Sediment Grain-Size Data from Sediment Samples Collected in July 2013 from the Northern Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 13BIM05)

As part of the Barrier Island Evolution Research (BIER) project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) collected sediment samples from the northern Chandeleur Islands in July 2013. The overall objective of this project, which integrates geophysical (bathymetric, seismic, and topographic) and sedimentologic data, is to understand better the depositional and erosional processes that drive the morphologic evolution of barrier islands over annual to interannual timescales (1 to 5 years). Between June 2010 and April 2011, in response to the Deepwater Horizon oil spill, the State of Louisiana constructed a sand berm extending more than 14 kilometers (km) along the northern Chandeleur Islands platform. The construction of the berm provided a unique opportunity for scientists to investigate how this new sediment source interacts with and affects the morphologic evolution of the barrier-island system. Data collected from this study can be used to describe differences in the physical characteristics and spatial distribution of sediments both along the axis of the berm and also along transects across the berm and onto the adjacent barrier island. Comparison of these data with data from prior sampling efforts can provide information about sediment interactions and movement between the berm and the natural island platform, improving insight into short-term morphologic change and processes in this barrier-island system.
This data series serves as an archive of sediment data collected in July 2013 from the Chandeleur Islands sand berm and adjacent barrier-island environments. Data products, including descriptive core logs, core photographs and x-radiographs, results of sediment grain-size analyses, sample location maps, and Geographic Information System (GIS) data files with accompanying formal Federal Geographic Data Committee (FDGC) metadata, can be downloaded from http://pubs.usgs.gov/ds/894/ds894_data.html.

本研究隶属于屏障岛演化研究（Barrier Island Evolution Research, BIER）项目，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（St. Petersburg Coastal and Marine Science Center, SPCMSC）的科研人员于2013年7月从北尚德莱尔群岛采集了沉积物样本。该项目整合了地球物理（geophysical，含水深测量（bathymetric）、地震勘探（seismic）与地形测量（topographic）数据）与沉积学（sedimentologic）数据，旨在更深入地阐明驱动屏障岛在年际至跨年时间尺度（1至5年）内形态演化的沉积与侵蚀过程。

2010年6月至2011年4月期间，为应对深水地平线（Deepwater Horizon）漏油事件，路易斯安那州沿北尚德莱尔群岛平台修建了一条总长超14千米的沙堤。该沙堤的建造为科研人员探究这种新型沉积物源如何与屏障岛系统相互作用并影响其形态演化提供了独特研究契机。

本研究采集的数据可用于描述沙堤轴线，以及横跨沙堤并延伸至邻近屏障岛的样带上沉积物的物理特征与空间分布差异。将此类数据与此前采样获取的数据集进行对比，可揭示沙堤与天然岛台之间的沉积物相互作用与运移规律，进而加深对该屏障岛系统短期形态变化及其过程的认知。

本数据集系列为2013年7月从尚德莱尔群岛沙堤及邻近屏障岛环境采集的沉积物数据档案。可下载的数据产品包括：岩心描述日志、岩心照片与X射线影像（x-radiographs）、沉积物粒度分析结果、采样点位分布图，以及附带正式联邦地理数据委员会（Federal Geographic Data Committee, FDGC）元数据的地理信息系统（Geographic Information System, GIS）数据文件，下载地址为http://pubs.usgs.gov/ds/894/ds894_data.html。