Christian Langevin
Biography
Dr. Christian Langevin is a research hydrologist with the U.S. Geological Survey Earth Systems Modeling Branch in Reston, VA. He began his career with the USGS in 1998 after completing his M.S. and Ph.D. at the University of South Florida in Tampa and his B.S. at the University of Wisconsin at Madison. His first project with the USGS involved quantifying submarine groundwater discharge to a coastal marine estuary. As part of this project, he worked to develop and publish the SEAWAT computer program. Since its first official release in 2002, Dr. Langevin and his colleagues have continued to update SEAWAT and add new capabilities, such as the ability to represent simultaneous solute and heat transport. His present research for the Office of Groundwater centers on development, testing and application of MODFLOW, SEAWAT, and other numerical modeling programs.
BOOK CHAPTERS
Langevin, C.D., 2007. Section 2.1.2. Numerical simulation of submarine groundwater discharge: In Submarine Groundwater, Zektser, I.S., and Dzhamalov, R.G. (eds.), CRC Press.
Langevin, C.D., 2007. Section 4.6. Groundwater discharge to Biscayne Bay, Florida: In Submarine Groundwater, (eds.) I. Zektser and R. Dzhamalov, CRC Press.
Langevin, C.D., Oude Essink, G.H.P., Panday, S., Bakker, M., Prommer, H., Swain, E.D., Jones, W., Beach, M., and Barcelo, M. 2004. Chapter 3, MODFLOW-based tools for simulation of variable-density groundwater flow: In Coastal Aquifer Management: Monitoring, Modeling, and Case Studies, (eds.) A. Cheng and D. Ouazar, Lewis Publishers, p. 49-76.
Obeysekera, J., Kuebler, L., Ahmed, S., Chang, Miao-LI, Engel, V., Langevin, C., Swain, E., and Wan, Y., 2011. Use of Hydrologic and Hydrodynamic Modeling for Ecosystem Restoration. Critical Reviews in Environmental Science and Technology, 41: 6, 447-488
REFEREED ARTICLES
Langevin, C.D., and Zygnerski, M., 2012. Effect of sea-level rise on salt water intrusion near a coastal well field in southeastern Florida. Ground Water, DOI: 10.1111/j.1745-6584.2012.01008.x.
Morway, E.D., Niswonger, R.G., Langevin, C.D., Bailey, R.T., and Healy, R.W., 2012. Modeling variably saturated subsurface solute transport with MODFLOW-UZF and MT3DMS. Ground Water. doi: 10.1111/j.1745-6584.2012.00971.x
Langevin, C.D., and Panday, S., 2012. Future of groundwater modeling. Ground Water 50 no. 3: 334-339. DOI: 10.1111/j.1745-6584.2012.00937.x
Panday, S., and Langevin, C.D., 2012. Improving sub-grid scale accuracy of boundary features in regional finite-difference models. Advances in Water Resources 41: 65-75.
La Licata, I., Langevin, C.D., Dausman, A.M., and Alberti, L., 2011. Effect of tidal fluctuations on transient dispersion of simulated contaminant concentrations in a coastal aquifer. Hydrogeology Journal, Vol. 18, no. 1: 25-38. DOI: 10.1007/s10040-011-0763-9.
Hughes, J.D., Decker, J.D., and Langevin, C.D., 2011. Use of upscaled elevation and surface roughness data in two-dimensional surface water models. Advances in Water Resources, Vol. 34, no. 9: 1151-1164. DOI:10.1016/j.advwatres.2011.02.004.
Herckenrath, D. Langevin, C.D., and Doherty, J., 2011. Predictive uncertainty analysis of a saltwater intrusion model using null-space Monte Carlo. Water Resources Research, Vol. 47, W05504, doi: 10.1029/2010WR009342.
Mulligan, A.E., Langevin, C.D., and Post, V., 2011. Tidal boundary conditions in SEAWAT Ground Water 49: 866-879, DOI: 10.1111/j.1745-6584.2010.00788.x
Dausman, A. M., Doherty, J., Langevin, C. D. and Sukop, M. C., 2010. Quantifying data worth toward reducing predictive uncertainty. Ground Water, 48: 729–740. doi: 10.1111/j.1745-6584.2010.00679.x
Langevin, C. D., Dausman, A. M. and Sukop, M. C., 2010. Solute and heat transport model of the Henry and Hilleke laboratory experiment: Ground Water, 48: 757–770. doi: 10.1111/j.1745-6584.2009.00596.x
Dausman, A.M., Doherty, J., Langevin, C.D., and Dixon, J., 2010. Hypothesis testing of buoyant plume migration using a highly parameterized variable-density groundwater model at a site in Florida, USA. Hydrogeology Journal vol. 18, no. 1: 147-160. DOI: 10.1007/s10040-009-0511-6.
