Study of the Efficiency of Groundwater Quality Index to Evaluate the Long-term Effects of Inter-Basin Water Transfer Using Non-Parametric Methods and GIS (Case Study Yazd-Ardakan Aquifer)

آب و خاک

Article 3, Volume 35, Issue 6 - Serial Number 80, January and February 2022, Pages 804-791   

Document Type: Research Article

DOI: 10.22067/jsw.2021.71571.1073

Authors

H. Sarvi Sadrabad¹; A. Zare Chahouki^{* 2}

¹Ph.D. Student, Department of Watershed, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University

²Assistant Professor, Department of Watershed , Faculty of Natural Resources, Yazd University

Abstract

Introduction: Inter-basin water transfer affects the environment, culture and economy of donor and recipient basin. In this regard, one of the most important aspects are the positive and negative effects on the quality of groundwater in the recipient basin.  Spatio-temporal changes of groundwater quality as the results of inter-basin water transfer, plays an important role in water resources management. Thus, this study attempts to investigate the temporal trends of groundwater quality parameters using Mann-Kendall test and Sen's slope estimator. In addition, spatial changes of groundwater quality and the effects of inter-basin water transfer were studied.
Materials and Methods: In this study, non-parametric methods and interpolation models were used to evaluate the  spatio-temporal patterns of groundwater quality parameters in the Yazd-Ardakan plain. Mann-Kendall nonparametric test and Sen's slope were used to examine the temporal trends in the span of 2000 to 2020. The interpolation models and groundwater quality index (GQI) were used to study the spatial patterns and classify the quality of groundwater. The assessment of quality parameters of all studied wells including Ca²⁺, Mg²⁺, Cl^-, Na⁺, SO₄^2- and TDS were studied in equal time periods. Groundwater quality measurements were performed twice a year using a volumetric method, one in spring and the other one in autumn. The World Health Organization (WHO) standard was considered to compare values of different parameters in the plain.
Results and Discussion: A decreasing trend was observed in SO₄^2-, Na⁺ and TDS parameters in most wells and there was an increasing trend for Ca²⁺, Mg²⁺ and Cl^- parameters. Considering WHO classification standard, all the studied parameters were in the allowable ranges except TDS. The parameter ranking showed that TDS, Cl^- and Mg²⁺ had the greatest impact on the quality of aquifer groundwater. The Mg and TDS parameters had the highest and the lowest changes, respectively during 2000 to 2020. Results of the GQI showed that the total quality of the Yazd-Ardakan aquifer was in the moderate class and acceptable because of relatively large decrease in the groundwater in the span of the studied period. However, the decrease in groundwater quality was negligible. Changes of the quality map showed that the most negative quality changes were related to the Yazd, Taft, Meybod, Ardakan and northern regions (Chah-Afzal desert). This indicates high groundwater pumping in these areas and being located near the desert area. The most positive quality changes belonged to the central and southern part of the aquifer.
Conclusion: Comparison of the interpolation models showed that the geostatistical methods can show better results than the definitive methods in zoning groundwater quality parameters. The Kriging and IDW models were the best models and consistent with the results of the research. The quality of groundwater was acceptable, while the reduction in quality was very low and negligible in the Yazd-Ardakan aquifer during the studied period. The temporal trends of SO₄^2-, Na⁺ and TDS had either a negative significant trend or no trend in the Yazd area. Considering ranking maps, TDS, Cl^- and Mg²⁺ had high impacts on determining the GQI. These trends were positive in Yazd city and consequently the GQI maps could not confirm the negative temporal trend and zoning maps. This finding showed that the use of qualitative indicators could neutralize the effects of the parameters on each other and provide a better and acceptable result. In all, the transfer water with appropriate quality could control the increase of the TDS, SO₄^2-, Na and caused an increase in Cl^- in these areas. There are many effective factors to study water quality, so its description seems to be difficult. Therefore, using water quality indicators can provide total water quality conditions in a concise and understandable way.
 
 

Keywords

Groundwater quality index; Mann-Kendal; Sen's slope; Water transfer Yazd_Ardakan

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