气候变化领域集成服务门户(CCPortal): Spatiotemporal variations of hydrogeochemistry and its controlling factors in the Gandaki River Basin, Central Himalaya Nepal

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DOI	10.1016/j.scitotenv.2017.12.063
	Spatiotemporal variations of hydrogeochemistry and its controlling factors in the Gandaki River Basin, Central Himalaya Nepal
	Pant, Ramesh Raj; Zhang, Fan; Rehman, Faizan Ur; Wang, Guanxing; Ye, Ming; Zeng, Chen; Tang, Handuo
通讯作者	Zhang, F (通讯作者)
发表日期	2018
ISSN	0048-9697
EISSN	1879-1026
起始页码	770
结束页码	782
卷号	622
英文摘要	The characterization and assessment of water quality in the head water region of Himalaya is necessary, given the immense importance of this region in sustaining livelihoods of people and maintaining ecological balance. A total of 165 water samples were collected from 55 sites during pre-monsoon, monsoon and post-monsoon seasons in 2016 from the Gandaki River Basin of the Central Himalaya, Nepal. The pH, EC values and TDS concentrations were measured in-situ and the concentrations of major ions (Ca2+, Mg2+, K+, Na+, Cl-, SO42-, NO3-) and Si were analyzed in laboratory. Correlation matrices, paired t-test, cluster analysis, principal component analysis (PCA), the Piper, Gibbs, and Mixing plots, and saturation index were applied to the measurements for evaluating spatiotemporal variation of the major ions. The results reveal mildly alkaline pH values and the following pattern of average ionic dominance: Ca2+ >Mg2+ >Na+ > K+ for cations and HCO3- > SO42- > Cl- > NO3- for anions. The results of PCA, Gibbs plot and the ionic relationships displayed the predominance of geogenic weathering processes in areas with carbonate dominant lithology. This conclusion is supported by geochemically different water facies identified in the Piper plot as Ca-HCO3 (83.03%), mixed Ca-Mg-Cl (12.73.0%) and Ca-Cl (4.24%). Pronounced spatiotemporal heterogeneity demonstrates the influence of climatic, geogenic and anthropogenic conditions. For instance, the Ca2+-SO42-, Mg2+-SO42- and Na+-Cl-pairs exhibit strong positive correlation with each other in the upstream region, whereas relatively weak correlation in the downstream region, likely indicating the influence of evapo-crystallization processes in the upstream region. Analyses of the suitability of the water supply for drinking and irrigation reveal that the river has mostly retained its natural water quality but poses safety concern at a few locations. Knowledge obtained through this study can contribute to the sustainable management of water quality in the climatically and lithologically distinct segments of the Himalayan river basins. (c) 2017 Elsevier B.V. All rights reserved.
关键词	MAJOR-ELEMENT CHEMISTRY TROPICAL MOUNTAIN RIVER SOUTHERN WESTERN-GHATS WEATHERING PROCESSES SEASONAL-VARIATION ION CHEMISTRY WATER-QUALITY INDUS RIVER LAND-USE GEOCHEMISTRY
英文关键词	Major ions; Spatiotemporal variations; Controlling factors; Chemical weathering; Himalayan River Basin
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000426349000080
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259324
推荐引用方式 GB/T 7714	Pant, Ramesh Raj,Zhang, Fan,Rehman, Faizan Ur,et al. Spatiotemporal variations of hydrogeochemistry and its controlling factors in the Gandaki River Basin, Central Himalaya Nepal[J]. 中国科学院青藏高原研究所,2018,622.
APA	Pant, Ramesh Raj.,Zhang, Fan.,Rehman, Faizan Ur.,Wang, Guanxing.,Ye, Ming.,...&Tang, Handuo.(2018).Spatiotemporal variations of hydrogeochemistry and its controlling factors in the Gandaki River Basin, Central Himalaya Nepal.SCIENCE OF THE TOTAL ENVIRONMENT,622.
MLA	Pant, Ramesh Raj,et al."Spatiotemporal variations of hydrogeochemistry and its controlling factors in the Gandaki River Basin, Central Himalaya Nepal".SCIENCE OF THE TOTAL ENVIRONMENT 622(2018).