Hughes, J.D., Langevin, C.D., and Brakefield-Goswami, L., 2010. Effect of hypersaline cooling canals on aquifer salinization: Hydrogeology Journal vol. 18, no. 1: 25-38. DOI 10.1007/s10040-009-0502-7.
Langevin, C.D., 2008. Modeling axisymmetric flow and transport: Ground Water vol. 46, no. 4:579-590.
La Licata, I., Langevin, C.D., Dausman, A.M., 2007, Effect of tidal fluctuations on contaminant transfer to the ocean, in Sanford, W., Langevin, C.D., Polemio, M., and Povinec. P., eds., 2007, A new focus on groundwater-seawater interactions: IAHS Publication 312, Oxfordshire, United Kingdom, p. 334-341.
Dausman, A.M., Langevin, C.D., Sukop, M.C., 2007, Simulation of submarine groundwater discharge salinity and temperature variations: implications for remote detection, in Sanford, W., Langevin, C.D., Polemio, M., and Povinec. P., eds., 2007, A new focus on groundwater-seawater interactions: IAHS Publication 312, Oxfordshire, United Kingdom, p. 272-280.
Langevin, C.D., Sanford, W., Polemio, M., and Povinec, P., 2007, Background and summary, in Sanford, W., Langevin, C.D., Polemio, M., and Povinec. P., eds., 2007, A new focus on groundwater-seawater interactions: IAHS Publication 312, Oxfordshire, United Kingdom, p. 3-10.
Langevin, C.D., Lebbe, L., Bakker, M., and Voss, C.I., 2007, Ground Water Readers' Forum: Twentieth salt water intrusion meeting planned for June 23 to 27, 2008, in Naples, Florida. Ground Water 46, no. 6: 657-658.
Swain, E.D., Langevin, C.D., and Wang, J.D., 2008. Utilizing spectral analysis of coastal discharge computed by a numerical model to determine boundary influence. Journal of Coastal Research, vol. 24, no. 6: 1418-1429.
Langevin, C.D., Sanford, W., Polemio, M., and Povinec, P., 2007, Background and summary, in Sanford, W., Langevin, C.D., Polemio, M., and Povinec. P., eds., 2007, A new focus on groundwater-seawater interactions: IAHS Publication 312, Oxfordshire, United Kingdom, p. 3-10.
Dausman, A.M., Langevin, C.D., Sukop, M.C., 2007, Simulation of submarine groundwater discharge salinity and temperature variations: implications for remote detection, in Sanford, W., Langevin, C.D., Polemio, M., and Povinec. P., eds., 2007, A new focus on groundwater-seawater interactions: IAHS Publication 312, Oxfordshire, United Kingdom, p. 272-280.
La Licata, I., Langevin, C.D., Dausman, A.M., 2007, Effect of tidal fluctuations on contaminant transfer to the ocean, in Sanford, W., Langevin, C.D., Polemio, M., and Povinec. P., eds., 2007, A new focus on groundwater-seawater interactions: IAHS Publication 312, Oxfordshire, United Kingdom, p. 334-341.
Thorne, D., Langevin, C.D., and Sukop, M.C., 2006. Addition of simultaneous heat and solute transport and variable fluid viscosity to SEAWAT: Computer and Geosciences vol. 32, 1758-1768.
Langevin, C.D., and Guo, W., 2006. MODFLOW/MT3DMS-based simulation of variable density ground water flow and transport: Ground Water vol. 44, no. 3:339-351.
Langevin, C.D., Swain, E.D., and Wolfert, M.A. 2005. Simulation of integrated surface-water/ground-water flow and salinity for a coastal wetland and adjacent estuary: Journal of Hydrology 314, 212-234.
Mao, X., Prommer, H., Barry, D.A., Langevin, C.D., Panteleit, B., and Li, L., 2006. Three-dimensional model for multi-component reactive transport with variable density groundwater flow: Environmental Modelling & Software vol. 21, no. 5:615-628.
