| Description |
As part of the restoration monitoring component of the Deepwater Horizon early restoration project, scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS SPCMSC) conducted single-beam and multibeam bathymetry surveys around Breton Island, Louisiana (LA), from August 5-10, 2024, for Field Activity Number (FAN) 2024-320-FA. The purpose of data collection was to measure submerged elevations and develop a digital elevation model of the seafloor around Breton Island. These data were collected as part of the Louisiana Outer Coast Restoration Construction Monitoring project supported by funding from the Natural Resource Damage Assessment - Deepwater Horizon Restoration Activities and, in combination with both previous and planned future surveys, can be used to evaluate elevation change following island restoration. The survey area covered approximately 77 square kilometers (km^2) of nearshore environment surrounding Breton Island and extended into the adjacent portion of the former Mississippi River to Gulf Outlet (MRGO). The single-beam bathymetry was acquired using two 12-foot personal watercraft (PWC) and one 20-foot power catamaran. All vessels were outfitted with high precision Global Navigation Satellite System (GNSS) receivers, motion reference units, and survey grade single-beam echosounders (SBES). For additional information on post-processing steps, please refer to DeWitt and others (2016) and Hansen and others (2017). Multibeam echosounder (MBES) data including the backscatter component and chirp seismic sub-bottom data were collected concurrently as part of FAN 2024-320-FA; those data are available as separate data releases: Bemelmans and others (2025); Forde and others (2025), respectively. [More]
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