雅鲁藏布江上游夏季水化学特征及来源解析

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Abstract To explore inorganic hydrochemical characteristics of the upper Yarlung Zangbo River, water samples were collected from the main stream and different tributaries in this region in August 2020. The chemical compositions and spatial variations as well as the sources of the main ions were analyzed. Results showed that the main anions in the river were HCO₃^- and SO₄^2-, accounted for 71.1% and 23.2% of the total anions, respectively; the main cations were Ca²⁺ and Na⁺, accounted for 47.9% and 34.8% of the total cations, respectively; the total dissolved solids (TDS) ranged between 43.5~187.3mg/L, with an average of 116.4mg/L (this indicated a low salinity of water). The dominate pattern of hydrochemical type in the Yarlung Zangbo River Upstream Basin was HCO₃·SO₄-Ca·Na, while exhibited HCO₃-Ca·Na pattern in some headwater (i.e., Jiemayangzong river and Kubi river). Then, there existed drastically changes of HCO₃^-, SO₄^2-, and Ca²⁺ along the mainstream, which was mainly affected by glacier melt water and the inflow water from different tributaries. In general, in the upper Yarlung Zangbo River, the hydrochemical characteristics was controlled by rock weathering with the ions mainly originated form the carbonate rock and silicate, and the evaporite (sulfate) dissolution was also another source. In contrast, this area was less affected by human activities.

Key words： Upper Yarlung Zangbo River glacier meltwater hydrochemical characteristics ion sources rock weathering

Received: 02 July 2021

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X522

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	Articles by authors
	YAN Yu-peng
	NIU Feng-xia
	LIU Jia
	LIU Xin-ting
	LI Ying
	PENG Hui
	YAN Deng-hua
	XIAO Shang-bin

Cite this article:

YAN Yu-peng,NIU Feng-xia,LIU Jia等. Hydrochemical characteristics and sources of the upper Yarlung Zangbo River in summer[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 815-825.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/815

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