Archive of Side Scan Sonar and Swath Bathymetry Data Collected During USGS Cruise 13CCT04 Offshore of Petit Bois Island, Gulf Islands National Seashore, Mississippi, August 2014

In August of 2013, the U.S. Geological Survey (USGS) conducted geophysical surveys offshore of Petit Bois Island, Mississippi. These efforts are a continued part of the U.S. Geological Survey Gulf of Mexico Science Coordination partnership with the U.S. Army Corps of Engineers (USACE) to assist the Mississippi Coastal Improvements Program (MsCIP) and the Northern Gulf of Mexico (NGOM) Ecosystem Change and Hazards Susceptibility Project, by mapping the shallow geologic stratigraphic framework of the Mississippi Barrier Island Complex. These geophysical surveys will provide the data necessary for scientists to define, interpret, and provide baseline bathymetry and seafloor habitat for this area to aid scientists in predicting future geomorphological changes to the islands with respect to climate change, storm impacts, and sea level rise. Furthermore, these data combined with the geomorphological results will provide the properties and extent of local offshore sand sediment resources available for planning and execution of the Gulf Islands National Seashore barrier island restoration. The geophysical data were collected during one cruise (USGS Field Activity Numbers 13CCT04) aboard the University of Southern Mississippi Research Vessel Tommy Munro offshore along the gulf side of Petit Bois Island, Gulf Islands National Seashore, Mississippi. Data were acquired with the following equipment: a Systems Engineering and Assessment, Ltd., SWATHplus interferometric sonar (468 kilohertz (kHz)), an EdgeTech 424 (4-24 kHz), an EdgeTech 525i chirp sub-bottom profiling system, and a Klein 3900 sidescan sonar system. This report serves as an archive of the processed interferometric swath bathymetry and sidescan sonar data. Geographic information system data products include an interpolated digital elevation model, an acoustic backscatter mosaic, a trackline map, and point data files. Additional files include error analysis maps, Field Activity Collection System logs, and formal Federal Geographic Data Committee metadata. NOTE: These data are scientific in nature and are not to be used for navigation. Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Government.2013年8月，美国地质调查局（U.S. Geological Survey, USGS）在密西西比州佩蒂布瓦岛（Petit Bois Island）近海开展地球物理勘测。此项工作是美国地质调查局与美国陆军工兵团（U.S. Army Corps of Engineers, USACE）墨西哥湾科学协调合作项目的延续，旨在通过绘制密西西比堡岛复合体（Mississippi Barrier Island Complex）的浅部地质地层框架，为密西西比海岸改善计划（Mississippi Coastal Improvements Program, MsCIP）以及北墨西哥湾（Northern Gulf of Mexico, NGOM）生态系统变化与灾害敏感性项目提供支持。 本次地球物理勘测所获数据，可为科研人员界定、解读该区域的基础水深地形与海底生境提供必要支撑，助力科学家针对气候变化、风暴影响及海平面上升情境，预测该堡岛群未来的地貌变化。此外，结合地貌分析结果，这些数据还可明确当地近海沙质沉积物资源的属性与分布范围，为墨西哥湾群岛国家海岸（Gulf Islands National Seashore）堡岛修复工程的规划与实施提供依据。 本次地球物理数据采集于单次科考航次（美国地质调查局野外活动编号：13CCT04），作业平台为南密西西比大学研究船"汤米·芒罗"号（Tommy Munro），作业区域位于密西西比州墨西哥湾群岛国家海岸内佩蒂布瓦岛近海墨西哥湾侧海域。采集所用设备包括：Systems Engineering and Assessment, Ltd.公司的SWATHplus干涉测深声呐（468千赫，kHz）、EdgeTech 424型（4-24千赫）声呐、EdgeTech 525i型啁啾子海底剖面系统，以及Klein 3900型侧扫声呐系统。 本报告为经过处理的干涉条带测深与侧扫声呐数据档案。地理信息系统数据产品包含插值数字高程模型、声学背散射镶嵌图、测线地图以及点数据文件。附加文件包括误差分析图件、野外活动采集系统日志，以及正式的联邦地理数据委员会（Federal Geographic Data Committee, FGDC）元数据。 注意：本数据集为科研性质，不得用于导航用途。文中提及的商品名称仅用于描述目的，并不代表美国政府的背书或认可。