This paper presents an approach for coupling MODFLOW and MT3DMS for the simulation of variable-density ground water flow. MODFLOW routines were modified to solve a variable-density form of the ground water flow equation in which the density terms are calculated using an equation of state and the simulated MT3DMS solute concentrations. Changes to the MODFLOW and MT3DMS input files were kept to a...

In order to simulate large-scale ground water flow problems more efficiently with MODFLOW, the OpenMP programming paradigm was used to parallelize the preconditioned conjugate-gradient (PCG) solver with in this study. Incremental parallelization, the significant advantage supported by OpenMP on a shared-memory computer, made the solver transit to a parallel program smoothly one block of code at...

s of Papers & Presentations of MODFLOW-SURFACTTM and MODHMS® HGL Software Systems HydroGeoLogic, Inc. 1107 Sunset Hills Road Ste. 400 Reston VA 20190

FRACK is a fractured media freeware flow and solute transport suite currently under development that is intended to serve as both a preand post-processor to MODFLOW. As a pre-processor, FRACK generates and maps networks of deterministic and/or stochastic fractures onto a regularly-spaced finitedifference grid, according to a fracture continuum method that closely approximates flow solutions to ...

Investigation of the interaction of surface water (SW) and groundwater (GW) is critical in order to determine the effects of best management practices (BMPs) on the entire system of water resources. The objective of this research was to develop a modeling system for considering SW–GW interactions and to demonstrate the applicability of the developed system. A linked modeling approach was select...

In the Peruvian Andes, water infiltration from tropical wetlands, called páramo, generates headwaters for downstream rivers. The hydrological processes of these wetlands are not well understood within the larger hydrological system, impeding efforts to mitigate the rapid environmental changes anticipated due to regional population growth and climate change. This study constructed and calibrated...