Assessment the effects of drought on groundwater quantity and quality of Sistan and Baluchistan Province

Document Type : Research Paper

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Abstract

Sistan and Baluchistan plain has been faced with significant reduction of groundwater level in recent years. One of the long-term drought conditions affected groundwater resources. One of the best measures for assessing drought and its effects is the use of the Standardized Precipitation Index (SPI). In this research, using this index, firstly, the long-term drought conditions in the eastern province of Sistan and Balouchestan were investigated and then the effects of drought on groundwater resources were investigated. In order to determine the drought periods, the data from 5 station stations from 1363 to 1393 and the qualitative data of 27 observation wells were used in two periods of 1389 and 1392, which have a good dispersion in the province. Tables of Cl, TDS, EC and Na values were prepared using statistical method to express qualitative changes. The results showed that, due to the decrease in rainfall, the average total of elements and materials in groundwater during the given period increased by 20 to 25 percent in water. Obviously, in addition to the natural factor that is drought, human factors such as population growth, land use change, plant growth, increased use of chemical fertilizers and pesticides have contributed greatly to this change in water quality. The continuation of this process of overburdening of rainfall and overtaking can bring the state of the plain closer to a critical state. Also, the central, western and northern regions will face more drought compared to the western and southern provinces of Sistan and Baluchestan.

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References

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  • Receive Date: 01 March 2017
  • Revise Date: 10 February 2018
  • Accept Date: 14 February 2018

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