Trend Changes Analysis of the Water Quality in the Talar River Watershed Using the Man-Kendall (MK) Test

Subject Areas : WATER RESOURCES

zahra  sohrabizadeh ¹ (Ph.D. candidate at Desertification, University of Yazd, Iran)
Ehsan  Sharifi Moghadam ² (Ph.D. candidate at Watershed Engineering, Tarbiat Modares University, Faculty of Natural Resources and Marine Sciences, Noor, Iran)
Mohammad Ali  Hakimzadeh ³ (Faculty of Natural Resources and Desert Study, University of Yazd ,Iran)

Received: 2018-04-22 Accepted : 2018-12-01 Published : 2018-12-22

Keywords: Water Quality, Talar River, TDS, Man-Kendall,

Abstract :

One of the most important subjects in hydrology science is the water quality of the rivers, because of major hydrology activities for water supply in agriculture, drinking and, industry. The water quality index is one of the most widely used indicators for the classification of surface water quality. Therefore, the present study has been the analysis of long-term changes in the Talar Watershed using indicators of Na, SO4, and TDS and also the trend of these indices using non-parametric Man-Kendall test. Three stations with statistics were selected at the Talar watershed during the period from 1348 to 1392 and applied the Man-Kendall test on their annual and seasonal data. The results of this study indicate a significant uptrend in annual and seasonal Na and TDS amounts, but the SO4 trend has been a significant uptrend only in the annual and the spring data and in other seasons it has been non-significant uptrend at a 95% confidence level. The quality of water samples according to the Schoeller diagram is optimal for Na and SO4 indices and to the extent permitted for the TDS index.The cause of water pollution in the Talar river and the additive and the upward trend of these indicators may be due to increased human intervention and agricultural around the river, as well as the entry of domestic and industrial wastewater to the river which will make the river ecosystem be at risk and destroyed.

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