HR: 0800h
AN: H11C-0672    [Abstracts]
TI: Improving lakebed sediment quality in an urban estuary, Presque Isle Bay, Lake Erie, USA
AU: * Foyle, A M
EM: amf11@psu.edu
AF: School of Science, Penn State Erie - The Behrend College, Station Road, Erie, PA 16563, United States
AU: Norton, K P
EM: k.norton@mineralogie.uni-hannover.de
AF: Institute for Mineralogy, University of Hannover, Hannover, 00000, Germany
AB: Presque Isle Bay, Lake Erie, is a microtidal freshwater estuary on the North American Great Lakes. It is one of 40 remaining environmental Areas of Concern (AoCs) on the Great Lakes that have one or more water, habitat, or sediment quality impairments as defined by the International Joint Commission. In-situ natural capping using sediment from to-be-remediated watersheds and other sources is being considered as the most feasible means of remediating contaminated sediments in the estuary. A multi-decade sediment budget shows that, when localized anthropogenic effects are accounted for, the estuary net-accumulated sediment over time from three major sources: the Lake Erie littoral system (20%), streams (25%), and bank erosion and bluff recession (41%). The non-stream sources supply environmentally clean sediment from ancient coastal deposits along the shoreline, and from the modern littoral system. However, organic and metallic contaminants are supplied by streams and run-off and remain a remediation challenge. From a geological perspective, natural capping of contaminated sediment over the next several decades is a viable solution for the majority of the bay. The mechanism may not work effectively in all areas because approximately 25% of the bay floor is moderately net- erosional or accumulates sediments very slowly.
DE: 1803 Anthropogenic effects (4802, 4902)
DE: 1815 Erosion
DE: 1861 Sedimentation (4863)
DE: 1879 Watershed
SC: Hydrology [H]
MN: 2007 Fall Meeting