Langevin, C.D., and Bean, D.M., 2005, Software Spotlight/Ground Water Vistas: A graphical user interface for the MODFLOW family of ground water flow and transport models. Ground Water 43, no. 2:1-4.
Bakker, M., Oude Essink, G.H.P., and Langevin, C.D., 2004, The rotating movement of three immiscible fluids - a benchmark problem. Journal of Hydrology 287, 270-278.
Langevin, C.D. 2003. Simulation of submarine ground water discharge to a marine estuary: Biscayne Bay, Florida. Ground Water 41, no. 6: 758-771.
Langevin, C.D. 2003. Stochastic ground water flow simulation with a fracture zone continuum model. Ground Water 41, no. 5: 587-601.
Stewart, M.T., and Langevin, C.D. 2000. Author's Reply. Ground Water 38, no. 1: 6-6.
Stewart, M.T., and Langevin, C.D., 1999. Post Audit of a numerical prediction of wellfield drawdown in a semiconfined aquifer system: Ground Water 37, no. 2:245-252.
Langevin, C.D., Stewart,M.T., and Beaudoin, C.M., 1998. Effects of dredge and fill canals on freshwater resources of small oceanic islands. An example from Big Pine Key, Florida: Ground Water 36, no. 3: 503-513.
PUBLISHED USGS REPORTS
Hughes, J.D., Langevin, C.D., Chartier, K.L., and White, J.T., 2012, Documentation of the Surface-Water Routing (SWR1) Process for modeling surface-water flow with the U.S. Geological Survey Modular Groundwater Model (MODFLOW-2005), U.S. Geological Survey Techniques and Methods 6-A40
Yager, R.M., Misut, P.E., Langevin, C.D., and Parkhurst, D.L., 2009. Brine migration from a flooded salt mine in the Genesee Valley, Livingston County, New York: Geochemical modeling and simulation of variable-density flow: U.S. Geological Survey Professional Paper 1767, 59 p., also available online at http://pubs.usgs.gov/pp/pp1767/.
Dausman, A., Langevin, C.D., Thorne, D., Sukop, M.C., 2009. Six benchmark problems for testing heat and solute transport with variable viscosity using SEAWAT Version 4: U.S. Geological Survey Scientific Investigations Report 2009-5028, 72 p.
Wolfert-Lohmann, M.A., Langevin, C.D., Jones, S.A., Reich, C.D., Wingard, G.L., Kuffner, I.B., and Cunningham, K.J., 2008. U.S. Geological Survey science support strategy for Biscayne National Park and surrounding areas in Southern Florida: U.S. Geological Survey Open-File Report 2007-1288, 47 p.
Langevin, C.D., Thorne, D.T., Jr., Dausman, A.M., Sukop, M.C., and Guo, Weixing, 2007, SEAWAT Version 4: A Computer Program for Simulation of Multi-Species Solute and Heat Transport: U.S. Geological Survey Techniques and Methods Book 6, Chapter A22, 39 p.
Wang, J.D., Swain, E.D., Wolfert, M.A., Langevin, C.D., James, D.E., and Telis, P.A., 2007. Application of FTLOADDS to Simulate Flow, Salinity, and Surface-Water Stage in the Southern Everglades, Florida: U.S. Geological Survey Scientific Investigations Report 2007–5010, 112 p.
Dausman, A.M. and Langevin, C.D. 2005. Movement of the saltwater interface in the Surficial Aquifer System in response to hydrologic stresses and water-management practices, Broward County, Florida: U.S. Geological Survey Scientific Investigations Report 2004-5256.
Swarzenski, P.W., Charette, M., and Langevin, C.D. 2004. An autonomous, electromagnetic seepage meter to study coastal groundwater/surface water exchange: U.S. Geological Survey Open-File Report 2004-1369.
Langevin, C.D., Swain, E.D., and Wolfert, M.A. 2004, Simulation of integrated surface-water/ground-water flow and salinity for a coastal wetland and adjacent estuary, U.S. Geological Survey Open-File Report 2004-1097.
Langevin, C.D., Swain, E.D., Wang, J.D., Wolfert, M.A., Schaffranek, R.W., and Riscassi, A.L. 2004. Development of coastal flow and transport models in support of Everglades restoration: U.S. Geological Survey Fact Sheet 2004-3130.
