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
MT3D-USGS version 1: A U.S. Geological Survey release of MT3DMS updated with new and expanded transport capabilities for use with MODFLOW
Scripting MODFLOW model development using Python and FloPy
A semi-structured MODFLOW-USG model to evaluate local water sources to wells for decision support
GRIDGEN Version 1.0: a computer program for generating unstructured finite-volume grids
MODFLOW-based coupled surface water routing and groundwater-flow simulation
Effect of tidal fluctuations on transient dispersion of simulated contaminant concentrations in coastal aquifers
Effects of sea-level rise on salt water intrusion near a coastal well field in southeastern Florida
Documentation of the seawater intrusion (SWI2) package for MODFLOW
Seawater circulation in sediments driven by interactions between seabed topography and fluid density
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
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
Modeling variably saturated subsurface solute transport with MODFLOW-UZF and MT3DMS
Science and Products
- Science
- Data
- Publications
Filter Total Items: 68
MT3D-USGS version 1: A U.S. Geological Survey release of MT3DMS updated with new and expanded transport capabilities for use with MODFLOW
MT3D-USGS, a U.S. Geological Survey updated release of the groundwater solute transport code MT3DMS, includes new transport modeling capabilities to accommodate flow terms calculated by MODFLOW packages that were previously unsupported by MT3DMS and to provide greater flexibility in the simulation of solute transport and reactive solute transport. Unsaturated-zone transport and transport within stAuthorsVivek Bedekar, Eric D. Morway, Christian D. Langevin, Matthew J. TonkinScripting MODFLOW model development using Python and FloPy
Graphical user interfaces (GUIs) are commonly used to construct and postprocess numerical groundwater flow and transport models. Scripting model development with the programming language Python is presented here as an alternative approach. One advantage of Python is that there are many packages available to facilitate the model development process, including packages for plotting, array manipulatiAuthorsMark Bakker, Vincent E. A. Post, Christian D. Langevin, Joseph D. Hughes, Jeremy T. White, Jeffrey Starn, Michael N. FienenA semi-structured MODFLOW-USG model to evaluate local water sources to wells for decision support
In order to better represent the configuration of the stream network and simulate local groundwater-surface water interactions, a version of MODFLOW with refined spacing in the topmost layer was applied to a Lake Michigan Basin (LMB) regional groundwater-flow model developed by the U.S. Geological. Regional MODFLOW models commonly use coarse grids over large areas; this coarse spacing precludes moAuthorsDaniel T. Feinstein, Michael N. Fienen, Howard W. Reeves, Christian D. LangevinGRIDGEN Version 1.0: a computer program for generating unstructured finite-volume grids
GRIDGEN is a computer program for creating layered quadtree grids for use with numerical models, such as the MODFLOW–USG program for simulation of groundwater flow. The program begins by reading a three-dimensional base grid, which can have variable row and column widths and spatially variable cell top and bottom elevations. From this base grid, GRIDGEN will continuously divide into four any cellAuthorsJyh-Ming Lien, Gaisheng Liu, Christian D. LangevinMODFLOW-based coupled surface water routing and groundwater-flow simulation
In this paper, we present a flexible approach for simulating one- and two-dimensional routing of surface water using a numerical surface water routing (SWR) code implicitly coupled to the groundwater-flow process in MODFLOW. Surface water routing in SWR can be simulated using a diffusive-wave approximation of the Saint-Venant equations and/or a simplified level-pool approach. SWR can account for sAuthorsJoseph D. Hughes, Christian D. Langevin, Jeremy T. WhiteEffect 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 AlbertiEffects of sea-level rise on salt water intrusion near a coastal well field in southeastern Florida
A variable-density groundwater flow and dispersive solute transport model was developed for the shallow coastal aquifer system near a municipal supply well field in southeastern Florida. The model was calibrated for a 105-year period (1900 to 2005). An analysis with the model suggests that well-field withdrawals were the dominant cause of salt water intrusion near the well field, and that historicAuthorsChristian D. Langevin, Michael ZygnerskiDocumentation of the seawater intrusion (SWI2) package for MODFLOW
The SWI2 Package is the latest release of the Seawater Intrusion (SWI) Package for MODFLOW. The SWI2 Package allows three-dimensional vertically integrated variable-density groundwater flow and seawater intrusion in coastal multiaquifer systems to be simulated using MODFLOW-2005. Vertically integrated variable-density groundwater flow is based on the Dupuit approximation in which an aquifer is verAuthorsMark Bakker, Frans Schaars, Joseph D. Hughes, Christian D. Langevin, Alyssa M. DausmanSeawater circulation in sediments driven by interactions between seabed topography and fluid density
Measurements of submarine groundwater discharge (SGD) in coastal areas often show that the saltwater discharge component is substantially greater than the freshwater discharge. Several mechanisms have been proposed to explain these high saltwater discharge values, including saltwater circulation driven by wave and tidal pumping, wave and tidal setup in intertidal areas, currents over bedforms, andAuthorsLeonard F. Konikow, M. Akhavan, C.D. Langevin, H.A. Michael, A.H. SawyerMODFLOW–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, for example, or to subdiscretize individual layerAuthorsSorab Panday, Christian D. Langevin, Richard G. Niswonger, Motomu Ibaraki, Joseph D. HughesEstimation 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 from the highly transmissive Biscayne aquifer in thAuthorsLinzy K. Brakefield, Joseph D. Hughes, Christian D. Langevin, Kevin ChartierModeling 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. Referred to as UZF-MT3DMS, the linked model was tested aAuthorsEric D. Morway, Richard G. Niswonger, Christian D. Langevin, Ryan T. Bailey, Richard W. Healy - Software
- News