Hydrochemical regime and its mechanism in Yamzhog Yumco Basin, South Tibet

文献类型： 外文期刊

第一作者： Zhe, Meng

作者： Zhe, Meng;Zhang, Xueqin;Wang, Buwei;Zheng, Du;Zhe, Meng;Wang, Buwei;Sun, Rui

作者机构：

关键词： hydrochemical regime;control mechanism;Piper diagram;Gibbs model;Yamzhog Yumco Basin;alpine lake

期刊名称：JOURNAL OF GEOGRAPHICAL SCIENCES （ 影响因子：3.534； 五年影响因子：3.647 ）

ISSN： 1009-637X

年卷期： 2017 年 27 卷 9 期

页码：

收录情况： SCI

摘要： The hydrochemistry of alpine lakes reflects water characteristic and its response to climatic change. Over 300 water samples had been collected from 52 sites of 5 lakes and 7 inflowing rivers in the Yamzhog Yumco Basin, South Tibet, during 2009-2014, basing which the hydrochemical regime and its mechanism were analyzed along with the adoption of hydrological investigations in 1979 and 1984 as well. Results revealed that the waters were hard with weak alkalinity for the Yamzhog Yumco Basin. Most of them were fresh, and the rest were slightly saline. The hydrochemical types of 5 lakes (i.e., Lake Yamzhog Yum Co, Puma Yum Co, Bajiu Co, Kongmu Co, and Chen Co) were SO4 (2-)-HCO3 (-)-Mg2+-Na+, HCO3 (-)-SO4 (2-)-Mg2+-Ca2+, SO4 (2-)-Mg2+-Na+, SO4 (2-)-HCO3 (-)-Ca2+, and SO4 (2-)-Na+-Mg2+-Ca2+, respectively. As for rivers, HCO3 (-) and SO4 (2-) were the major anions, and Ca2+ was the dominant cation. Lake Yamzhog Yum Co, the largest lake in the basin, exhibited remarkable spatial variations in hydrochemistry at its surface but irregular changes with depth. The weathering of evaporates and carbonates, together with evaporation and crystallization, were the major mechanisms controlling the hydrochemistry of waters in the Yamzhog Yumco Basin. Global warming also had significant impacts on hydrochemical variations.

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