Wolfert, M.A., Langevin, C.D., and Swain, E.D. 2004. Assigning boundary conditions to the Southern Inland and Coastal Systems (SICS) model using results from the South Florida Water Management Model (SFWMM): U.S. Geological Survey Open-File Report 2004-1195, 30 p.
Langevin, C.D., Shoemaker, W.B., and Guo, W. 2003. MODFLOW-2000, the U.S. Geological Survey modular ground-water model—Documentation of the SEAWAT-2000 version with the variable-density flow process (VDF) and the integrated MT3DMS Transport Process (IMT): U.S. Geological Survey Open-File Report 03-426, 43 p.
Guo, Weixing, and Langevin, C.D. 2002. User’s guide to SEAWAT: A computer program for simulation of three-dimensional variable-density ground-water flow: U.S. Geological Survey Techniques of Water Resources Investigations Book 6, Chapter A7, 79 p.
Guo, Weixing, and Langevin, C.D. 2002. User’s guide to SEAWAT: A computer program for simulation of three-dimensional variable-density ground-water flow: U.S. Geological Survey Open-File Report 01-434, 79 p.
Langevin, C.D. 2001. Simulation of ground-water discharge to Biscayne Bay, Southeastern Florida: U.S. Geological Survey Water-Resources Investigations Report 00-4251, 127 p.
PROCEEDINGS
Panday, S., Niswonger, R.G., Langevin, C.D., Ibaraki, M., 2011. An un-structured grid version of MODFLOW. In MODFLOW and More 2011: Integrated Hydrologic Modeling – Conference Proceedings, June 5 – 8, 2011, International Groundwater Modeling Center, Colorado School of Mines.
Langevin, C.D., Panday, S., Niswonger, R.G., Hughes, J.D., Ibaraki, M., 2011. Local grid refinement with an unstructured grid version of MODFLOW. In MODFLOW and More 2011: Integrated Hydrologic Modeling – Conference Proceedings, June 5 – 8, 2011, International Groundwater Modeling Center, Colorado School of Mines.
Schaars, F.W., Bakker, M., Hughes, J.D., Dausman, A.M., Langevin, C.D., 2011. Modeling regional seawater intrusion with MODFLOW2005 and the SWI Package. In MODFLOW and More 2011: Integrated Hydrologic Modeling – Conference Proceedings, June 5 – 8, 2011, International Groundwater Modeling Center, Colorado School of Mines.
Hughes, J.D., White, J.T., Brakefield, L.K., Walsh, V.M., Langevin, C.D., 2011. Simulating surface-water control structures and surface-water/groundwater interactions in Miami-Dade County, Florida, using the Surface-Water Routing Process for MODFLOW-2005. In MODFLOW and More 2011: Integrated Hydrologic Modeling – Conference Proceedings, June 5 – 8, 2011, International Groundwater Modeling Center, Colorado School of Mines.
Brakefield, L.K., Langevin, C.D., and Hughes, J.D., 2011. Estimating well-field contributing areas in the presence of lakes using an unconstrained Monte-Carlo analysis. In MODFLOW and More 2011: Integrated Hydrologic Modeling – Conference Proceedings, June 5 – 8, 2011, International Groundwater Modeling Center, Colorado School of Mines.
Provost, A.M. and Langevin, C.D., 2011. Effect of the difference between water-table elevation and hydraulic head on simulation of unconfined aquifers using MODFLOW. In MODFLOW and More 2011: Integrated Hydrologic Modeling – Conference Proceedings, June 5 – 8, 2011, International Groundwater Modeling Center, Colorado School of Mines.
Ibaraki, M., Panday, S., Niswonger, R.G., and Langevin, C.D., 2011. Improvement of performance of MODFLOW: XMD matrix solver package. In MODFLOW and More 2011: Integrated Hydrologic Modeling – Conference Proceedings, June 5 – 8, 2011, International Groundwater Modeling Center, Colorado School of Mines.
White, J.T., Langevin, C.D., and Hughes, J.D. 2010. Evaluating the effect of Tikhonov regularization schemes on predictions in a variable-density groundwater model. SWIM21 – 21st Salt Water Intrusion Meeting Proceedings Book, Ponta Delgada, Azores, Portugal, June 21-26, 2010.
