ZHANG Lechen1,2 CHEN Xi1,2 ZHANG Zhicai1,2 DING Xianrong2 JIANG Rui1,2 CHEN Xi1,2
(1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;
2.College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China)
Abstract: The principal component analysis (PCA) and the ion ratio analysis on water irons were applied for investigation of hydrochemical characteristics and water-rock interaction in dry and wet periods in the Houzhai River Basin. The research shows that the PCA load value and its site scores can be used to identify the main chemical components and thus water-rock interaction features of the lithology of T2g2 and T2g3 in the study catchment. During the wet period, the identified main components reflect the combination influence of dissolution of carbonate rocks and hydrodynamic condition; in dry season, they reflect the combination influence of evaporite rocks and hydrodynamic condition. Since well-developed conduits and rapid flow in limestones areas, iron concentration is low. However, as the dolomite area increases or the flow decreases, the iron concentration increases. During the dry period, the evaporite rocks take a more significant role on the iron concentration as the flow decreases from upstream to downstream.
Key words: PCA; hydrochemical characteristics; water-rock interaction; ion ratio; PCA load value
EARTH AND ENVIRONMENT Vol.46, No.2, Tot No.322, 2018, Page 114-120
