Sediment data collected in July 2014 from around Breton and Gosier Islands, Louisiana (U.S. Geological Survey Field Activity Numbers 2014–314–FA and 14BIM04)

Breton Island, located at the southern end of the Chandeleur Islands, supports one of Louisiana’s largest historical brown pelican (Pelecanus occidentalis) nesting colonies. Although the brown pelican was delisted as an endangered species in 2009, nesting areas are threatened by continued land loss and are extremely vulnerable to storm impacts. The U.S. Fish and Wildlife Service proposed to restore Breton Island to pre-Hurricane Katrina conditions through rebuilding the shoreface, dune, and back-barrier marsh environments. Prior to restoration, scientists from the U.S. Geological Survey’s (USGS) St. Petersburg Coastal and Marine Science Center Geologic and Morphologic Evolution of Coastal Margins project collected high-resolution geophysical (topography, bathymetry, and sub-bottom profiles) and sedimentologic data from around Breton Island to characterize the geologic framework of the island platform, nearshore, and shelf environments. These data will be used to characterize the geologic framework around Breton Island, identify potential borrow areas for restoration efforts, quantify seafloor change, and provide information for sediment transport and morphologic change models to asses island response to restoration and natural processes. Data release doi:10.5066/F79C6VKF associated with this metadata record serves as an archive of sediment data from vibracores, push cores, and submerged grab samples collected from around Breton and Gosier Islands, Louisiana, during two surveys conducted in July 2014 and January 2015 (USGS Field Activity Numbers 2014–314–FA and 2014–336–FA, respectively). Sedimentologic and stratigraphic metrics (for example, sediment texture or unit thicknesses) derived from these data can be used to ground-truth the geophysical data and characterize potential sand resources or can be incorporated into sediment transport or morphologic change models. Data collection and processing methods are described in Data Series 1037 (https://doi.org/10.3133/ds1037). Data products, including sample location tables, descriptive core logs, core photographs and x-radiographs, results of sediment grain-size analyses, and geographic information system (GIS) data files with accompanying formal Federal Geographic Data Committee (FGDC) metadata can be downloaded from https://doi.org/10.5066/F79C6VKF.布雷顿岛（Breton Island）坐落于尚德利尔群岛（Chandeleur Islands）南端，是路易斯安那州规模最大的历史褐鹈鹕（Pelecanus occidentalis）筑巢群落的栖息地之一。尽管褐鹈鹕已于2009年被移出濒危物种名录，但其筑巢区域仍面临持续的土地流失威胁，且极易受到风暴灾害的冲击。美国鱼类和野生动物管理局（U.S. Fish and Wildlife Service）提议通过重建岸坡、沙丘与障后沼泽环境，将布雷顿岛恢复至卡特里娜飓风（Hurricane Katrina）前的状态。 在修复工程实施前，美国地质调查局（U.S. Geological Survey, USGS）圣彼得堡海岸与海洋科学中心的“海岸边缘地质与地貌演化”项目组科研人员，在布雷顿岛周边采集了高分辨率地球物理数据（包括地形、水深与浅地层剖面数据）与沉积学数据，以刻画该岛平台、近岸与陆架环境的地质框架。上述数据将用于：刻画布雷顿岛周边的地质框架、识别修复工程所需的潜在取砂区、量化海底地形变化，并为沉积物输运与地貌变化模型提供支撑，以评估岛屿对修复工程与自然过程的响应。 本元数据记录关联的数据集发布DOI：10.5066/F79C6VKF，存档了2014年7月与2015年1月两次野外调查（对应美国地质调查局野外活动编号分别为2014–314–FA与2014–336–FA）中，在路易斯安那州布雷顿岛与戈西尔岛周边采集的振动岩芯、推取岩芯与水下抓取采样的沉积物数据。 由上述数据衍生的沉积学与地层学指标（例如沉积物粒度或地层单元厚度），可用于对地球物理数据进行实地校准、刻画潜在砂矿资源，或被纳入沉积物输运或地貌变化模型。数据采集与处理方法详见数据系列1037（https://doi.org/10.3133/ds1037）。各类数据产品可从https://doi.org/10.5066/F79C6VKF下载，包括采样位置表、岩芯描述日志、岩芯照片与X射线影像、沉积物粒度分析结果，以及附带正式联邦地理数据委员会（Federal Geographic Data Committee, FGDC）元数据的地理信息系统（Geographic Information System, GIS）数据文件。