a new mathematical model for identifying pollution sources in aquifers is presented. the model utilizes lagrange constrained optimization method (lcom) and is capable to inversely solve unsteady fluid flow in saturated, heterogeneous, anisotropic confined and/or unconfined aquifers. throughout the presented model, complete advection-dispersion equation, including the adsorption as well as retar...

Abstract The distribution of groundwater age is useful for evaluating the susceptibility and sustainability resources. Here, we compute aquifer-scale cumulative function to characterize 21 Principal Aquifers that account ~80% public-supply pumping in United States. each Aquifer was derived from an ensemble modeled distributions (~60 samples per aquifer) based on multiple tracers: tritium, triti...

The increasing trend in borehole failures and the general decline groundwater levels yields due to climate change mostly semi-arid regions such as Damaturu Yobe State, needs an urgent intervention order sustain provision of quality drinking water populace. In this study, we investigated potential New Jerusalem Damaturu, using electrical resistivity method. results obtained showed that study are...

A physically based inverse method is developed using hybrid formulation and coordinate transform to simultaneously estimate hydraulic conductivity tensors, steady-state flow field, and boundary conditions for a confined aquifer under ambient flow or pumping condition. Unlike existing indirect inversion techniques, the physically based method does not require forward simulations to assess model-...

A sharp interface numerical model is developed to simulate saltwater intrusion in multilayered coastal aquifer systems. The model takes into account the flow dynamics of salt water and fresh water assuming a sharp interface between the two liquids. In contrast to previous two-fluid flow models which were formulated using the hydraulic heads of fresh water and salt water as the dependent variabl...

Groundwater pollution has become a worrisome phenomenon, mainly for aquifers underlying industrialized areas. In order to evaluate the risk of pollution, a model of the aquifer is needed. Herewith, we describe a quasi-tridimensional model, which we applied to a multilayered aquifer where a phreatic aquifer was coupled to a confined one by means of an aquitard. This hydrogeological scheme is oft...

[1] Because of transverse pore-scale dispersion, a mixing layer develops along the interface between a lighter fluid (fresh water) that flows toward a well or sink above a heavier fluid (seawater) in a steady axisymmetric configuration. The Peclet number characterizing mixing, Pe = L/aT, where L is the aquifer thickness and aT is transverse dispersivity, is generally much larger than unity. The...