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MODELING WAVE-INDUCED ENTRAINMENT OF MUD IN NEWNANS LAKE, FLORIDA
Citation:
HAYTER, E. J., M. JAIN, AND A. J. MEHTA. MODELING WAVE-INDUCED ENTRAINMENT OF MUD IN NEWNANS LAKE, FLORIDA. Presented at INTERCOH '07- 9th International Conference on Nearshore and Estuarine Cohesive Sediment Transport Processes, Brest, FRANCE, September 25 - 28, 2007.
Impact/Purpose:
The objective of this task is to develop, support and transfer a wide variety of tools and mathematical models that can be used to support watershed and water quality protection programs in support of OW, OSWER, and the Regions.
Description:
Many shallow lakes in the southeastern US are eutrophic, and as such, the water quality in these lakes is of concern to state and federal environmental regulatory agencies. Some of these lakes have been classified as impaired with one or more nutrients being the stressor. For these water bodies, a TMDL (total maximum daily load) must be established for the purpose of improving the water quality. Establishment of a TMDL requires estimation of nutrient influxes and effluxes as well as sources and/or sinks of nutrients within the lake. Most of these eutrophic lakes are typically loaded with fine-grained, organic-rich mud at the bottom. Nutrients are usually adsorbed to the fine-grained sediments and organic matter that constitute the mud. Sorbed nutrients (i.e., phosphate, ammonium) in the mud may be re-introduced to the water column through one or more of the following processes: desorption of the nutrients from the mud particles; diffusive and possibly groundwater-induced advective transport of the dissolved nutrients through the pore water in the mud; diffusive and bioturbation enhanced flux of the dissolved nutrients from the surficial mud layer to the water column; and entrainment of surficial mud particles. Thus, estimation of internal loading of nutrients from the mud to the water column requires the ability to simulate these processes. In this study the ability to simulate one of these processes - the entrainment of organic-rich mud in a shallow lake - will be investigated using the mud entrainment model developed by Jain.