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Numerical Models with Discrete Approach for Simulating Seawater Intrusion in Fractured and Karst Coastal Aquifers

Mozafari, Behzad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51591 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ataie Ashtiani, Behzad
  7. Abstract:
  8. In many countries of the world, especially dry and semi-arid areas, coastal aquifers are used to provide fresh water. Many of these areas have also become urbanaized, which has made the need for freshwater more important. Seawater Intrusion (SWI) is the greatest limitation that influences the exploitation of groundwater in coastal aquifers, where with SWI, the amount of freshwater supply and other existing pumping wells are not used. The present study attempts to model SWI in karst and fractured coastal aquifers. For this purpose, two models with Discrete Fracture/Conduit Network approach in Fortran and also in COMSOL Multiphysics software have been developed to study the density-variable flow and solute transport. The karst aquifer consists of a conduit network and a fractured aquifer including a network of fractures, both of which are enclosed in a porous medium. In the Darcy-Brinkman model, the Brinkman equation is used for a saturated conduit network and laminar flow in a saturated porous medium is governed by the Darcy equation. Unlike existing models that assume either equivalent properties for the whole of an aquifer or exchange functions to correlate the equations, in this model by removing these two limitations, a new method for simulating SWI in karst aquifers is presented. An equation for a density-dependent flow is formulated that can couple the flow and transfer equations. Then these equations are solved numerically by finite element method. For verifying the results of these models, semi-analytic solutions as benchmarks are used. The results are well matched to other models, which indicates the high accuracy of the models in simulating flow and transport of solute in karst and fractured aquifers
  9. Keywords:
  10. Fractured Coastal Aquifers ; Karst Coastal Aquifers ; Sea Water Intrusion ; Numerical Modeling ; Discrete Approach ; Darcy-Brinkman Model

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