Tracy Nishikawa (Former Employee)
Science and Products
Filter Total Items: 38
Decoupled application of the integrated hydrologic model, GSFLOW, to estimate agricultural irrigation in the Santa Rosa Plain, California Decoupled application of the integrated hydrologic model, GSFLOW, to estimate agricultural irrigation in the Santa Rosa Plain, California
No abstract available.
Authors
Joseph A. Hevesi, Linda R. Woolfenden, Richard G. Niswonger, R. Steven Regan, Tracy Nishikawa
A framework for sea level rise vulnerability assessment for southwest U.S. military installations A framework for sea level rise vulnerability assessment for southwest U.S. military installations
We describe an analysis framework to determine military installation vulnerabilities under increases in local mean sea level as projected over the next century. The effort is in response to an increasing recognition of potential climate change ramifications for national security and recommendations that DoD conduct assessments of the impact on U.S. military installations of climate...
Authors
B. Chadwick, Reinhard Flick, J. Helly, Tracy Nishikawa, Fang Wang Pei, W. O'Reilly, R. Guza, Peter Bromirski, A. Young, W. Crampton, B. Wild, I. Canner
Optimal pump and recharge management model for nitrate removal in the Warren groundwater basin, California Optimal pump and recharge management model for nitrate removal in the Warren groundwater basin, California
The town of Yucca Valley located in the southwest part of the Mojave Desert in southern California relies on groundwater pumping from the Warren groundwater basin as its sole source of water supply. This significant dependency has resulted in a large imbalance between groundwater pumpage and natural recharge, causing groundwater levels in the basin to decline more than 90 m from the late...
Authors
Yung-Chia Chiu, Tracy Nishikawa, William W.-G. Yeh
Arsenic management through well modification and simulation Arsenic management through well modification and simulation
Arsenic concentrations can be managed with a relatively simple strategy of grouting instead of completely destroying a selected interval of well. The strategy of selective grouting was investigated in Antelope Valley, California, where groundwater supplies most of the water demand. Naturally occurring arsenic typically exceeds concentrations of 10 (mu or u)g/L in the water produced from...
Authors
Keith J. Halford, Christina L. Stamos, Tracy Nishikawa, Peter Martin
Development of an objective‐oriented groundwater model for conjunctive‐use planning of surface water and groundwater Development of an objective‐oriented groundwater model for conjunctive‐use planning of surface water and groundwater
In this paper we construct an objective‐oriented model for conjunctive‐use planning of surface water and groundwater for the Warren groundwater basin in southern California. The goal of conjunctive‐use planning is to decrease high‐nitrate concentration while maintaining groundwater levels at desired elevations and meeting water demand. We formulate a management problem that minimizes the...
Authors
Yung-Chia Chiu, Ne-Zheng Sun, Tracy Nishikawa, William W.-G. Yeh
Stratigraphic controls on seawater intrusion and implications for groundwater management, Dominguez Gap area of Los Angeles, California, USA Stratigraphic controls on seawater intrusion and implications for groundwater management, Dominguez Gap area of Los Angeles, California, USA
Groundwater pumping has led to extensive water-level declines and seawater intrusion in coastal Los Angeles, California (USA). A SUTRA-based solute-transport model was developed to test the hydraulic implications of a sequence-stratigraphic model of the Dominguez Gap area and to assess the effects of water-management scenarios. The model is two-dimensional, vertical and follows an...
Authors
Tracy Nishikawa, Adam J. Siade, Eric G. Reichard, Daniel J. Ponti, A.G. Canales, T.A. Johnson
Science and Products
Filter Total Items: 38
Decoupled application of the integrated hydrologic model, GSFLOW, to estimate agricultural irrigation in the Santa Rosa Plain, California Decoupled application of the integrated hydrologic model, GSFLOW, to estimate agricultural irrigation in the Santa Rosa Plain, California
No abstract available.
Authors
Joseph A. Hevesi, Linda R. Woolfenden, Richard G. Niswonger, R. Steven Regan, Tracy Nishikawa
A framework for sea level rise vulnerability assessment for southwest U.S. military installations A framework for sea level rise vulnerability assessment for southwest U.S. military installations
We describe an analysis framework to determine military installation vulnerabilities under increases in local mean sea level as projected over the next century. The effort is in response to an increasing recognition of potential climate change ramifications for national security and recommendations that DoD conduct assessments of the impact on U.S. military installations of climate...
Authors
B. Chadwick, Reinhard Flick, J. Helly, Tracy Nishikawa, Fang Wang Pei, W. O'Reilly, R. Guza, Peter Bromirski, A. Young, W. Crampton, B. Wild, I. Canner
Optimal pump and recharge management model for nitrate removal in the Warren groundwater basin, California Optimal pump and recharge management model for nitrate removal in the Warren groundwater basin, California
The town of Yucca Valley located in the southwest part of the Mojave Desert in southern California relies on groundwater pumping from the Warren groundwater basin as its sole source of water supply. This significant dependency has resulted in a large imbalance between groundwater pumpage and natural recharge, causing groundwater levels in the basin to decline more than 90 m from the late...
Authors
Yung-Chia Chiu, Tracy Nishikawa, William W.-G. Yeh
Arsenic management through well modification and simulation Arsenic management through well modification and simulation
Arsenic concentrations can be managed with a relatively simple strategy of grouting instead of completely destroying a selected interval of well. The strategy of selective grouting was investigated in Antelope Valley, California, where groundwater supplies most of the water demand. Naturally occurring arsenic typically exceeds concentrations of 10 (mu or u)g/L in the water produced from...
Authors
Keith J. Halford, Christina L. Stamos, Tracy Nishikawa, Peter Martin
Development of an objective‐oriented groundwater model for conjunctive‐use planning of surface water and groundwater Development of an objective‐oriented groundwater model for conjunctive‐use planning of surface water and groundwater
In this paper we construct an objective‐oriented model for conjunctive‐use planning of surface water and groundwater for the Warren groundwater basin in southern California. The goal of conjunctive‐use planning is to decrease high‐nitrate concentration while maintaining groundwater levels at desired elevations and meeting water demand. We formulate a management problem that minimizes the...
Authors
Yung-Chia Chiu, Ne-Zheng Sun, Tracy Nishikawa, William W.-G. Yeh
Stratigraphic controls on seawater intrusion and implications for groundwater management, Dominguez Gap area of Los Angeles, California, USA Stratigraphic controls on seawater intrusion and implications for groundwater management, Dominguez Gap area of Los Angeles, California, USA
Groundwater pumping has led to extensive water-level declines and seawater intrusion in coastal Los Angeles, California (USA). A SUTRA-based solute-transport model was developed to test the hydraulic implications of a sequence-stratigraphic model of the Dominguez Gap area and to assess the effects of water-management scenarios. The model is two-dimensional, vertical and follows an...
Authors
Tracy Nishikawa, Adam J. Siade, Eric G. Reichard, Daniel J. Ponti, A.G. Canales, T.A. Johnson