Tracklines of sidescan sonar data collected by the U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center offshore of the Gulf Islands, MS, 2010 (ESRI polyline shapefile, 10cct02_k3900_Tracklines.shp)

In 2010, the U.S. Geological Survey in Woods Hole, MA and St. Petersburg, FL, in partnership with the U.S. Army Corps of Engineers, Mobile District conducted geologic mapping to characterize the seafloor and shallow subsurface stratigraphy offshore of the Gulf Islands of Mississippi. The mapping was carried out during two cruises in March, 2010 on the R/V Tommy Munro of Biloxi, MS. Data were acquired with the following equipment: an SEA Ltd SwathPlus interferometric sonar (both 234 kHz and 468 kHz systems), a Klein 3000 and a Klein 3900 dual frequency sidescan-sonar, and an Edgetech 512i chirp subbottom profiling system. The long-term goal of this mapping effort is to produce high-quality, high-resolution geologic maps and geophysical interpretations that can be utilized to identify sand resources within the region and better understand the Holocene evolution and anticipate future changes in this coastal system. More information on the field work can be accessed from the Woods Hole Coastal and Marine Science Center Field Activity webpage https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-012-FA or the St. Petersburg Coastal and Marine Geology InfoBank https://walrus.wr.usgs.gov/infobank/m/m210gm/html/m-2-10-gm.meta.html.2010年，美国地质调查局（U.S. Geological Survey）在马萨诸塞州伍兹霍尔及佛罗里达州圣彼得斯堡的分支机构，联合美国陆军工程兵团莫比尔分局，针对密西西比湾群岛近岸海域开展海底与浅层地下地层特征刻画的地质填图工作。本次填图作业于2010年3月分两个航次实施，作业平台为密西西比州比洛克西市的“R/V Tommy Munro”号科考调查船。数据采集采用以下专业设备：SEA有限公司（SEA Ltd）的SwathPlus干涉声呐系统（包含234 kHz与468 kHz两套工作频段）、Klein 3000及Klein 3900双频侧扫声呐，以及Edgetech 512i型啁啾式浅地层剖面系统。本次地质填图工作的长期目标是产出高质量、高分辨率的地质图件与地球物理解译成果，用于识别该区域内的砂质资源，深化对该海岸系统全新世演化过程的认知，并预判其未来变化。如需获取更多野外作业相关信息，可访问伍兹霍尔海岸与海洋科学中心野外活动网页（https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-012-FA），或圣彼得斯堡海岸与海洋地质信息库（https://walrus.wr.usgs.gov/infobank/m/m210gm/html/m-2-10-gm.meta.html）。