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Open AccessArticle

Hydrochemistry and Its Controlling Factors of Rivers in the Source Region of the Nujiang River on the Tibetan Plateau

by Fuqiang Wang 1,2,3, Yang Zhao 1, Xi Chen 4 and Heng Zhao 1,2,*
1
School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
2
Collaborative Innovation Center of Water Resources Efficient Utilization and Support Engineering, Zhengzhou 450046, China
3
Henan Key Laboratory of Water Environmental Simulation and Management, Zhengzhou 450046, China
4
School of Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 2166; https://doi.org/10.3390/w11102166
Received: 28 August 2019 / Revised: 7 October 2019 / Accepted: 14 October 2019 / Published: 17 October 2019
(This article belongs to the Special Issue Geochemistry of Water and Sediment)
The chemical composition of river water collected from the main stream of the Naqu and its tributaries was analyzed to reveal its hydrochemical characteristics and to evaluate the water quality for irrigation purposes. Based on 39 samples, the results revealed mildly alkaline pH values and total dissolved solids (TDS) values ranging from 115 to 676 mg/L, averaging 271 mg/L. Major ion concentrations based on mean values (mg/L) were in the order of Ca 2 + > Na + > Mg 2 + > K + for cations and HCO 3 > SO 4 2 > Cl > CO 3 2 for anions. Most hydrochemical types were of the Ca–HCO3 (~74.36%) type. Cluster analysis (CA) suggested that the hydrochemical characteristics upstream of the main stream of the Naqu were obviously different from those from the middle and downstream of the main stream and its tributaries. The analysis shows that the Sangqu, Basuoqu, Mumuqu, Zongqingqu, Mugequ basin tributary, and the Gongqu basin tributary were mainly affected by carbonate weathering. Carbonate and silicate weathering commonly controlled the hydrochemistry upstream and downstream of the main Naqu, Chengqu, and Mugequ streams. The middle of the main stream of the Naqu was mainly affected by silicate weathering, and anhydrite/gypsum dissolution mainly affected the hydrochemistry of the main Gongqu stream. The quality of water samples was suitable for irrigation purposes, except for one sample from the main stream of the Mugequ. View Full-Text
Keywords: source region of Nujiang river; hydrochemistry; major ions; chemical weathering; Tibetan Plateau source region of Nujiang river; hydrochemistry; major ions; chemical weathering; Tibetan Plateau
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Wang, F.; Zhao, Y.; Chen, X.; Zhao, H. Hydrochemistry and Its Controlling Factors of Rivers in the Source Region of the Nujiang River on the Tibetan Plateau. Water 2019, 11, 2166.

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