Impact of Non-linear Sedimentation on Dredge Area Benthic Ecosystem on Louisiana Shelf

This project investigates the impacts of fluid mud events on water quality and biogeochemistry in a dredging area offshore Raccoon Island, Louisiana. Fluid mud events do not alter sedimentary oxygen consumption rates, despite transporting large amounts of sediment. This paradox is due to high temperatures and low availability of labile organic matter, which decomposes rapidly, and the offshore transport of organic matter during the post-sedimentation stage. A coupled 3D model captures the general deposition patterns and identifies two high fluid mud probability regions influenced by wave energy and sediment supply. The model's long-term sedimentation trends can guide sustainable dredging operations. Benthic community composition, particularly the presence of Amphioxus spp., can indicate fluid mud thickness and its ecological impacts in coastal Louisiana.

USD: $352,729

2020-06-15 → 2024-07-15