Estimates of ground-water discharge as determined from measurements of evapotranspiration, Ash Meadows area, Nye County, Nevada

Laczniak, Randell J.; DeMeo, Guy A.; Reiner, Steven R.; Smith, J. LaRue; Nylund, Walter E.

doi:10.2172/750059

Cited by 46 publications

(47 citation statements)

References 31 publications

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“…The combination of the conceptual model of flow within the basin and the IT (1999b) conceptual model of flow into the basin was found to be consistent with the data during the development of the Phase II CAI flow models of the Frenchman Flat groundwater system. Thus, both conceptual models could be honored based on the Phase II CAI data.…”

Section: Frenchman Flat Groundwater Flowsupporting

confidence: 70%

“…The data and interpretations that form the basis for conceptual and numerical models of the Frenchman Flat flow system have been developed based on hydraulic data collected intermittently for more than 50 years during various investigations (e.g., Winograd and Pearson, 1976;1999b;SNJV, 2004cSNJV, , 2005bSNJV, , 2006NNES, 2010). Interpretations of new data collected during the Phase II CAI confirm many of the basic elements of the Frenchman Flat flow system first recognized as early as the 1970s.…”

Section: Frenchman Flat Groundwater Flowmentioning

confidence: 99%

“…The observed flat hydraulic gradients within Frenchman Flat, combined with data from other areas of the NTS consistent with low or moderate permeability of alluvium, support the inference that the lateral and vertical groundwater flow through the basin-filling alluvium and tuffs was relatively small. A later conceptual model proposed by IT (1999b) suggested that semiperched groundwater in the alluvial and volcanic aquifers of Frenchman Flat was sustained by groundwater inflow from the CP basin that leaks across the Cane Spring fault (IT, 1999b). Leakage of groundwater from the CP basin into Frenchman Flat was considered to result in groundwater flow directions in Frenchman Flat that were generally northwest to southeast.…”

Section: Frenchman Flat Groundwater Flowmentioning

confidence: 99%

See 2 more Smart Citations

Phase II Documentation Overview of Corrective Action Unit 98: Frenchman Flat, Nevada Test Site, Nye County, Nevada, Revision 1

Ruskauff¹

2010

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Section: Frenchman Flat Groundwater Flowsupporting

confidence: 70%

Section: Frenchman Flat Groundwater Flowmentioning

confidence: 99%

Section: Frenchman Flat Groundwater Flowmentioning

confidence: 99%

See 1 more Smart Citation

Phase II Documentation Overview of Corrective Action Unit 98: Frenchman Flat, Nevada Test Site, Nye County, Nevada, Revision 1

Ruskauff¹

2010

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“…Here, the evaporative flux was estimated from the vegetated corridor along the ditch and in the playa at the CAMBRIC site. Potential evaporation estimates based on elevation (Shevenell, 1996) and field measurements of actual ET from riparian vegetation (Devitt et al, 1998;Laczniak et al, 1999) were used to calibrate a simple evaporation coefficient model. The effect of incorporating evaporation on the timing and magnitude of recharge to the water table is determined using the HYDRUS-1D model (Simunek et al, 2005).…”

Section: -8mentioning

confidence: 99%

Phase II Transport Model of Corrective Action Unit 98: Frenchman Flat, Nevada Test Site, Nye County, Nevada, Revision 1

Ruskuaff¹

2010

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“…It is acknowledged that the results from outflow methods currently employed in Nevada (Maxey and Eakin, 1949;D=Agnese et al, 1997;Laczniak et al, 1999) contain significant uncertainty and would be complemented by a simultaneously conducted tracer-based aquiferresponse method. The objective of this study was to further develop an improved aquiferresponse method for determining recharge based on the chloride mass-balance approach.…”

Section: Objective and Scopementioning

confidence: 99%

Reconnaissance Estimates of Recharge Based on an Elevation-dependent Chloride Mass-balance Approach

Russell¹,

Minor²

2002

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Significant uncertainty is associated with efforts to quantity recharge in arid regions such as southern Nevada. However, accurate estimates of groundwater recharge are necessary to understanding the long-term sustainability of groundwater resources and predictions of groundwater flow rates and directions. Currently, the most widely accepted method for estimating recharge in southern Nevada is the Maxey and Eakin method. This method has been applied to most basins within Nevada and has been independently verified as a reconnaissancelevel estimate of recharge through several studies. Recharge estimates derived from the Maxey and Eakin and other recharge methodologies ultimately based upon measures or estimates of groundwater discharge (outflow methods) should be augmented by a tracer-based aquiferresponse method. The objective of this study was to improve an existing aquifer-response method that was based on the chloride mass-balance approach. Improvements were designed to incorporate spatial variability within recharge areas (rather than recharge as a lumped parameter), develop a more defendable lower limit of recharge, and differentiate local recharge from recharge emanating as interbasin flux.Seventeen springs, located in the Sheep Range, Spring Mountains, and on the Nevada Test Site were sampled during the course of this study and their discharge was measured. The chloride and bromide concentrations of the springs were determined. Discharge and chloride concentrations from these springs were compared to estimates provided by previously published reports. A literature search yielded previously published estimates of chloride flux to the land surface.36 Cl/Cl ratios and discharge rates of the three largest springs in the Amargosa Springs discharge area were compiled from various sources. This information was utilized to determine an effective chloride concentration for recharging precipitation and its associated uncertainty via Monte Carlo simulations. Previously developed isohyetal maps were utilized to determine the mean and standard deviation of precipitation within the area. A digital elevation model was obtained to provide elevation information. A geologic model was obtained to provide the spatial distribution of alluvial formations. Both were used to define the lower limit of recharge. In addition, 40 boreholes located in alluvial sediments were drilled and sampled in an attempt to support the argument that the areal distribution of alluvial sediments can be used to define a zone of negligible recharge. The data were compiled in a geographic information system and used in a Monte Carlo analysis to determine recharge occurring within the study area. Results of the analysis yielded estimates of the mean and standard deviation of recharge occurring within the study area (28.168 x10 6 m 3 yr -1 and 7.008 x10 6 m 3 yr -1 , and 26.838 x10 6 m 3 yr -1 and 6.928 x10 6 m 3 yr -1 ) for two sets of simulations using alternate definitions of the lower limit of recharge. A sensitivity analysis determined the r...

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Estimates of ground-water discharge as determined from measurements of evapotranspiration, Ash Meadows area, Nye County, Nevada

Cited by 46 publications

References 31 publications

Phase II Documentation Overview of Corrective Action Unit 98: Frenchman Flat, Nevada Test Site, Nye County, Nevada, Revision 1

Phase II Documentation Overview of Corrective Action Unit 98: Frenchman Flat, Nevada Test Site, Nye County, Nevada, Revision 1

Phase II Transport Model of Corrective Action Unit 98: Frenchman Flat, Nevada Test Site, Nye County, Nevada, Revision 1

Reconnaissance Estimates of Recharge Based on an Elevation-dependent Chloride Mass-balance Approach

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