法因研究而异，导致无法将各研究结果整合至全州或区域尺度的评估工作中。该国家评估项目的核心动因，便是研发一套全海岸统一一致的海岸线位置变化标准化测量方法，目标是以内部统一的方式定期、系统性地更新评估结果。