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Saltwater Up-coning into Pumping Wells in Coastal Aquifers in Fractured
Soil

Ebrahimi, Nazanin | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53271 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ataie Ashtiani, Behzad
  7. Abstract:
  8. The goal of this research is to investigate the phenomenon of saltwater up-coning into pumping wells in fractured porous media. For this aim, two series of regular orthogonal fracture networks and different vertical and horizontal fracture apertures are simulated using an axisymmetric (2D vertical cross-section) model with a sharp interface approach. The effect of changing the pumping rate and the hydraulic conductivity has been examined to recognize other effective characteristics of the aquifer and pumping well on the saltwater up-coning. These simulations have been performed in COMSOL Multiphysics. The results indicate that the saltwater extent under the pumping well can be affected significantly by the fracture aperture and the fracture spacing. By increasing the aperture of the vertical and the horizontal fractures and reducing the space between the fractures, the extent of the saltwater has been reduced. Moreover, increasing the pumping rate causes expanding the extent of saltwater through the pumping well. Furthermore, increasing hydraulic conductivity results in the reduction of saltwater concentration in the domain owing to the fact that increasing the hydraulic conductivity facilitates freshwater flow pathway through the domain, and the saltwater would not able to expand. Also, the results show that the critical pumping rate of the wells, in case of the existence of fractures in the domain, increases up to three times bigger than the normal pumping rate
  9. Keywords:
  10. Groundwater ; Fractured Coastal Aquifers ; Crack ; Salt Water ; Up-Coning ; Saltwater Intrusion

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