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Current Research

Harnessing the Power of Geophysical Imaging to Recharge California’s Groundwater more
From Satellites to Storage: Using Remote Sensing Data to Monitor Changes in Stored Groundwater More
Kaweah Resistivity Model
Obtaining the Large-Scale Structure of the Kaweah Subbasin From AEM Data More
Identifying Potential Recharge Pathways Using a Towed EM System (tTEM) More
tTEM 132
Using tTEM for Subsurface Characterization at an AgMAR Site More
Helicopter flying with sensor
Searching for Recharge Pathways Along the Edge of the Central Valley More
Kaweah Subbasin Map
Improving Groundwater Models by Combining Airborne EM and InSAR data More
1D Compaction Modeling of Subsidence in California’s San Joaquin Valley More
tTem System
Demonstration of a Towed Geophysical System (tTEM) for the Evaluation of Potential Recharge Sites More
Exploring Hydraulic Connectivity in a Groundwater System with Airborne EM Method More
Modeling Saltwater Intrusion Using Airborne Electromagnetic Data More
Survey Design for acquisition of Airborne EM More
Talking Logging measurments
Estimating Hydraulic Conductivity with NMR logging in Glacial Aquifers More
Aquifers in the Central Valley Mapped Using Airborne Electromagnetic Data More

Past Projects

The WalkTEM system used for TEM data acquisition in the Indian Wells Valley
Aquifer Characterization in the Indian Wells Valley, California Using Geophysical Techniques More
Basin Map
Aquifer Recharge and Recovery: Modeling Flow and Transport More
Sattelite Precipitation Map
Correcting TRMM Data More
Basic Project materials photo
Comparing Laboratory and Borehole NMR in Unconsolidated Aquifers More
Imaging Saltwater Intrusion Using Electrical Resistivity Tomography More
Rosemary Knight (left, Stanford University) and Dave Walsh (right, Vista Clara) with the Javelin direct push NMR logging tool. Ed Reboulet (KGS) is in the background.
The Link Between NMR and K More
It is commonly assumed, in the interpretation of NMR relaxation data, that one pore space is sampled in the time-scale of the experiment.
NMR-Lab Studies of Unconsolidated Materials More
The High Plains Aquifer is one of the world's largest aquifers and spans eight states throughout the Great Plains in the United States. (Source: Kansas Geological Survey, Kansas Ground Water)
Logging and Surface NMR in the High Plains Aquifer, Nebraska More
Laboratory experiment demonstrating the feasibility of the proposed method to estimate the B0 inhomogeneity. Black curves (T2*): the measured relaxation times when B0 inhomogeneity effects are present in the free induction decay (FID) measurement. Blue curves: relaxation times measured in a homogeneous B0 field. Red curves: predicted relaxation times using proposed method.
Surface NMR- Addressing Field Inhomogeneity More
Satellites Used to Link California Arsenic Contamination to Groundwater Pumping More