Raccourci Lake and Island, Louisiana, sediment particle size analysis and geophysical transforms

These data were collected as part of a cooperative study with the U.S. Army Corps of Engineers investigating deposition patterns within Raccourci Lake and Island, Louisiana. Samples of sediment were collected from four cores taken to a depth of 30-40 feet on Raccourci Island using a geotechnical drill rig with resistivity analysis capabilities. Subsamples of the core were analyzed for resistivity, sediment particle size distribution, and the percentage of sand, silt, and clay. Samples of recently deposited sediment were collected over marker horizons set in 2019 and 2020, and analyzed for particle size distribution. In the same locations as the collected cores, airborne electromagnetic surveys were analyzed. The electromagnetic resistivity measured during these surveys was compared with the particle size distribution of the cores and samples collected at the surface. These data were used to identify the historic river bed sands and determine deposition patterns in the lake above those sands over time. In addition, flow patterns and velocities were estimated from surficial particle sizes across the island.

This data release is in support of: Adams, R.F., Kroes, D.E., Whaling, A. Dahl, T. (In Revision). Integrated geophysical, hydrographic, and geomorphological investigations at Rouccourci Old River, Batchelor, LA.

This data release contains the following files:
1) RaccourciMetaData.xml: The description and methods of the data collection and processing of the raw data included in this data release.
2) Rac2021GrainSizePadSummary_dk.csv: A comma separated value (CSV) file containing the sediment particle sizes deposited on surficial marker horizons during overbank flooding.
3) Rac2021GrainSizeCores_dk.csv: A comma separated value (CSV) file containing sediment particle sizes collected in a sediment core at depth on the Raccourci Island.
4) Rac_Grain_Size_Comps_dk.csv: A comma separated value (CSV) file containing sample depth in the cores, resistivity at depth, and the percentages of sand, silt, and clay at each sample depth.
5) lmom_equations_2024-08-01_nsam_100000.txt: A text file containing the equations created from AEM returns at the core locations that were used to calculate the percentage of sand, silt, and clay of the broader AEM survey of Raccourci Lake and Island.