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The electrical properties of soils and rocks are sensitive to variations in their saturation, the more water the ground has, the smaller is its resistivity. This relationship can be exploited for monitoring of groundwater processes, like managed aquifer recharge.
The electrical properties of soils and rocks are sensitive to variations in their saturation, the more water the ground has, the smaller is its resistivity. This relationship can be exploited for monitoring of groundwater processes, like managed aquifer recharge.
Monitoring of urban groundwater recharge
Monitoring of urban groundwater recharge
Together with Los Angeles County Public Works, we are monitoring the efficiency of Low Impact Developments/Sustainable Urban Drainage systems for groundwater recharge. We are using borehole ERT to monitor to subsurface flow paths
The animation shows the results of a controlled infiltration experiment, where water occupies hydraulically conductive layers.
Assessing the performance of recharge ponds
Assessing the performance of recharge ponds
To optimize water recharge efficiency, we monitored dedicated recharge ponds using a grid of surface electrodes. The animation shows the imaged changes in resistivity, that correspond to water infiltration into the deeper subsurface. Recharge is limited in the upper part of the pond, where fines had accumulated at the surface.
The hydrogeophysical characterization of this site is published here. The project is described in detail here.
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