雅鲁藏布江流域水化学时空变化及其控制因素

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Abstract

In order to study the characteristics of the water chemistry of the Yarlung Tsangpo River and its control factors, 212 water samples from the mainstream of the Yarlung Tsangpo River and its tributaries were collected in the three water periods in 2016. The mathematical statistics, Piper three-line map, Gibbs model, and ion ratio were analyzed. The hydrochemical characteristics of rivers in the whole basin, and the evolution of water chemistry in the basin. The results showed that the cations in the river water were dominated by Ca²⁺, Na⁺, and Mg²⁺; the anions were dominated by HCO₃^- and SO₄^2-; the average value of TDS was 204.51mg/L, the degree of salinity is relatively low; the type of water chemistry is dominated by HCO₃·SO₄ (SO₄·HCO₃)-Ca·Mg (Mg·Ca) type water; The main ion concentration changes in the main stream of Yarlung Tsangpo fluctuated, and the seasonal changes were significant. Spatially, most ions in the river follow the trend of increasing first and then decreasing. The chemical samples of water are distributed in the middle left part of the Gibbs model, indicating that the chemical composition of the watershed in the basin is controlled by rock weathering. Principal component analysis and related analysis show that the Yarlung Tsangpo River Basin The chemical composition of water is controlled by human influence, and weathering of calcite, dolomite and dissolution of sulfuric acid also play a very important role. The vast majority of heavy metals in the three watersheds of the basin meet the requirements of Class I water bodies in surface waters.

Key words： hydrochemical Yarlung Tsangpo River spatio-temporal variations river water quality

Received: 02 April 2018

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	Articles by authors
	LIU Jia-ju
	ZHAO Yu-shun
	HUANG Xiang
	GUO Huai-cheng

Cite this article:

LIU Jia-ju,ZHAO Yu-shun,HUANG Xiang等. Spatiotemporal variations of hydrochemistry and its controlling factors in the Yarlung Tsangpo River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(11): 4289-4297.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I11/4289

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