This study aimed at optimizing horizontal subsurface flow constructed wetlands (CWs) to improve hydraulic performance and pollutant removal efficiency. A groundwater modeling package (MODFLOW) was used to optimize three design parameters (length-to-width ratio, inlet/outlet-to-length ratio, and substrate size configuration). Using the optimized parameters, three pilot-scale CWs were built to tr...

A ground-water flow and transport model simulating contaminant movement to public supply wells in the High Plains aquifer near York, Nebraska was developed as part of the U.S. Geological Survey National Water-Quality Assessment Program. Water-quality samples were collected from wells screened in unconfined and confined units. Samples collected from a public supply well and selected monitoring w...

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...

A coupled regional and local model is required when groundwater flow solute transport are to be simulated in areas of interest with a finer grid while aquifer boundary major stresses should retained coarser grid. The also maintain interactions between the systems. In Beijing Plain (China), assessment managed recharge (MAR), pollution caused by rivers, capture zone well fields, land subsidence a...

In systems and control theory dynamical systems described by partial differential equations are known as distributed parameter systems. For modelling and dynamical analysis of distributed parameter systems wide possibilities are offered by virtual software environments as ANSYS, COMSOL Multiphysics, ProCAST, MODFLOW, based on numerical solution of sets of partial differential equations by finit...

Freshwater resources on small coral islands mainly exist in the form of freshwater lenses. The lens is highly vulnerable to salinization due natural recharge variations and urbanization construction. However, it unclear how a evolves under influence construction which factors control its evolution. Based hydrogeological data island China, corresponding 3D numerical model was established by Visu...

Soil and water conservation measures can impact hydrological cycle, but quantitative analysis of this impact is still difficult in a watershed scale. To assess the effect quantitatively, a three-dimensional finite-difference groundwater flow model (MODFLOW) with a surface runoff model-the Soil Conservation Service (SCS) were calibrated and applied based on the artificial rainfall experiments. T...