The Center for Groundwater Evaluation and Management Rosemary Knight

Research

Research Topic Areas

Recharging California's Groundwater Airborne Electromagnetic (AEM) Data for Groundwater Management Saltwater Intrusion Subsidence Due to Groundwater Withdrawals Satellite Mapping of Groundwater Systems Nuclear Magnetic Resonance (NMR) for Groundwater Applications

All Current Research

A New Approach to Transforming Airborne Electromagnetic Data into Models of Sediment Type
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Fiber-Optic Distributed Temperature Sensing for Interconnected Surface Water Identification: A Case Study on the Tuolumne River
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Finding Pathways for Recharge of Confined and Semi-Confined Aquifers with Satellite Data
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Locating the Corcoran Clay in California’s San Joaquin Valley using Airborne Electromagnetic data
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Monitoring Groundwater with Seismic Sensors in the Kaweah Subbasin
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Taking the Pulse of the Watershed
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Supporting Floodplain Restoration Projects in Achieving Multibenefit Goals with tTEM
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Where to Recharge in California’s Central Valley? fastpath Products from AEM Data
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Mapping and Monitoring River-Sourced Recharge with Satellite Data
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Record Breaking Subsidence in the San Joaquin Valley, 2006-2022
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Harnessing the Power of Geophysical Imaging to Recharge California’s Groundwater
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Stanford Groundwater Architecture Project (GAP): Pilot Studies for the Statewide AEM Survey
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The Link Between Head, Storage and Subsidence
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From Satellites to Storage: Using Remote Sensing Data to Monitor Changes in Stored Groundwater
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tTEM 132
Using tTEM for Subsurface Characterization at an AgMAR Site
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Helicopter flying with sensor
Searching for Recharge Pathways Along the Edge of the Central Valley
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flood_irrigation_brian_van_der_brug_los_angeles_times_photo_credit
Identifying Potential Recharge Pathways Using a Towed EM System (tTEM)
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Kaweah Subbasin Map
Improving Groundwater Models by Combining Airborne EM and InSAR data
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Kaweah Resistivity Model
Obtaining the Large-Scale Structure of the Kaweah Subbasin From AEM Data
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poland_current_comparison_rhsonly
1D Compaction Modeling of Subsidence in California’s San Joaquin Valley
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tTem System
Demonstration of a Towed Geophysical System (tTEM) for the Evaluation of Potential Recharge Sites
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ButteResistivity
Exploring Hydraulic Connectivity in a Groundwater System with Airborne EM Method
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Mapping and Modeling Saltwater Intrusion Using Airborne Electromagnetic Data
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Survey Design for acquisition of Airborne EM
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Aquifers in the Central Valley Mapped Using Airborne Electromagnetic Data
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Mapping Saltwater Intrusion in an Offshore Coastal Aquifer Using Airborne Electromagnetic Data
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Talking Logging measurments
Estimating Hydraulic Conductivity with NMR logging in Glacial Aquifers
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Modeling Land Subsidence Using InSAR and Airborne Electromagnetic Data
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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
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Basin Map
Aquifer Recharge and Recovery: Modeling Flow and Transport
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Sattelite Precipitation Map
Correcting TRMM Data
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Basic Project materials photo
Comparing Laboratory and Borehole NMR in Unconsolidated Aquifers
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Imaging Saltwater Intrusion Using Electrical Resistivity Tomography
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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
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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
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satellite
Satellites Used to Link California Arsenic Contamination to Groundwater Pumping
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Linking InSAR data to Aquifer Properties and Seasonal Changes in Head
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Estimating permanent loss of groundwater storage with InSAR
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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
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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
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