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Application of sediment end-member analysis for understanding sediment fluxes, northern Chandeleur Islands, Louisiana

June 1, 2019

We analyzed grain-size distributions (GSDs) from a time-series of sediment samples to evaluate sediment transport following anthropogenic sand-berm emplacement at the northern Chandeleur Islands, Louisiana. End-member analysis (EMA) was applied to compare the end-member (EM) GSD of a known sediment source to GSDs from surrounding environments and characterize the physical redistribution of source sediment over time. Although we successfully modeled a proxy borrow-source EM using pre-emplacement (2007-2008) datasets, this EM is not easily distinguishable from the modeled emergent-island EM, possibly because the baseline dataset did not provide the necessary sample distribution to distinguish the range of depositional environments. Comparison of post-emplacement (2012) samples from the berm and natural island with the proxy borrow-source EM suggests that this application of EMA can be a valuable tool for understanding sediment redistribution subsequent to restoration efforts, especially if the GSDs of the emplaced and naturally-occurring sediments are dissimilar and adequately sampled.

Citation Information

Publication Year 2019
Title Application of sediment end-member analysis for understanding sediment fluxes, northern Chandeleur Islands, Louisiana
DOI 10.1142/9789811204487_0003
Authors Julie Bernier, Jennifer L. Miselis, Noreen A. Buster, James G. Flocks
Publication Type Conference Paper
Index ID 70204255
Record Source USGS Publications Warehouse
USGS Organization St. Petersburg Coastal and Marine Science Center