Li Q.,Xinjiang Agricultural University |
Zhou J.-L.,Xinjiang Agricultural University |
Zhou J.-L.,Wuhan University |
Yang G.-Y.,Wuhan University |
And 4 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences
The salinization of deep groundwater is one of the serious geographical environmental hazards. The present study collected groundwater samples from 60 wells with depths >100 m in Xinjiang plain areas from October to November of 2011. We compared hydrochemical data obtained in 2011 and 2003 in the same wells. The results show that 16 groundwater samples are seriously salinized among 60 groundwater samples. The increase rates of TDS, Cl- and SO4 2- are over 10%. These sampling points are located in Aksu, Bayingolin, Bortala, Hotan, Kashkar, Tacheng Prefecture and Urumqi City. The salinization coefficient > 2 is observed in some sampling sites for deep groundwater in Aksu and Kashkar Prefecture, between 1 and 2 in Bayingolin, Kashkar and Turfan Prefecture, and <1 in the remaining sampling points. The increase in TDS of deep groundwater in the two sampling points of Turfan Prefecture is 532.5 mg/L and 1828.9 mg/L respectively. Total hardness increases by 348.0 mg/L and 1039.4 mg/L respectively. The conclusions are as follows: Salinization occurs in a spot-like pattern in Xinjiang plain areas. 16 groundwater samples are seriously salinized among 60 ones, which make up 26.7% of the total wells sampled. Salinization of deep groundwater in Turfan Prefecture is the most severe among all prefectures and cities. Through the analysis of the characteristics of salinization of deep groundwater in this region, three causes of salinization and four countermeasures to prevent the salinization are found. Source