Offshore baseline for the Texas east (TXeast) 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目的地，周边往往分布着坐拥珍贵不动产的社区。尽管沿海基础设施面临洪涝侵袭与海岸侵蚀的威胁，沿岸开发仍呈持续上升态势。在此背景下，社会对准确获取过去与当前海岸线变化相关信息的需求日益攀升。为满足此类国家层面的现实需求，美国地质调查局（U.S. Geological Survey, USGS）的海岸与海洋地质项目依托《海岸线变化国家评估》（National Assessment of Shoreline Change）项目框架，正在汇集美国本土以及阿拉斯加和夏威夷部分区域的开放大洋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。现有的海岸线数据测量方法与岸线变化速率计算方法因研究而异，导致各研究结果无法整合为全州或区域级的综合评估报告。启动《海岸线变化国家评估》项目的核心动因，便是开发一套跨所有海岸区域统一的海岸线位置变化标准化测量方法。该项目的目标在于，实现以内部逻辑一致的方式，定期且系统地更新相关评估结果。