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Hydrochemical Characteristics of River in a Representative Silicate Rock Region under Natural Weathering and Anthropogenic Activities (Vol. 49, No.4, Tot No.342 2021) TEXT SIZE: A A A
-A Case Study of the Fuhe River in the Middle and Lower Reaches of the Yangtze River (Vol. 49, No.4, Tot No.342 2021)

LI Jianhua1, ZHENG Fangwen2, WU Chao1, HUANG Cheng2, TANG Chun2, PENG Yiwei3, XU Chunxia2, YANG Haiquan4

(1.Jiangxi Provincial Water Conservancy Planning Design and Research Institute, Nanchang, 330099, China;
2.School of Hydraulic and Ecological Engineering, Nanchang Institute of Technology, Nanchang, 330099, China;
3.School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan, 430078, China;
4. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China;)

Abstract: The Fuhe River is an important tributary of the Middle and Lower Reaches of Yangtze River and flows into the Poyang Lake, which is the largest freshwater lake in China. Hydrochemical composition of the Fuhe River represents a typical silicate rock area. The water samples from the main stream and the tributaries were systematically collected in January 2019 and were subjected to the analysis of the spatial variations of hydrochemistry, controlling factors and main ion sources by methods such as the principal component analysis and the ion ratio analysis. The results showed that the main cation and anion in runoffs were K+, Na+ and HCO3-, that accounted for 67% and 61.4% of total cation and anion ions respectively. The average TDS value (49.51 mg/L) is lower than the world average. Chemical weathering of silicate rocks is the primary factor that controls the characteristics of the water, rainfall and water vaporization are another influencing factors, in which, water from seawater was estimated to contribute 7.35% of total river hydrochemistry. Cl-, HCO3- and SO42- in Fuhe basin are mainly derived from agricultural effluent, industrial pollution and municipal sewage, with different shares of these inputs at different parts of the?river. The increase of SO42- and Cl- in water from the upstream to the downstream indicates that anthropogenic activities have a significant impact on the river water chemistry.

Key word: Fuhe River; hydrochemistry; ion sources; natural weathering; human activity

EARTH AND ENVIRONMENT Vol.49, No.4, Tot No.342, 2021, Page 347-357

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