Archive of Chirp Subbottom Profile Data Collected in 2017 from the Louisiana Chenier Plain

June 2–10 and July 2, 2017, the U.S. Geological Survey (USGS) conducted geophysical surveys offshore of the Louisiana Chenier Plain to document the changing morphology of the coastal environment. Data were collected under the Barrier Island Coastal Monitoring (BICM) program, an ongoing collaboration between the State of Louisiana Coastal Protection and Restoration Authority (CPRA), the University of New Orleans (UNO) Pontchartrain Institute for Environmental Sciences (PIES), and the USGS. Project objectives include compiling historical shoreline bathymetric datasets and comparing them to other bathymetric data collected during the BICM project. At the same time, subsurface geophysical data were collected to investigate the geomorphology and geologic controls on barrier-shoreline evolution. This publication serves as an archive of unprocessed, digital chirp subbottom data, survey trackline maps, navigation files, geographic information system (GIS) data, and formal Federal Geographic Data Committee (FGDC) metadata. Processed subbottom profile images are also provided. The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG Y revision 0 format (Barry and others, 1975) and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU).
These data are available for viewing using GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean (http://www.virtualocean.org/) multi-platform open source software. In addition, the SEG Y files can be downloaded from the USGS Coastal and Marine Geoscience Data System (CMGDS, https://cmgds.marine.usgs.gov).

2017年6月2日至10日及7月2日，美国地质调查局（U.S. Geological Survey, USGS）在路易斯安那州契安尼奈平原近海开展地球物理调查，以记录海岸环境的形态变化。数据采集依托障壁岛海岸监测（Barrier Island Coastal Monitoring, BICM）计划实施，该计划是路易斯安那州海岸保护与恢复管理局（Coastal Protection and Restoration Authority, CPRA）、新奥尔良大学庞恰特雷恩环境科学研究所（Pontchartrain Institute for Environmental Sciences, PIES）与USGS的长期合作项目。
项目目标包括整合历史岸线水深数据集，并将其与BICM项目期间采集的其他水深数据进行对比；同时采集地下地球物理数据，以探究障壁岸线演化的地貌与地质控制机制。本归档数据包含未处理的数字啁啾子底数据、调查航迹图、导航文件、地理信息系统（GIS）数据以及正式的联邦地理数据委员会（Federal Geographic Data Committee, FGDC）元数据，同时还提供处理后的子底剖面图像。归档的轨迹数据采用标准勘探地球物理学家协会（Society of Exploration Geophysicists, SEG）SEG Y 0版格式（Barry等，1975），可通过商业或开源软件（如Seismic Unix, SU）进行下载与处理。
用户可通过多平台开源软件GeoMapApp（http://www.geomapapp.org/）与Virtual Ocean（http://www.virtualocean.org/）查看上述数据。此外，SEG Y格式文件可从USGS海岸与海洋地球科学数据系统（Coastal and Marine Geoscience Data System, CMGDS，https://cmgds.marine.usgs.gov）下载。