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December 31, 2003

Electrical imaging of tracer migration at the Massachusetts Military Reservation, Cape Cod

Electrical resistivity tomography (ERT) is examined as a method to provide spatially continuous information about aquifer properties through imaging of tracer flow and transport in an unconfined aquifer. Field data were collected at the Massachusetts Military Reservation, Cape Cod, Massachusetts, during the summer of 2002. High resolution images in both space and time of the movement of an electri

Authors

Kamini Singha, Andrew Binley, John W. Lane, Steven M. Gorelick

Ecosystems Mission Area, Groundwater and Streamflow Information Program, Toxic Substances Hydrology, Environmental Health Program

December 31, 2003

Object-based inversion of crosswell radar tomography data to monitor vegetable-oil injection experiment

Crosswell radar tomography methods can be used to dynamically image ground-water flow and mass transport associated with tracer tests, hydraulic tests, and natural physical processes. Dynamic imaging can be used to identify preferential flow paths and to help characterize complex aquifer heterogeneity. Unfortunately, because the raypath coverage of the interwell region is limited by the borehole g

Authors

John W. Lane, Frederick D. Day-Lewis, Roelof J. Versteeg, C.C. Casey

Ecosystems Mission Area, Groundwater and Streamflow Information Program, Toxic Substances Hydrology, Environmental Health Program

December 31, 2003

Continuous-resistivity profiling for coastal ground-water investigations: Three case studies

Continuous-resistivity profiling (CRP) was used at three sites to investigate submarine groundwater discharge (SGD) and to delineate the subsurface saltwater/freshwater interface. At the first site, in Georgetown, South Carolina, CRP was used to locate possible areas of SGD in the Winyah Bay estuary. The data show evidence of SGD in the Pee Dee River, feeding into Winyah Bay, at approximately the

Authors

Marcel Belaval, John W. Lane, David P. Lesmes, G. C. Kineke

Groundwater and Streamflow Information Program

December 31, 2003