Results 191 to 200 of about 2,287 (214)
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Implementing Spatially Variable Anisotropy in MODFLOW
Groundwater, 1997Abstract The U.S. Geological Survey modular ground‐water flow model (MODFLOW) allows column to row anisotropy to vary only in different layers. Modifications to the code were made to allow each grid block in the model to have its own anisotropy, and still retain backward compatibility with the original formulation.
Michael P. Kladias, Gregory J. Ruskauff
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Selecting MODFLOW Cell Sizes for Accurate Flow Fields
Groundwater, 2001Abstract Contaminant transport models often use a velocity field derived from a MODFLOW flow field. Consequently, the accuracy of MODFLOW in representing a ground water flow field determines in part the accuracy of the transport predictions, particularly when advective transport is dominant. We compared MODFLOW ground water flow rates
H, Haitjema, V, Kelson, W, de Lange
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Permeameter Data Verify New Turbulence Process for MODFLOW
Groundwater, 2008Abstract A sample of Key Largo Limestone from southern Florida exhibited turbulent flow behavior along three orthogonal axes as reported in recently published permeameter experiments. The limestone sample was a cube measuring 0.2 m on edge.
Eve L, Kuniansky +2 more
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Comparison of Local Grid Refinement Methods for MODFLOW
Groundwater, 2006Abstract Many ground water modeling efforts use a finite‐difference method to solve the ground water flow equation, and many of these models require a relatively fine‐grid discretization to accurately represent the selected process in limited areas of interest.
Steffen, Mehl +2 more
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SHYDG.FOR—Hydrograph Package for MODFLOW
Groundwater, 1993Abstract SHYDG.FOR—Hydrograph Package for MODFLOW, was written for use with the USGS finite‐difference ground‐water flow model (MODFLOW). This program allows the user to specify a list of nodes where model generated heads are saved separately.
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A Python Script to Compute Isochrones for MODFLOW
Groundwater, 2017Abstract MODFLOW constitutes today the most popular modeling tool in the study of water flow in aquifers and in modeling aquifers. To simplify the interface to MODFLOW various GUI have been developed for the creation of model definition files and for the visualization and interpretation of results. Recently Bakker et al.
FEO, Alessandra +3 more
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Generating MODFLOW Grids from Boundary Representation Solid Models
Groundwater, 2002Abstract Complex stratigraphy can be difficult to simulate in MODFLOW models. MODFLOW uses a structured grid that requires that each grid layer be continuous throughout the model domain. This makes it difficult to explicitly represent common features such as pinchouts and embedded seams in a MODFLOW model. In this paper, we describe a
Norman L, Jones +3 more
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Evaluation of the MODFLOW‐2005 Conduit Flow Process
Groundwater, 2010The recent development of the Conduit Flow Process (CFP) by the U.S. Geological Survey (USGS) provides hydrogeologic modelers with a new tool that incorporates the non‐Darcian, multiporosity components of flow characteristic of karst aquifers. CFP introduces new parameters extending beyond those of traditional Darcian groundwater flow codes.
Hill, Melissa E. +2 more
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Improved Calculations for Dewatered Cells in MODFLOW
Groundwater, 2001Abstract Use of the United States Geological Survey ground water flow model MODFLOW is often hampered by the occurrence of “dry cells.” While MODFLOW allows such cells to “rewet” in the course of a simulation, stability of the heads solution process is often problematical with rewetting functionality operative.
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Optimization techniques using MODFLOW-GWM
2015An important application of optimization codes such as MODFLOW-GWM is to maximize water supply from unconfined aquifers subject to constraints involving surface-water depletion and drawdown. In optimizing pumping for a fish hatchery in a glacial deposits over bedrock aquifer system in eastern Wisconsin, various features of the GWM-2000 code were used ...
Grava, A +6 more
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