Search Results - "Starn, Jeffrey J."

Simulating Water‐Quality Trends in Public‐Supply Wells in Transient Flow Systems by Jeffrey Starn, J, Green, Christopher T, Hinkle, Stephen R, Bagtzoglou, Amvrossios C, Stolp, Bernard J

“…Models need not be complex to be useful. An existing groundwater‐flow model of Salt Lake Valley, Utah, was adapted for use with convolution‐based advective…”
Get full text

Methods for simulating solute breakthrough curves in pumping groundwater wells by Jeffrey Starn, J., Bagtzoglou, Amvrossios C., Robbins, Gary A.

“…In modeling there is always a trade-off between execution time and accuracy. For gradient-based parameter estimation methods, where a simulation model is run…”
Get full text

Predicted uranium and radon concentrations in New Hampshire (USA) groundwater—Using Multi Order Hydrologic Position as predictors by Moore, Richard B., Belitz, Kenneth, Ayotte, Joseph, Arnold, Terri L., Hayes, Laura, Sharpe, Jennifer B., Starn, Jeffrey J.

“…Two radioactive elements, uranium (U) and radon (Rn), which are of potential concern in New Hampshire (NH) groundwater, are investigated. Exceedance…”
Get full text

Accuracy of travel time distribution (TTD) models as affected by TTD complexity, observation errors, and model and tracer selection by Green, Christopher T., Zhang, Yong, Jurgens, Bryant C., Starn, J. Jeffrey, Landon, Matthew K.

“…Analytical models of the travel time distribution (TTD) from a source area to a sample location are often used to estimate groundwater ages and solute…”
Get full text

Metamodels to Bridge the Gap Between Modeling and Decision Support by Fienen, Michael N., Nolan, Bernard T., Feinstein, Daniel T., Starn, J. Jeffrey

Get full text

The effects of numerical-model complexity and observation type on estimated porosity values by Starn, J. Jeffrey, Bagtzoglou, Amvrossios C., Green, Christopher T.

“…The relative merits of model complexity and types of observations employed in model calibration are compared. An existing groundwater flow model coupled with…”
Get full text

Programs for Calibration-Based Monte Carlo Simulation of Recharge Areas by Starn, J. Jeffrey, Bagtzoglou, Amvrossios C.

“…One use of groundwater flow models is to simulate contributing recharge areas to wells or springs. Particle tracking can be used to simulate these recharge…”
Get full text

Uncertainty in simulated groundwater-quality trends in transient flow by Starn, J. Jeffrey, Bagtzoglou, Amvrossios C., Robbins, Gary A.

“…In numerical modeling of groundwater flow, the result of a given solution method is affected by the way in which transient flow conditions and geologic…”
Get full text

Using Atmospheric Tracers to Reduce Uncertainty in Groundwater Recharge Areas by Starn, J. Jeffrey, Bagtzoglou, Amvrossios C, Robbins, Gary A

“…A Monte Carlo‐based approach to assess uncertainty in recharge areas shows that incorporation of atmospheric tracer observations (in this case, tritium…”
Get full text

Prediction Uncertainty in Simulated Groundwater Quality Trends by Starn, J Jeffrey

“…Although about 2 billion people worldwide rely on groundwater for their drinking water, our knowledge of the subsurface is sparse and imperfect. One of the…”
Get full text

Regional oxygen reduction and denitrification rates in groundwater from multi-model residence time distributions, San Joaquin Valley, USA by Green, Christopher T., Jurgens, Bryant C., Zhang, Yong, Starn, J. Jeffrey, Singleton, Michael J., Esser, Bradley K.

“…•Multi-model residence time distribution (RTD) approach for multiple tracers.•Regional O2 reduction and denitrification rates are estimated in RTD…”
Get full text

Prediction Uncertainty in Simulated Groundwater Quality Trends by Starn, J. Jeffrey

“…Although about 2 billion people worldwide rely on groundwater for their drinking water, our knowledge of the subsurface is sparse and imperfect. One of the…”
Get full text