Hughes, J.D., White, J.T., and Langevin, C.D. 2010. Use of time series and harmonic constituents of tidal propagation to enhance estimation of coastal aquifer heterogeneity. SWIM21 – 21st Salt Water Intrusion Meeting Proceedings Book, Ponta Delgada, Azores, Portugal, June 21-26, 2010.
Dausman, A.M., Langevin, C.D., Bakker, M., and Schaars, F. 2010. A comparison between SWI and SEAWAT – the importance of dispersion, inversion, and vertical anisotropy. SWIM21 – 21st Salt Water Intrusion Meeting Proceedings Book, Ponta Delgada, Azores, Portugal, June 21-26, 2010.
Langevin, C.D., Zygnerski, M.R., White, J.T., and Hughes, J.D. 2010. Effect of sea-level rise on future coastal groundwater resources in southern Florida, USA. SWIM21 – 21st Salt Water Intrusion Meeting Proceedings Book, Ponta Delgada, Azores, Portugal, June 21-26, 2010.
Dausman, A.M., Doherty, J., and Langevin, C.D., 2009. Creative use of pilot points to address site and regional scale heterogeneity in a variable-density model. The PEST conference 2009, November 2-4, 2009, Potomac, Maryland.
Herckenrath, D. Langevin, C.D., and Doherty, J., 2009. Application of a null space Monte Carlo method to a salt water intrusion model. The PEST conference 2009, November 2-4, 2009, Potomac, Maryland.
Brakefield, L., Langevin, C.D., Use of unconstrained Monte Carlo methods to determine effects of uncertainty in hydraulic conductivity and effective porosity on well-field contributing areas. The PEST conference 2009, November 2-4, 2009, Potomac, Maryland.
Langevin, C.D., and Hughes, J.D., 2009. Effect of numerical dispersion as a source of structural noise in the calibration of a highly parameterized saltwater intrusion model. The PEST conference 2009, November 2-4, 2009, Potomac, Maryland.
Brakefield, L.K., Abarca, E., Langevin, C.D., and Clement, T.P., 2008.Physical and numerical modeling of buoyant groundwater plumes: In Proceedings of the 20th Salt Water Intrusion Meeting, June 23-27, 2008, Naples, Florida, U.S.A.
La Licata, I., Langevin, C.D., Dausman, A.M., and Alberti, L., 2008. Tidal effects on transient dispersion of simulated contaminant concentrations in coastal aquifers: In Proceedings of the 20th Salt Water Intrusion Meeting, June 23-27, 2008, Naples, Florida, U.S.A.
Zygnerski, M.R., and Langevin, C.D., 2008. Quantifying effects of natural and anthropogenic stresses on long-term saltwater intrusion in a coastal aquifer: In Proceedings of the 20th Salt Water Intrusion Meeting, June 23-27, 2008, Naples, Florida, U.S.A.
Dausman, A.M., Langevin, C.D., Sukop, M.C., and Walsh, V., 2008. Saltwater/freshwater interface movement in response to deep-well injection in a coastal aquifer: In Proceedings of the 20th Salt Water Intrusion Meeting, June 23-27, 2008, Naples, Florida, U.S.A.
Bittner, L.D., Richardson, E., Langevin, C.D., England, S.M., and Stevens, G.T., 2008. Using density-dependent numerical models to evaluate regional groundwater flow patterns in South Florida: In Proceedings of The World Environmental & Water Resources Congress, May 12-16, 2008, Honolulu, Hawaii.
Sukop, M.C., S. Anwar, J.S. Lee, K.J. Cunningham, and Langevin, C.D., 2008. Modeling ground-water flow and solute transport in karst with Lattice Boltzmann Methods: Proceedings of the U.S. Geological Survey Karst Interest Group Workshop, May 27-29, 2008, Bowling Green, Kentucky, Western Kentucky University Campus. http://pubs.usgs.gov/sir/2008/5023/32sukop.htm.
Dausman, A., Doherty, J., Langevin, C.D., and Sukop, M.C., 2008. Quantifying data contributions toward reducing predictive uncertainty in a variable-density flow and solute/heat transport model: In MODFLOW and More 2008: Ground Water and Public Policy - Conference Proceedings, Golden, Colorado, May 19-21, 2008.
