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
MODFLOW–USG version 1: An unstructured grid version of MODFLOW for simulating groundwater flow and tightly coupled processes using a control volume finite-difference formulation
A new version of MODFLOW, called MODFLOW–USG (for UnStructured Grid), was developed to support a wide variety of structured and unstructured grid types, including nested grids and grids based on prismatic triangles, rectangles, hexagons, and other cell shapes. Flexibility in grid design can be used to focus resolution along rivers and around wells...
Panday, Sorab; Langevin, Christian D.; Niswonger, Richard G.; Ibaraki, Motomu; Hughes, Joseph D.
Estimation of capture zones and drawdown at the Northwest and West Well Fields, Miami-Dade County, Florida, using an unconstrained Monte Carlo analysis: recent (2004) and proposed conditions
Travel-time capture zones and drawdown for two production well fields, used for drinking-water supply in Miami-Dade County, southeastern Florida, were delineated by the U.S Geological Survey using an unconstrained Monte Carlo analysis. The well fields, designed to supply a combined total of approximately 250 million gallons of water per day, pump...
Brakefield, Linzy K.; Hughes, Joseph D.; Langevin, Christian D.; Chartier, Kevin
Modeling variably saturated subsurface solute transport with MODFLOW-UZF and MT3DMS
The MT3DMS groundwater solute transport model was modified to simulate solute transport in the unsaturated zone by incorporating the unsaturated-zone flow (UZF1) package developed for MODFLOW. The modified MT3DMS code uses a volume-averaged approach in which Lagrangian-based UZF1 fluid fluxes and storage changes are mapped onto a fixed grid....
Morway, Eric D.; Niswonger, Richard G.; Langevin, Christian D.; Bailey, Ryan T.; Healy, Richard W.
Documentation of the Surface-Water Routing (SWR1) Process for modeling surface-water flow with the U.S. Geological Survey Modular Ground-Water Model (MODFLOW-2005)
A flexible Surface-Water Routing (SWR1) Process that solves the continuity equation for one-dimensional and two-dimensional surface-water flow routing has been developed for the U.S. Geological Survey three-dimensional groundwater model, MODFLOW-2005. Simple level- and tilted-pool reservoir routing and a diffusive-wave approximation of the Saint-...
Hughes, Joseph D.; Langevin, Christian D.; Chartier, Kevin L.; White, Jeremy T.
Simulated flow of groundwater and brine from a flooded salt mine in Livingston County, New York, and effects of remedial pumping on an overlying aquifer
Two ceiling collapses in the Retsof salt mine near Geneseo in upstate New York in spring 1994 resulted in the upward propagation of two columns of rubble through 600 feet of overlying shale and carbonate bedrock. This upward propagation formed a hydraulic connection between the lower confined aquifer (LCA) and the mine and allowed water from the...
Yager, Richard M.; Miller, Todd S.; Kappel, William M.; Misut, Paul E.; Langevin, Christian D.; Parkhurst, David L.; deVries, M. Peter Future of groundwater modeling
With an increasing need to better manage water resources, the future of groundwater modeling is bright and exciting. However, while the past can be described and the present is known, the future of groundwater modeling, just like a groundwater model result, is highly uncertain and any prediction is probably not going to be entirely representative...
Langevin, Christian D.; Panday, Sorab Improving sub-grid scale accuracy of boundary features in regional finite-difference models
As an alternative to grid refinement, the concept of a ghost node, which was developed for nested grid applications, has been extended towards improving sub-grid scale accuracy of flow to conduits, wells, rivers or other boundary features that interact with a finite-difference groundwater flow model. The formulation is presented for correcting the...
Panday, Sorab; Langevin, Christian D. Effect of the difference between water-table elevation and hydraulic head on simulation of unconfined aquifers using MODFLOW
Provost, Alden M.; Langevin, Christian D. Predictive uncertainty analysis of a saltwater intrusion model using null-space Monte Carlo
Because of the extensive computational burden and perhaps a lack of awareness of existing methods, rigorous uncertainty analyses are rarely conducted for variable-density flow and transport models. For this reason, a recently developed null-space Monte Carlo (NSMC) method for quantifying prediction uncertainty was tested for a synthetic saltwater...
Herckenrath, Daan; Langevin, Christian D.; Doherty, John Effect of tidal fluctuations on transient dispersion of simulated contaminant concentrations in coastal aquifers
Variable-density groundwater models require extensive computational resources, particularly for simulations representing short-term hydrologic variability such as tidal fluctuations. Saltwater-intrusion models usually neglect tidal fluctuations and this may introduce errors in simulated concentrations. The effects of tides on simulated...
La Licata, Ivana; Langevin, Christian D.; Dausman, Alyssa M.; Alberti, Luca A comparison between SWI and SEAWAT: the importance of dispersion, inversion and vertical anisotropy
SWI and SEAWAT are both computer codes designed to model variable-density systems. One of the options in SWI is to model Dupuit interface flow, where freshwater and seawater are separated by an interface. In this paper we compare seawater intrusion model results of SWI to model results of SEAWAT, which simulates full variable-density flow and...
Dausman, Alyssa M.; Langevin, Christian D.; Bakker, Mark; Schaars, Frans Effect of sea-level rise on future coastal groundwater resources in southern Florida, USA
An existing variable‐density groundwater flow and solute transport model, developed for the northern part of Broward County, Florida, was used to predict the effect of sealevel rise on future coastal groundwater resources. Using average annual conditions from 2005, simulations were performed for 100 years into the future using four different rates...
Langevin, Christian D.; Zygnerski, Michael R.; White, Jeremy T.; Hughes, Joseph D.