Ground water in karst terrains is highly vulnerable to contamination due to the rapid transport of contaminants through the highly conductive conduit system. For contamination risk assessment purposes, information about hydraulic and geometric characteristics of the conduits and their hydraulic interaction with the fissured porous rock is an important prerequisite. The relationship between aqui...

A model coupling fluid hydraulics in a borehole with fluid flow in an aquifer is developed in this paper. Conservation of momentum is used to create a one-dimensional steady-state model of vertical flow in an open borehole combined with radially symmetric flow in an aquifer and with inflow to the well through the wellbore screen. Both laminar and turbulent wellbore conditions are treated. The i...

APEX ( A gricultural P olicy/ E nvironmental e X tender) is an oft-used agroecosystem model but has limited use in groundwater-driven watersheds due to a simplistic representation of groundwater processes. This paper presents the linkage and flow MODFLOW into single modeling code. The mapping recharge, head, groundwater-surface water interactions are handled internally via subroutines. APEX-MOD...

Introduction MT3DMS is a three-dimensional (3D) multispecies contaminant transport model with a modular structure to permit simulation of solute transport processes independently or jointly (Zheng and Wang 1999; Zheng 2009). MT3DMS interfaces directly with the U.S. Geological Survey’s finite-difference ground water flow model, MODFLOW, for the flow solution, and supports all the hydrologic and ...

Cleanup of contaminated aquifers by pumping and injection is one of the commonly used approaches for the remediation of groundwater contamination. Contaminant transport travel time in groundwater can be calculated using a method called ‘particle-tracking’ based on advection. The travel time of the contaminants is a highly non-linear and nonconvex function of pumping/injection rates and well loc...

This paper presents some simulation–optimization models for groundwater resources management. These models couple two of the most successful global optimization techniques inspired by swarm intelligence, namely particle swarm optimization (PSO) and ant colony optimization (ACO), with one of the most commonly used groundwater flow simulation code, MODFLOW. The coupled simulation–optimization mod...

Accurate hydrological simulations are crucial for managing water resources and promoting sustainable agriculture in submerged paddy agricultural watersheds. The SWAT-MODFLOW, which couples the Soil Water Assessment Tool (SWAT) Modular Groundwater Flow (MODFLOW) model, is a widely used tool hydrologic that consider surface groundwater (SW-GW) interactions. However, it falls short of effectively ...

This study presents an integrated modeling system for the evaluation of quantity and quality water resources coastal agricultural watersheds. The consists coupled interrelated models, including (i) a surface hydrology model (UTHBAL), (ii) groundwater (MODFLOW), (iii) crop growth/nitrate leaching (REPIC, R-ArcGIS-based EPIC model), (iv) contaminant transport (MT3DMS), (v) seawater intrusion (SEA...