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Characterization of the hydrogeologic framework at Aberdeen Proving Ground, Maryland, using marine seismic reflection profiling


, : Characterization of the hydrogeologic framework at Aberdeen Proving Ground, Maryland, using marine seismic reflection profiling. Proceedings of the Symposium on the Application of Geophysics to Environmental and Engineering Problems (SAGEEP) 1997(Pages 453-462

High-resolution, single-channel, marine seismic reflection profiles were collected in the shallow waters of the Chesapeake Bay estuarine system surrounding the Edgewood Area of Aberdeen Proving Ground, MD. This data set furthers our understanding of the hydrogeologic framework by identifying paleochannel locations, delineating paleochannel geometries, and characterizing relationships between multiple generations of paleochannels. Fine-grained bottom sediment resting in deeper, low-energy waters were found to block high-frequency acoustic wave transmission; therefore, data acquisition is limited to areas near-shore were water depths are less than three meters. Approximately 120 km of shoreline were surveyed yielding 50 km of high quality data. Three major reflectors are identified as erosional unconformities, and are interpreted to be Pleistocene paleochannel surfaces. Paleochannels are found to be spatially and physiographically associated with all modern subaerial lowlands and their local drainage systems. The marine seismic reflection data provide strong evidence that present-day lowlands are underlain by an aquifer dominated by paleochannels. Paleochannel configurations, together with paleochannel-fill models, indicate these paleochannels have the potential support vertical and horizontal contaminant migration.

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