Single-Beam Bathymetry Data Collected in 2015 from Grand Bay, Mississippi/Alabama

This data release archives processed single-beam bathymetry (SBB) data, collected from May 28-June 3, 2015 (USGS Field Activity Number 2015-315-FA) within Grand Bay Mississippi/Alabama, as part of the Sea level and Storm Impacts on Estuarine Environments and Shorelines project (SSIEES). The goal of the SSIEES project is to assess the physical controls of sediment and material exchange between wetland and estuarine environments. The data described in this report provide baseline bathymetric information for future research investigating wetland/marsh evolution, sediment transport, and recent and long term geomorphic change. The data will also support modeling of future changes in response to restoration and storm impacts. The survey area encompasses more than 40 square kilometers (km2) of Grand Bay's incorporated waters with more than 600 line-km of single-beam bathymetry data collected aboard two survey platforms: the RV Shark (Sub-cruise identifier 15CCT04) and the RV Chum (15CCT05). Final data files presented in this report are released in WGS84 (ITRF00) Ellipsoid Height (values range from -33.36 meters (m) to -29.53 m); NAD83 (CORS 96), NAVD88 orthometric heights, derived from the GEOID12A geoid model (values range from -3.95 m to -0.01 m); and NAD83 (CORS 96) Mean Lower Low Water (MLLW) (values range from -3.83 m to 0.11 m). Geographic Information System (GIS) data products include: a 10 m and 30 m cell-size interpolated bathymetry grids, trackline maps, point data files and formal Federal Geographic Data Committee (FGDC) metadata. For further information regarding data collection and/or processing methods refer to USGS Data Series 1070 (https://doi.org/10.3133/ds1070). Note: This data release was versioned on April 5, 2018. Please see the Suggested Citation section for details.

本数据集发布归档了经处理的单波束测深（single-beam bathymetry, SBB）数据，采集于2015年5月28日至6月3日期间（美国地质调查局（USGS）野外活动编号：2015-315-FA），采集区域为密西西比州/阿拉巴马州大湾海域，隶属于“海平面与风暴对河口环境及岸线的影响”项目（SSIEES）。SSIEES项目的目标是评估湿地与河口环境间沉积物与物质交换的物理控制机制。本报告所述数据可为未来开展的湿地/沼泽演化、沉积物输运以及短期与长期地貌变化研究提供基准测深信息，同时还将支持针对修复工程与风暴影响下的未来变化开展的模拟研究。本次调查覆盖大湾所辖海域超40平方千米，共采集600余测线公里的单波束测深数据，数据采集依托两艘调查平台：RV Shark（次级航次标识15CCT04）与RV Chum（15CCT05）。本报告中呈现的最终数据文件采用以下三种坐标与高程基准发布：一是WGS84（ITRF00）椭球高，数值范围为-33.36米至-29.53米；二是基于GEOID12A大地水准面模型解算的NAD83（CORS 96）、NAVD88正高，数值范围为-3.95米至-0.01米；三是NAD83（CORS 96）参考下的平均最低低潮面（Mean Lower Low Water, MLLW）高程，数值范围为-3.83米至0.11米。地理信息系统（Geographic Information System, GIS）数据产品包括：分辨率为10米与30米的插值测深栅格、测线分布图、点数据文件以及符合联邦地理数据委员会（Federal Geographic Data Committee, FGDC）规范的元数据。如需了解数据采集与处理方法的更多细节，请参考美国地质调查局数据系列1070（https://doi.org/10.3133/ds1070）。注：本数据集发布版本的归档日期为2018年4月5日。详细信息请参阅“推荐引用格式”章节。