Langevin, C.D., Dausman, A.M., Thorne, D., and Sukop, M.C., 2008. Modeling solute and heat transport with SEAWAT: In MODFLOW and More 2008: Ground Water and Public Policy - Conference Proceedings, Golden, Colorado, May 19-21, 2008.
Zygnerski, M.R., and Langevin, C.D., 2007. Long-term saltwater intrusion in a coastal limestone aquifer: quantifying effects of natural and anthropogenic stress: In Proceedings of the 3rd International Symposium on Technology of Seawater Intrusion into Coastal Aquifers, Almeria, Spain, October 16-19, 2007.
Langevin, C.D., and Zygnerski, M., 2006. Axisymmetric simulation of aquifer storage and recovery with SEAWAT and the Sea Water Intrusion (SWI) Package for MODFLOW: In Proceedings of MODFLOW and More 2006, Managing Ground-Water Systems, Golden, Colorado, May 22-24, 2006.
Thorne, D., Langevin, C.D., and Sukop, M.C., 2006. MODFLOW/MT3DMS-based simulation of variable-density groundwater flow with simultaneous heat and solute transport: In Proceedings of the 2006 Conference on Computational Methods in Water Resources XVI, Copenhagen, Denmark, June 19-22, 2006.
Langevin, C.D. and Dausman, A.M. 2005. Numerical simulation of saltwater intrusion in response to sea-level rise: In Proceedings of the World Water & Environmental Resources Congress, Impacts of Global Climate Change, American Society of Civil Engineers, Anchorage, Alaska, May 15-19, 2005.
Langevin, C.D., Swain, E.D., and Wolfert, M.A. 2002. Numerical simulation of integrated surface-water/ground-water flow and solute transport in the southern Everglades in Florida. Second Federal Interagency Hydrologic Modeling Conference, Las Vegas, Nevada, July 28 – August 1, 2002.
Dausman, A., and Langevin, C.D. 2002. Representing hydrodynamic dispersion in saltwater intrusion models of different temporal scales. American Water Resources Association's Spring Specialty Conference on "Coastal Water Resources", May 13-15, 2002, New Orleans, Louisiana.
Swain, E.D., Langevin, C.D., and Wolfert, M.A. 2002. Cooperative linking of numerical models for coastal wetland planning. American Water Resources Association's Spring Specialty Conference on "Coastal Water Resources," May 13-15, 2002, New Orleans, Louisiana.
Guo, Weixing, Langevin, C.D., and Bennett, G.D. 2001. Improvements to SEAWAT and application of the variable-density modeling program in southern Florida, in Poeter, E., and others, MODFLOW 2001 and Other Modeling Odysseys Conference, Colorado School of Mines, Golden, Colorado, v. 2, p. 621-627.
Science and Products
Creative use of pilot points to address site and regional scale heterogeneity in a variable-density model
Pilot points for parameter estimation were creatively used to address heterogeneity at both the well field and regional scales in a variable-density groundwater flow and solute transport model designed to test multiple hypotheses for upward migration of fresh effluent injected into a highly transmissive saline carbonate aquifer. Two sets of pilot...
Dausman, Alyssa M.; Doherty, John; Langevin, Christian D.
Application of SEAWAT to select variable-density and viscosity problems
SEAWAT is a combined version of MODFLOW and MT3DMS, designed to simulate three-dimensional, variable-density, saturated groundwater flow. The most recent version of the SEAWAT program, SEAWAT Version 4 (or SEAWAT_V4), supports equations of state for fluid density and viscosity. In SEAWAT_V4, fluid density can be calculated as a function of one or...
Dausman, Alyssa M.; Langevin, Christian D.; Thorne, Danny T.; Sukop, Michael C. Evaluating the effect of Tikhonov regularization schemes on predictions in a variable‐density groundwater model
Calibration of highly‐parameterized numerical models typically requires explicit Tikhonovtype regularization to stabilize the inversion process. This regularization can take the form of a preferred parameter values scheme or preferred relations between parameters, such as the preferred equality scheme. The resulting parameter distributions...
White, Jeremy T.; Langevin, Christian D.; Hughes, Joseph D. Use of time series and harmonic constituents of tidal propagation to enhance estimation of coastal aquifer heterogeneity
A synthetic two‐dimensional model of a horizontally and vertically heterogeneous confined coastal aquifer system, based on the Upper Floridan aquifer in south Florida, USA, subjected to constant recharge and a complex tidal signal was used to generate 15‐minute water‐level data at select locations over a 7‐day simulation period. ...
