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Determination of the Suitable Site to Build Underground Dams for the Recharge and Discharge Control of Qanats by Using Analytical Hierarchy Process (AHP)
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Masoud Eshghizadeh *   , Nader Noura |
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Abstract: (12244 Views) |
| One of the main disadvantages of qanat is a constant output. Underground dams are a simple and applied method to collect and supply water in arid and semi-arid regions. In this research, suitable sites for underground dam to control recharge and discharge of qanats, has been presented with a case of study on one small sub-catchment of Kalat watershed of Gonabad (Iran). In the present method, first, layers of the fault area and lithology, alluvial bed, slope, residential areas and qanats areas in GIS has been analyzed. Results show that 37 percent of length of qanats in 12 reaches has been determined to have potential for underground dam construction. Then the variation of the bed altitude, floor altitude of qanat gallery, bedrock altitude, width and depth of the alluvium bed for 12 reaches were determined and only 8 sites proposed for underground dam construction on the qanats. In the next stage, a new index called alluvial capacity index was introduced. With this index appropriate sites among proposed sites were determined. Finally, analytical hierarchy process (AHP) and Expert Judgment were used to determine and prioritize the most appropriate site. The results of this study showed that the AHP is capable to determine suitable sites with the use of quantitative and qualitative criteria for construction of underground dams on the qanats. |
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| Keywords: Qanat, Underground dam, AHP, Kalat watershed of Gonabad |
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Full-Text [PDF 347 kb]
(1958 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2014/02/16 | Accepted: 2014/02/16 | Published: 2014/02/16
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