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Home | Tampa Bay Study | Data | Task 2: Water and Sediment Quality - Electrical Resistivity Imagery

This page is archived and is no longer being maintained. Content was last updated in 2015. For current research, visit http://coastal.er.usgs.gov/.

To evaluate the role of submarine ground-water discharge and the dynamics of the fresh water/salt water interface, Tampa Bay Study scientists utilized both stationary and streaming multi-electrode DC resistivity. Processed resistivity (reciprocal of electrical conductivity) models were used to examine the subsurface hydrogeology. (Electrical resistivity is measured in Ohm-m.)

USGS scientists, in cooperation with Eckerd College and the University of South Florida, used such geophysical methods to identify sites where groundwater discharge might occur in Tampa Bay and examined the dynamics of the fresh water / salt water interface. Knowledge of these processes improved the ability to manage the water quality of both Tampa Bay and the surrounding groundwater resources.

Tampa Bay Electrical Resistivity Profiles and Trackline
Select data points along transect lines to view resistivity profile for that segment of the trackline. 
Tampa Bay Electrical Resistivity profiles and trackline
For the Tampa Bay electrical resistivity imaging (ERI) survey, a large number of electrodes were laid out behind a boat. The electrodes emit currents that pass through the water and into the earth. A second set of voltage meters receive the signal and the resulting data was interpreted using special computer software. The result was a profile of subsurface resistivity distribution that was analyzed and interpreted by scientists.
Resistivity image 1 Resistivity image 2
Select image to view enlargement
Images show one example of a modeled resistivity (resistivity = electrical conductivity-1) image which was aquired using 100m cable (2 current and 9 potential electodes spaced 10m apart) and an eight-channel receiver (Advanced Geosciences Inc. SuperSting) along a East-West transect across Tampa Bay.

Longitude: 82_4335Longitude: 82_44727Longitude: 82_46268.Longitude: 82_47937Longitude: 82_49682Longitude: 82_51362Longitude: 82_52983Longitude: 82_54572Longitude: 82_5607Longitude: 82_57533Longitude: 82_59043Longitude: 27.75277Longitude: 27.75057Longitude: 27.77048Longitude: 27.76805Longitude: 27.76555Longitude: 27.7626Longitude: 27.76Longitude: 27.75757Longitude: 27.7552227.75057
View the complete tracklines. Please note large image and file sizes.
Trackline 051214B: View complete image of trackline 051214B Height = 216 pixels, Width = 9,720 pixels. Image file size = 357 kb.
Trackline 051214: View complete image of trackline 051214 Height = 300 pixels, Width = 8,894 pixels. Image file size = 536 kb.

U.S. Department of the Interior, U.S. Geological Survey, Gulf of Mexico Integrated Science
URL of this page is: http://gulfsci.usgs.gov/tampabay/data/2_resistivity_imagery/index.html
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This page last revised: Wednesday, April 20, 2016 @ 03:10 PM  (BB)
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