Hughes, Joseph D.; White, Jeremy T.; Langevin, Christian D. Effect of numerical dispersion as a source of structural noise in the calibration of a highly parameterized saltwater intrusion model
A model with a small amount of numerical dispersion was used to represent saltwater 7 intrusion in a homogeneous aquifer for a 10-year historical calibration period with one 8 groundwater withdrawal location followed by a 10-year prediction period with two groundwater 9 withdrawal locations. Time-varying groundwater concentrations at arbitrary...
Langevin, Christian D.; Hughes, Joseph D. Effect of hypersaline cooling canals on aquifer salinization
The combined effect of salinity and temperature on density-driven convection was evaluated in this study for a large (28 km2) cooling canal system (CCS) at a thermoelectric power plant in south Florida, USA. A two-dimensional cross-section model was used to evaluate the effects of hydraulic heterogeneities, cooling canal salinity, heat...
Hughes, Joseph D.; Langevin, Christian D.; Brakefield-Goswami, Linzy
SEAWAT: A Computer Program for Simulation of Variable-Density Groundwater Flow and Multi-Species Solute and Heat Transport
SEAWAT is a MODFLOW-based computer program designed to simulate variable-density groundwater flow coupled with multi-species solute and heat transport. The program has been used for a wide variety of groundwater studies including saltwater intrusion in coastal aquifers, aquifer storage and recovery in brackish limestone aquifers, and brine...
Langevin, Christian D.
Brine Migration from a Flooded Salt Mine in the Genesee Valley, Livingston County, New York: Geochemical Modeling and Simulation of Variable-Density Flow
The Retsof salt mine in upstate New York was flooded from 1994 to 1996 after two roof collapses created rubble chimneys in overlying bedrock that intersected a confined aquifer in glacial sediments. The mine now contains about 60 billion liters of saturated halite brine that is slowly being displaced as the weight of overlying sediments causes the...
Yager, Richard M.; Misut, Paul E.; Langevin, Christian D.; Parkhurst, David L.
U.S. Geological Survey Science Support Strategy for Biscayne National Park and Surrounding Areas in Southeastern Florida
The U.S. Geological Survey conducts a wide range of research in and around the Biscayne National Park region of southern Florida. This research encompasses the biologic, ecologic, meteorologic, geologic, and hydrologic components of the system, including water-quality analyses, ground-water modeling, hydrogeologic-data collection, ecologic-habitat...
Wolfert-Lohmann, Melinda A.; Langevin, Christian D.; Jones, Sonya A.; Reich, Chris D.; Wingard, Georgina L.; Kuffner, Ilsa B.; Cunningham, Kevin J.
SEAWAT Version 4: A Computer Program for Simulation of Multi-Species Solute and Heat Transport
The SEAWAT program is a coupled version of MODFLOW and MT3DMS designed to simulate three-dimensional, variable-density, saturated ground-water flow. Flexible equations were added to the program to allow fluid density to be calculated as a function of one or more MT3DMS species. Fluid density may also be calculated as a function of fluid pressure....
Langevin, Christian D.; Thorne, Daniel T.; Dausman, Alyssa M.; Sukop, Michael C.; Guo, Weixing
Application of FTLOADDS to Simulate Flow, Salinity, and Surface-Water Stage in the Southern Everglades, Florida
The Comprehensive Everglades Restoration Plan requires numerical modeling to achieve a sufficient understanding of coastal freshwater flows, nutrient sources, and the evaluation of management alternatives to restore the ecosystem of southern Florida. Numerical models include a regional water-management model to represent restoration changes to the...
Wang, John D.; Swain, Eric D.; Wolfert, Melinda A.; Langevin, Christian D.; James, Dawn E.; Telis, Pamela A. Movement of the saltwater interface in the surficial aquifer system in response to hydrologic stresses and water-management practices, Broward County, Florida
A study was conducted to evaluate the relation between water-level fluctuations and saltwater intrusion in Broward County, Florida. The objective was achieved through data collection at selected wells in Broward County and through the development of a variable-density ground-water flow model. The numerical model is representative of many locations...
Dausman, Alyssa M.; Langevin, Christian D.