2005 Annual Report
This report serves to document research conducted under a Specific Cooperative Agreement between ARS and the University at Buffalo. Additional details of research can be found in the report for the parent project 6408-13000-012-00D, Integrated Analysis of Landscape Processes for Management of Agricultural Watersheds. Flood-control reservoirs built by federal agencies trap sediment from upstream sources, and this sediment reduces the storage capacity of the reservoir and may pose an environmental risk if the sediment is contaminated and released at a later time. Laboratory experiments of the sediments contained in the Hubbard-Murphree reservoir, Charleston, MS, showed that the mobility of key chemical elements decreased as these sediments became exposed to oxygen. Thus, dredging of this sediment could be used to extend the service life of the structure. A sediment budget analysis performed for Grenada Lake, MS, showed that nearly 75% of sediment eroded in the watershed remains stored upstream of the reservoir, and these sediments could be remobilized later in time. These data will be used to assess sediment and nutrient loadings within highly erosive, cultivated watersheds within the lower Mississippi River valley and their role in water quality impairment.
7.List your most important publications in the popular press and presentations to organizations and articles written about your work. (NOTE: List your peer reviewed publications below).
Davidson, G.R., Bennett, S.J., Beard, W.C., III, Waldo, P. 2005. Trace elements in sediments of an aging reservoir in rural Mississippi: Potential for mobilization following dredging. Water, Air, & Soil Pollution, 163(1-4):281-292.
Bennett, S.J., Rhoton, F.E., Dunbar, J.A. 2005. Texture, spatial distribution, and rate of reservoir sedimentation within a highly erosive, cultivated watershed: Grenada Lake, MS. Water Resources Research, 41(1), W01005, doi:10.1029/2004WR003645, 11 pp.
McGeehin, J., Burr, G.S., Hodgins, G., Bennett, S.J., Robbins, J.A., Morehead, N., Markewich, H. 2004. Stepped-combustion 14C dating of bomb carbon in lake sediment. Radiocarbon, 46(2):893-900.