Numerical simulation of aquifer tests, west-central Florida

Yobbi, D.K.; Halford, Keith J.

doi:10.3133/sir20055201

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…Walton (2007) recommends analysis of multi-well aquifer tests through simulation utilizing parameter estimation. Some of the tests conducted since the mid-1990s were analyzed with numerical models (Sepulveda, 2006;Yobbi and Halford, 2008;Gonthier, 2011) that utilize a modifi ed version of MODFLOW 1996 (Harbaugh and McDonald, 1996) called MODOPTIM (Halford, 2006).…”

Section: Types Of Tests and Methods Of Analysismentioning

confidence: 99%

Tabulated Transmissivity and Storage Properties of the Floridan Aquifer System in Florida and Parts of Georgia, South Carolina, and Alabama

Kuniansky¹,

Bellino²

2016

Data Series

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Section: Types Of Tests and Methods Of Analysismentioning

confidence: 99%

Tabulated Transmissivity and Storage Properties of the Floridan Aquifer System in Florida and Parts of Georgia, South Carolina, and Alabama

Kuniansky¹,

Bellino²

2016

Data Series

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“…Aquifer testing provides the most integrated assessment of hydraulic connectivity within complex geologic systems (Yobbi and Halford, 2008). Drawdown in observation wells that penetrate a structural block different from that intersected by the pumping well provides direct evidence of a hydraulic connection.…”

Section: Introductionmentioning

confidence: 99%

“…Aquifer-test data from complexly layered aquifers and confining units frequently are interpreted with numerical models to evaluate hydraulic properties of the local geologic system. Numerical simulations combine aquifer-test data with knowledge of hydrogeologic framework to provide a more accurate characterization of complex groundwater systems than analytical models alone (Yobbi and Halford, 2008;Walton, 2008). Hydraulic properties of geologic structures and the effects of these structures on drawdown behavior can be interpreted from aquifer test results because of the flexibility of numerical models (Renard, 2005).…”

Section: Introductionmentioning

confidence: 99%

Assessing hydraulic connections across a complex sequence of volcanic rocks - Analysis of U-20 WW multiple-well aquifer test, Pahute Mesa, Nevada National Security Site, Nevada

Garcia¹,

Fenelon²,

Halford³

et al. 2011

Scientific Investigations Report

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Groundwater beneath Pahute Mesa flows through a complexly layered sequence of volcanic rock aquifers and confining units that have been faulted into distinct structural blocks. Hydraulic property estimates of rocks and structures in this flow system are necessary to assess radionuclide migration near underground nuclear testing areas. The U.S. Geological Survey (USGS) used a 12 month (October 1, 2008-October 1, 2009) intermittent pumping schedule of well U-20 WW and continuously monitored water levels in observation wells ER-20-6 #3, UE-20bh 1, and U-20bg as a multi-well aquifer test to evaluate hydraulic connections across structural blocks, bulk hydraulic properties of volcanic rocks, and the hydraulic significance of a major fault. Measured water levels were approximated using synthetic water levels generated from an analytical model. Synthetic water levels are a summation of environmental water-level fluctuations and a Theis (1935) transform of the pumping signal from flow rate to water-level change. Drawdown was estimated by summing residual differences between measured and synthetic water levels and the Theis-transformed pumping signal from April to September 2009. Drawdown estimates were used in a three-dimensional numerical model to estimate hydraulic properties of distinct aquifers, confining units, and a major fault. A maximum water-level drawdown of nearly 0.4 foot in well UE-20bh 1, which is more than 1 mile from the pumping well, was detected across a major fault. Drawdown estimates in the observation well nearest to (ER-20-6 #3, less than

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“…Aquifer testing provides the most integrated assessment of hydraulic connectivity in complex geologic systems (Yobbi and Halford, 2008). The aquifer volume investigated increases with the distance between the pumping well and observation wells where drawdown is detected.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulations that combine observed drawdowns from aquifer testing with knowledge of the hydrogeologic framework provide a more accurate characterization of complex groundwater systems than analytical models alone (Walton, 2008;Yobbi and Halford, 2008). The flexibility of numerical models allows for hydraulic characterization of hydrostratigraphic units and structural features and for evaluation of structural effects on drawdown behavior (Renard, 2005).…”

Section: Introductionmentioning

confidence: 99%

Hydraulic characterization of volcanic rocks in Pahute Mesa using an integrated analysis of 16 multiple-well aquifer tests, Nevada National Security Site, 2009–14

Garcia¹,

Jackson²,

Halford³

et al. 2017

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov/.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Garcia, C.A., Jackson, T.R., Halford, K.J., Sweetkind, D.S., Damar, N.A., Fenelon, J.M., and Reiner, S.R., 2017, Hydraulic characterization of volcanic rocks in Pahute Mesa using an Integrated Analysis of 16 multiple-well aquifer tests, Nevada National Security Site, 2009-14: U.S. Geological Survey Scientific Investigations Report 2016-5151, 62 p., https://doi.org/10.3133/sir20165151. ISSN 2328-0328 (online) iii AcknowledgmentsThis report was made possible by funding from the U.S. Department of Energy under Interagency Agreement DE-NA0001654 with the Department of Energy, National Nuclear Security Administration.The authors gratefully acknowledge the U.S. Department of Energy (DOE), Navarro Nevada Environmental Services, LLC., Navarro-Intera, LLC, and Navarro for providing aquifer test data at pumping wells, long-term water-level monitoring data at observation and background wells, and the draft Phase II hydrostratigraphic framework model; Jeffery Wurtz and Daniel Neubauer of Navarro and Jeffery Sanchez of Navarro-Intera, LLC, for data collection and data processing; and Peter Martian of Navarro and Rishi Parashar of the Desert Research Institute for helpful review comments.The authors also gratefully acknowledge Terry L. Miller, Glenn L. Locke, and Gary L. Otto, retired, for data collection and data processing and Shana L. Mashburn and Marshall W. Gannett, all of the U.S. Geological Survey, for helpful review comments. Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).Elevation, as used in this report, refers to distance above the vertical datum. Supplemental Information AbstractAn improved understanding of groundwater flow and radionuclide migration downgradient from underground nuclear-testing areas at Pahute Mesa, Nevada National Security Site, requires accurate subsurface hydraulic characterization. To improve conceptual models of flow and transport in the complex hydrogeologic system beneath Pahute Mesa, the U.S. Geological Survey characterized bulk hydraulic properties of volcanic rocks using an integrated analysis of 16 multiple-well aquifer tests. Single-well aquifer-test analyses provided transmissivity estimates at pumped wells. Transmissivity estimates ranged from less than 1 to about 100,000 square feet per day in Pahute Mesa and the vicinity. Drawdown from multiple-wel...

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Numerical simulation of aquifer tests, west-central Florida

Cited by 5 publications

References 12 publications

Tabulated Transmissivity and Storage Properties of the Floridan Aquifer System in Florida and Parts of Georgia, South Carolina, and Alabama

Tabulated Transmissivity and Storage Properties of the Floridan Aquifer System in Florida and Parts of Georgia, South Carolina, and Alabama

Assessing hydraulic connections across a complex sequence of volcanic rocks - Analysis of U-20 WW multiple-well aquifer test, Pahute Mesa, Nevada National Security Site, Nevada

Hydraulic characterization of volcanic rocks in Pahute Mesa using an integrated analysis of 16 multiple-well aquifer tests, Nevada National Security Site, 2009–14

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