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Effect of flood spreading on the quality and quantity of ground water flocculation at Tokahour– Hashtbandi Plain- South of Iran
Ferial Abshiri , Ommolbanin Bazrafshan * , Mehdi Biniaz
University of Hormozgan
Abstract:   (247 Views)
EXTENDED ABSTRACT

Introduction: Due to the increase in population and the lack of rainfall in arid and semi-arid areas and considering the importance of underground water sources, various plans have been made to strengthen these reserves. One of the mentioned plans is the creation and construction of flood spreading projects. It is necessary to check the performance of these projects and it makes the next similar projects to be done more accurately and correctly. The purpose of this research is to investigate the effect of flood spreading on changes in the quantity and quality of underground water in the Toukahour - Hashtbandi plain.
Methodology: For this purpose, first, SPI was calculated in the time scales of 12, 18, 24, 30, 36, 42 and 48 months at Cheraghabad Jaghin station. In the next step, three wells with conventional names A1 to A3 were selected to evaluate quantitative changes and five wells with conventional names B1 to B5 were selected for qualitative evaluation as they had the closest position to the flood spreading area. In the next step, the GRI index was calculated. Then, using Petit's test, the time of flood spreading effect on quantitative and qualitative resources was determined. Then, by dividing the statistical period into two parts, the time before the impact of flood spreading and after the impact of flood spreading, using linear analysis, the slope of changes in GRI, EC and SAR index for both times was done for the selected wells. In the next step, the effect of flood spreading on the sensitivity of underground water resources to drought was evaluated using correlation analysis and linear analysis.
Results and Discussion: The results showed that the time of flood spreading effect on the quantity of three wells A1, A2 and A3 is 2009, 2009 and 2012 respectively. Also, it was not possible to determine the time of flood spreading effect for the EC values of well B4 and for SAR values in wells B2 to B5 due to the non-significance of the Pettit test. For this reason, these wells were excluded from the analysis. The time of flood spreading effect on EC values of B1, B2, B3 and B5 wells was determined in 2007, 2009, 2013 and 2009 respectively and on SAR values of B1 well in 2010. The results of the evaluation of the effect of flood spreading on the quantity of underground water show the improvement of all three selected wells due to the effect of flood spreading. Also, the spread of flood effect on water EC changes indicates a decrease in the slope of EC changes due to flood spread. However, flood spreading has not had much effect on SAR. The results of the evaluation of the effect of flood spreading on the sensitivity of groundwater quantity to drought showed that flood spreading has reduced the sensitivity of GRI and EC index to drought in selected wells, but it has not been able to reduce the sensitivity of SAR to drought.
Conclusion: In general, the results showed that flood spreading has caused a slight improvement in water resources. In other words, the spread of floods, although with a time delay, affects the underground water level in the downstream areas. This effect has different intensities according to the distance of the flood spreading area and environmental characteristics, including soil characteristics, etc. Also, flood spreading has reduced the salinity trend in water sources and reduced the intensity of changes after the start of the flood spreading effect. Another benefit of flood spreading is reducing the sensitivity of water resources to drought. This point is very important in the management of water resources. However, the effect of flooding on each of the quality indicators of water resources is different.
Article number: 3
Keywords: Water spreading, Ground water Drought, Petit test.
     
Type of Study: Research | Subject: General
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مجله علمی سامانه های سطوح آبگیر باران Iranian Journal of Rainwater Catchment Systems
تکمیل و ارسال فرم تعارض منافع
نویسنده گرامی ، پس از ارسال مقاله ، جهت دریافت فرم، لطفا بر روی کلمه فرم تعارض منافع کلیک نمایید و پس از تکمیل، در فایل های پیوست مقاله قرار دهید.
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