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Study of Climate Change Impacts on Temporal and Spatially Varying Groundwater Recharge

Beigi, Ehsan | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40320 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Abrishamchi, Ahmad
  7. Abstract:
  8. Increase of concentration of CO2 and other greenhouse gases will have significant effect on global climate. Climate change affects precipitation and hydrology, which in turn influences recharge to groundwater. Recharge to groundwater is an important source, which has the main role in groundwater resources availability. To trace these changes to recharges and its consequent effect on groundwater state, a combined modeling of climate change and groundwater is necessary. In This study impact of climate change on groundwater recharge in two different climatic plains of Karkheh river basin in Khuzestan, Iran, has been investigated using a physically-based methodology that can be used for predicting both temporal and spatial varying groundwater recharge. Recharge was estimated by using the Hydrological Evaluation of Landfill Performance (HELP3) water budget model. The impact of climate change was modeled using two downscaled scenarios (A2, B2) due to CGCM2 and two large scale scenario (AB1, B1) due to CGCM3 model results. These data were derived for three periods: 2010-2039, 2040-2069, and 2070-2099. The significant differences between these four scenarios indicate that prediction of future recharge is highly dependent on the scenarios selected. While groundwater recharge is predicted to increases under B2 scenario, it will change slightly under A2, B1 and AB1 scenarios. The results also showed how groundwater recharge alters spatially across Kuhdasht plain, due to variations in land use, underlying soil characteristics.
  9. Keywords:
  10. Climate Change ; Karkheh Dam River Basin ; Hydrologic Model ; Groundwater Recharge ; Kuhdasht Plain ; Karkhehnoor Plain

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