Christian Langevin
Dr. Christian Langevin is a research hydrologist with the USGS Water Resources Mission Area.
Dr. Christian Langevin is a research hydrologist with the U.S. Geological Survey Earth Systems Modeling Branch. He presently sits in the Mounds View Office in Minnesota, which is part of the Upper Midwest Water Science Center. Dr. Langevin is the primary USGS contact for the MODFLOW program, which is used worldwide to simulate groundwater flow. His present research focuses on development and support of the MODFLOW 6 program and other related programs, such as FloPy, SEAWAT, MT3D-USGS, MODFLOW-USG, and MODFLOW-2005. Dr. Langevin 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.
Science and Products
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)
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
Future of groundwater modeling
Improving sub-grid scale accuracy of boundary features in regional finite-difference models
Effect of the difference between water-table elevation and hydraulic head on simulation of unconfined aquifers using MODFLOW
Predictive uncertainty analysis of a saltwater intrusion model using null-space Monte Carlo
Use of hydrologic and hydrodynamic modeling for ecosystem restoration
Use of upscaled elevation and surface roughness data in two-dimensional surface water models
Effect of tidal fluctuations on transient dispersion of simulated contaminant concentrations in coastal aquifers
Creative use of pilot points to address site and regional scale heterogeneity in a variable-density model
Application of SEAWAT to select variable-density and viscosity problems
Use of time series and harmonic constituents of tidal propagation to enhance estimation of coastal aquifer heterogeneity
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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-Venant equations have been implemented. Both methodsAuthorsJoseph D. Hughes, Christian D. Langevin, Kevin L. Chartier, Jeremy T. WhiteSimulated 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 aquifer and bedrock fracture zones that intersectedAuthorsRichard M. Yager, Todd S. Miller, William M. Kappel, Paul E. Misut, Christian D. Langevin, David L. Parkhurst, M. Peter deVriesFuture 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. Thus we acknowledge this as we present our visionAuthorsChristian D. Langevin, Sorab PandayImproving 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 regular finite-difference groundwater flow equatioAuthorsSorab Panday, Christian D. LangevinEffect of the difference between water-table elevation and hydraulic head on simulation of unconfined aquifers using MODFLOW
No abstract available.AuthorsAlden M. Provost, Christian D. LangevinPredictive 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 intrusion model patterned after the Henry problem.AuthorsDaan Herckenrath, Christian D. Langevin, John DohertyUse of hydrologic and hydrodynamic modeling for ecosystem restoration
Planning and implementation of unprecedented projects for restoring the greater Everglades ecosystem are underway and the hydrologic and hydrodynamic modeling of restoration alternatives has become essential for success of restoration efforts. In view of the complex nature of the South Florida water resources system, regional-scale (system-wide) hydrologic models have been developed and used extenAuthorsJ. Obeysekera, L. Kuebler, S. Ahmed, M.-L. Chang, V. Engel, Christian D. Langevin, Eric D. Swain, Y. WanUse of upscaled elevation and surface roughness data in two-dimensional surface water models
In this paper, we present an approach that uses a combination of cell-block- and cell-face-averaging of high-resolution cell elevation and roughness data to upscale hydraulic parameters and accurately simulate surface water flow in relatively low-resolution numerical models. The method developed allows channelized features that preferentially connect large-scale grid cells at cell interfaces to beAuthorsJ.D. Hughes, J.D. Decker, C.D. LangevinEffect 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 concentrations in a coastal aquifer were assessed. Three analyAuthorsIvana La Licata, Christian D. Langevin, Alyssa M. Dausman, Luca AlbertiCreative 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 points were used within in multiple model layers, wAuthorsAlyssa M. Dausman, John Doherty, Christian D. LangevinApplication 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 more MT3DMS species, and optionally, fluid pressureAuthorsAlyssa M. Dausman, Christian D. Langevin, Danny T. Thorne, Michael C. SukopUse 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. “Observed” water‐level data were generated by adding noise, represeAuthorsJoseph D. Hughes, Jeremy T. White, Christian D. Langevin - Software
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