A Modular Entrainment Model for Cohesive Sediment
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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This paper describes an entrainment model for cohesive sediments that is based on a power-law expression for the excess shear stress and a total entrainment coefficient. Total entrainment includes terms for consolidation. bioturbation, and all other processes base entrainment coefficient. The model is used to predict entrainment rates for cohesive sediments from Lake Erie, the Tamar Estuary, Long Island Sound, and the Fox River, Wisconsin. The base entrainment coefficient. which is estimated using samples with the least post-depositional modification, is unique for each sediment suite because it includes environmentally sensitive processes like mineralogy, salinity. organic carbon content. etc. Base on available entrainment measurements, expressions are presented for the consolidation and bioturbation coefficients. The model is evaluated with entrainment data for identical sediment that has been either consolidated or bioturbated and the comparison is encouraging. A comparison of predicted and measured entrainment rates for undisturbed sediment is less favorable because of its unknown post-depositional history.
- Physical Chemistry
- Physical and Dynamic Oceanography