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Investigation of Drought Effects on the Groundwater Level in the Lake Urmia Basin

Hayatbini, Negin | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46744 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Abrishamchi, Ahmad
  7. Abstract:
  8. The phenomenon of drought causes many damages which is not limited to arid and semi-arid areas and may have destroying effects on groundwater resources of any region. To investigate the drought effects on one of the Lake Urmia’s sub-basin, the precipitation data in 25 rain stations in period of 45 years (2011-1976) was used. After completing and restoring data, and checking the randomness and homogeneity of them, standardized precipitation index (SPI) with different time scales has been calculated. According to that, the monitoring maps of drought using ArcGIS tool with regard to best interpolation method was created in order to identify the sensitive areas in dry years.
    Moreover, assessment of hydrogeological droughts and monitoring the groundwater level decrease in order to provide appropriate protection and management strategies of water resources is essential. For this purpose, after completing the groundwater level data of region using probabilistic methods, the groundwater resource indicator GRI (Groundwater Resource Index) was calculated. The decreasing trend of this indicator in recent years shows the groundwater resources drought with high levels of severity.
    In order to assess the dependency of groundwater level decline in association with the phenomenon of meteorological drought, the correlation coefficient has been calculated between the average water level of the groundwater (GRI index) with SPI index in different time scales, with and without delay. According to the achievements and depending on the study regions there is a significant correlation of 99% between GRI index and the SPI index in24 and 48 month time scales with a short delay. This indicates the direct impact of meteorological drought on the local groundwater resource. On the one hand, this short time delay reveals the significant role of human intervention in increasing the sensitivity of the region’s aquifer and also reduction of the duration of precipitation changes effect on the groundwater level
  9. Keywords:
  10. Drought ; Lake Urmia Watershed ; Groundwater Resource Index (GRI) ; Standardized Precipitation Index (SPI) ; Urmia Lake Subbasin

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