scholarly journals A Generalized Semi-Analytical Solution for the Dispersive Henry Problem: Effect of Stratification and Anisotropy on Seawater Intrusion

Water ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 230 ◽  
Author(s):  
Marwan Fahs ◽  
Behshad Koohbor ◽  
Benjamin Belfort ◽  
Behzad Ataie-Ashtiani ◽  
Craig Simmons ◽  
...  
Keyword(s):  
Analytical Solution ◽  
Seawater Intrusion ◽  
Henry Problem

scholarly journals A New Normalized Groundwater Age-Based Index for Quantitative Evaluation of the Vulnerability to Seawater Intrusion in Coastal Aquifers: Implications for Management and Risk Assessments

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2496
Author(s):  
Mohammed Adil Sbai ◽  
Abdelkader Larabi ◽  
Marwan Fahs ◽  
Joanna Doummar
Keyword(s):  
Steady State ◽  
Seawater Intrusion ◽  
Coastal Aquifers ◽  
Groundwater Age ◽  
Groundwater Resources ◽  
Age Distribution ◽  
Flow Simulation ◽  
Risk Assessments ◽  
Henry Problem ◽  
Variable Density Flow

The vulnerability of coastal aquifers to seawater intrusion has been largely relying on data-driven indexing approaches despite their shortcomings to depict the complex processes of groundwater flow and mass transport under variable velocity conditions. This paper introduces a modelling-based alternative technique relying on a normalized saltwater age vulnerability index post-processed from results of a variable density flow simulation. This distributed index is obtained from the steady-state distribution of the salinity and a restriction of the mean groundwater age to a mean saltwater age distribution. This approach provides a novel way to shift from the concentration space into a vulnerability assessment space to evaluate the threats to coastal aquifers. The method requires only a sequential numerical solution of two steady state sets of equations. Several variants of the hypothetical Henry problem and a case study in Lebanon are selected for demonstration. Results highlight this approach ability to rank, compare, and validate different scenarios for coastal water resources management. A novel concept of zero-vulnerability line/surface delineating the coastal area threatened by seawater intrusion has shown to be relevant for optimal management of coastal aquifers and risk assessments. Hence, this work provides a new tool to sustainably manage and protect coastal groundwater resources.

scholarly journals On the use of COMSOL Multiphysics for seawater intrusion in fractured coastal aquifers

2018 ◽  
Vol 54 ◽  
pp. 00020 ◽  
Author(s):  
B. Mozafari ◽  
M. Fahs ◽  
B. Ataie-Ashtiani ◽  
C. T. Simmons ◽  
Rafic Younes
Keyword(s):  
Seawater Intrusion ◽  
Coastal Aquifers ◽  
Element Model ◽  
Simulation Software ◽  
Comsol Multiphysics ◽  
Software Environment ◽  
Discrete Fracture Model ◽  
Henry Problem ◽  
Wide Range ◽  
Set Up

COMSOL Multiphysics is a comprehensive simulation software environment for a wide range of applications. COMSOL has an interactive interface that facilitates the modeling procedure and allows an easy coupling of different physical processes. The Subsurface Flow module extends the COMSOL modeling environment to applications related to fluid flow in saturated and variably saturated porous media. COMSOL is increasingly used in the investigation of geophysical, hydrogeological and environmental phenomena. The main goal of this work is to explore the ability of COMSOL for simulating seawater intrusion (SWI) in fractured coastal aquifers. Numerical modeling of such a problem is of high interest as fractured/karstic coastal aquifers are widespread and processes of SWI in the presence of fractures remains poorly understood. We set up a COSMOL model for the popular Henry problem. The accuracy of COMSOL is highlighted by comparison against the semianalytical solutions for simple homogeneous aquifers. For fractured aquifers, the performance of COSMOL is evaluated by comparison against an in-house finite element model based on the discrete fracture model and against the results of existing works. Given its versatility and flexibility, COMSOL shows promise as a tool for SWI in coastal aquifers.

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