Single-Beam Bathymetry Survey Tracklines Collected in 2011 from the Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 11BIM02)

As part of the Barrier Island Evolution Research Project, scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center conducted nearshore geophysical surveys off the northern Chandeleur Islands, Louisiana, in June of 2011. The overall objectives of the study are to better understand barrier-island geomorphic evolution, particularly storm-related depositional and erosional processes that shape the islands over annual to interannual timescales (1-5 years). Collection of geophysical data will allow us to identify relationships between the geologic history of the island and its present day morphology and sediment distribution. This mapping effort was the first in a series of three planned surveys in this area. High resolution geophysical data collected in each of three consecutive years along this rapidly changing barrier-island system will provide a unique time-series dataset that will significantly further the analyses and geomorphological interpretations of this and other coastal systems, improving our understanding of coastal response and evolution over short time scales (1-5 years).
This report serves as an archive of processed interferometric swath and single-beam bathymetry data that were collected during two cruises (USGS Field Activity Numbers 11BIM01 and 11BIM02) along the northern portion of the Chandeleur Islands, Breton National Wildlife Refuge, Louisiana, in June of 2011. Geographic information system data products include a 50 m-cell-size interpolated bathymetry grid surface, trackline maps, and point data files. Additional files include error analysis maps, Field Activity Collection System logs, and formal Federal Geographic Data Committee metadata.

作为障壁岛演化研究项目（Barrier Island Evolution Research Project）的一部分，美国地质调查局圣彼得斯堡海岸与海洋科学中心（U.S. Geological Survey St. Petersburg Coastal and Marine Science Center）的科研人员于2011年6月在路易斯安那州尚德勒尔群岛（Chandeleur Islands）北部近岸开展了地球物理勘测。本研究的总体目标是深入理解障壁岛地貌演化过程，尤其是在年际至跨年时间尺度（1~5年）上塑造岛屿的风暴相关沉积与侵蚀作用。通过采集地球物理数据，可厘清岛屿地质历史与现今地貌、沉积物分布之间的内在关联。本次测绘工作是该区域规划开展的三项勘测中的第一项。后续将在连续三年间沿这个快速变化的障壁岛系统采集高分辨率地球物理数据，由此形成的独特时间序列数据集，将极大推动该区域及其他海岸系统的分析与地貌解译工作，加深我们对短时间尺度（1~5年）内海岸响应与演化过程的认知。

本报告作为2011年6月在路易斯安那州布雷顿国家野生动物保护区（Breton National Wildlife Refuge）尚德勒尔群岛北部海域开展的两次航次（美国地质调查局野外活动编号：11BIM01与11BIM02）期间采集的经过处理的干涉条带测深与单波束测深数据的归档文件。地理信息系统（Geographic Information System, GIS）数据产品包含50米单元格分辨率的插值测深栅格表面、测线地图以及点数据文件。额外附带文件包括误差分析图、野外活动采集系统日志以及正式的联邦地理数据委员会（Federal Geographic Data Committee, FGDC）元数据。