Sediment Sample Locations 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 better understand 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 to investigate how this new sediment source will interact with and affect the morphologic evolution of the barrier-island system. Data collected from this study will 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 will provide information about sediment interactions and movement between the berm and the natural island platform, improving our understanding of 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.

作为障壁岛演化研究（Barrier Island Evolution Research, BIER）项目的组成部分，美国地质调查局（United States 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月在钱德勒勒群岛北部采集了沉积物样品。本项目整合地球物理（水深测量、地震与地形）数据与沉积学数据，整体目标是更深入地理解驱动障壁岛在年度至年际时间尺度（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月间，为应对深水地平线（Deepwater Horizon）漏油事故，路易斯安那州沿钱德勒勒群岛北部平台修建了一条总长超14千米的沙堤。该沙堤的修建为研究这一新增沉积物源如何与障壁岛系统相互作用并影响其形态演化提供了独特契机。本研究采集的数据将用于描述沙堤轴线沿线，以及横穿沙堤并延伸至邻近障壁岛的断面处沉积物的物理特征与空间分布差异。将本研究数据与此前采样获取的数据进行对比，可揭示沙堤与天然群岛平台间的沉积物相互作用与运移规律，从而加深对该障壁岛系统短期形态变化及相关过程的认知。
本数据集系列为2013年7月在钱德勒勒群岛沙堤及邻近障壁岛环境中采集的沉积物数据档案。可从http://pubs.usgs.gov/ds/894/ds894_data.html下载相关数据产品，包括岩心描述编录、岩心照片与X射线影像、沉积物粒度分析结果、采样点位图，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。