KauaiW_LT - Digital Shoreline Analysis System (DSAS) version 4.2 transects with long-term weighted linear regression rate calculations for the Kauai west region from Oomano to Polihale, 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.

滨海沙质海滩是热门休闲度假胜地，周边往往坐落着坐拥珍贵不动产的聚居社区。尽管沿海基础设施面临洪涝与海岸侵蚀的双重威胁，沿岸开发热度仍持续攀升。由此，社会对精准获取岸线历史与现状变化信息的需求日益迫切。为满足这一国家层面的需求，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，正依托“全国岸线变化评估”项目，对美国本土及阿拉斯加、夏威夷部分区域的开阔洋面沙质岸线的现有可靠历史岸线数据进行汇编整合。

目前尚无被广泛认可的岸线变化分析标准。现有岸线数据测量手段与岸线变化速率计算方法因研究案例不同存在显著差异，导致相关研究成果无法整合为全州或区域级的岸线变化评估体系。本“全国岸线变化评估”项目的发起初衷，便是研发一套跨海岸统一的岸线位置变化标准化测量方法，其目标是以内部统一的逻辑，实现岸线变化评估结果的定期、系统更新。