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Title of Journal: Chin Sci Bull

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Abbravation: Chinese Science Bulletin

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SP Science China Press

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DOI

10.1007/bf03221381

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1861-9541

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Formations of groundwater hydrogeochemistry in a k

Authors: PingHeng Yang DaoXian Yuan WenHao Yuan YingLun Kuang Peng Jia QiuFang He
Publish Date: 2010/05/06
Volume: 55, Issue: 14, Pages: 1412-1422
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Abstract

Highfrequency samples have been collected at Jiangjia Spring the outlet of Qingmuguan underground river system QURS in Chongqing in late April 2008 The variations of hydrogeochemical compositions are found responding rapidly to storm events Principal component analysis PCA of the 20 variables is employed to interpret the relationships with specific processes that control the groundwater hydrogeochemical formations Through PCA 84961 of the total amount information is extracted to indicate the formations of groundwater hydrogeochemical features in QURS during storm events The first component separates the soil erosion ie increases in turbidity and concentrations of Al3+ TFe TMn Ba2+ and NO2 − and dilution effect ie decreases in specific conductance and concentrations of HCO3 − Ca2+ and Sr2+ accounting for 41495 of the variability in the data The second component indicates residual fertilizers and duck’s waste from farmlands ie increases in specific conductance and concentrations of Na+ NO3 − PO4 3− K+ and Cl− contributing to 37449 The dissolution of dolomite and dolomitic limestone makes up 6017 During the first rainfall event the groundwater quality is mainly affected by residual fertilizers and duck’s waste from farmlands whereas in the second rainfall event it is mainly affected by increased turbidity and ionic concentrations caused by soil erosion

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