Investigation of sea level rise effect on saltwater intrusion in an unconfined coastal aquifer using sharp-interface approach

Vafaie, Freydoon; Mehdizadeh, S. Sadjad

doi:10.1504/ijgw.2015.073052

Cited by 2 publications

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“…From the electrical resistivity measurements, the true resistivity of the subsurface can be estimated. The ground resistivity is related to various geological parameters such as the minerals, fluid content, porosity and degree of water saturation in the rock [9].…”

Section: Introductionmentioning

confidence: 99%

DELINEATION OF AQUIFEROUS ZONES USING GEOPHYSICAL METHODS AND CONTAMINANT FLOW DIRECTION -A case study of dumpsite at Cassidy, Okokomaiko, LASU-Badagry Expressway, Lagos State, Nigeria

Adegbola

Abidoye

Adaranijo

2020

JRRS

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Introduction: Cassidy area, of Okokomaiko, Ojo, Lagos State, is a rapidly developing area with attendant growing population arising from the presence of University, financial institutions and popularly known Alaba market. Unfortunately, water supply by the water corporation is not readily available. The inhabitants only rely on the surface water and groundwater extracted from hand dug wells and boreholes. Aims: The study is to map the aquiferous zone and establish the groundwater flow direction, with a view to averting subsurface contamination emanated from dumpsite within the area. Materials and Methods: Twenty five (25) Vertical Electrical Sounding (VES) using Schlumberger electrode array, four (4) Electrical Resistivity imaging using Wenner Electrode Array were acquired at four different traverses. Manual groundwater flow direction was also conducted. Results: The identified unconfined aquifer was sand/sandy clay which is overlain by peat/clay soil that is loose and may allow downward migration of the contaminant plumes to deep groundwater. However, the confined aquifer observed to occur approximately at depth 18 m. The electrical resistivity distribution observed decreases upward, south and north. This implies increase in conductivity in such directions and as such indicating the contaminant could be more concentrated near-surface, north and south. Conclusion: The implication of the results obtained with respect to vulnerability to groundwater pollution is that the southern section of the aquifer is more susceptible to receive transported contaminants from the northern part of the study area. The study suggests the potential borehole should be sited in the north-eastern direction with the aid of geophysical survey.

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Section: Introductionmentioning

confidence: 99%

DELINEATION OF AQUIFEROUS ZONES USING GEOPHYSICAL METHODS AND CONTAMINANT FLOW DIRECTION -A case study of dumpsite at Cassidy, Okokomaiko, LASU-Badagry Expressway, Lagos State, Nigeria

Adegbola

Abidoye

Adaranijo

2020

JRRS

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A Fully Implicit Finite Volume Scheme for a Seawater Intrusion Problem in Coastal Aquifers

Aharmouch

Amaziane

Ossmani

et al. 2020

Water

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We present a numerical framework for efficiently simulating seawater flow in coastal aquifers using a finite volume method. The mathematical model consists of coupled and nonlinear partial differential equations. Difficulties arise from the nonlinear structure of the system and the complexity of natural fields, which results in complex aquifer geometries and heterogeneity in the hydraulic parameters. When numerically solving such a model, due to the mentioned feature, attempts to explicitly perform the time integration result in an excessively restricted stability condition on time step. An implicit method, which calculates the flow dynamics at each time step, is needed to overcome the stability problem of the time integration and mass conservation. A fully implicit finite volume scheme is developed to discretize the coupled system that allows the use of much longer time steps than explicit schemes. We have developed and implemented this scheme in a new module in the context of the open source platform DuMu X . The accuracy and effectiveness of this new module are demonstrated through numerical investigation for simulating the displacement of the sharp interface between saltwater and freshwater in groundwater flow. Lastly, numerical results of a realistic test case are presented to prove the efficiency and the performance of the method.

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Investigation of sea level rise effect on saltwater intrusion in an unconfined coastal aquifer using sharp-interface approach

Cited by 2 publications

References 0 publications

DELINEATION OF AQUIFEROUS ZONES USING GEOPHYSICAL METHODS AND CONTAMINANT FLOW DIRECTION -A case study of dumpsite at Cassidy, Okokomaiko, LASU-Badagry Expressway, Lagos State, Nigeria

DELINEATION OF AQUIFEROUS ZONES USING GEOPHYSICAL METHODS AND CONTAMINANT FLOW DIRECTION -A case study of dumpsite at Cassidy, Okokomaiko, LASU-Badagry Expressway, Lagos State, Nigeria

A Fully Implicit Finite Volume Scheme for a Seawater Intrusion Problem in Coastal Aquifers

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