Abstract
Time series analyses (autocorrelation, spectral density, and cross-correlation) and principal component analysis (PCA) were used to understand the characteristics of the selected hydrochemical parameters pH, turbidity, alkalinity, Cl, hardness, total dissolved solids (TDS), and metals Fe and Mn in the Nakdong River, South Korea. Autocorrelation and spectral density for pH, alkalinity, hardness, and Cl were very similar to TDS, whereas Fe, Mn, and turbidity showed different trends from TDS. Cross-correlograms of pH, alkalinity, hardness, and Cl versus TDS were very similar to each other. Those of Fe and turbidity represented the opposite relations with other components. Cross-correlation coefficients had the highest values at zero lag, indicating that pH, alkalinity, hardness, and Cl are controlling factors for TDS. On the other hand, Fe and turbidity showed the highest values at 6-month lag and Mn at a month lag. PCA indicated that TDS had very close relation with hardness, pH, and Cl and very small relation with Mn. Turbidity and Fe had relatively opposite relations with TDS. It was concluded that the geostatistical methods were very useful for evaluating the hydrochemical characteristics of the Nakdong River water in South Korea.
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Acknowledgments
The authors are grateful to two anonymous referees for their constructive comments and suggestions which led to significant improvements to the manuscript. We wish to gratefully acknowledge the valuable suggestions given by Prof. Yu-Pin Lin, Associate Editor which greatly helped in the final presentation of this article. This research was supported by a grant (Code: 13AWMP-B066761-02) from AWMP Program funded by the Ministry of Land, Infrastructure and Transport of Korean government. The water quality data of the Nakdong River were supplied from the Busan Metropolitan City, South Korea, and many thanks are given to it.
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Chung, S.Y., Venkatramanan, S., Park, N. et al. An assessment of selected hydrochemical parameter trend of the Nakdong River water in South Korea, using time series analyses and PCA. Environ Monit Assess 187, 4192 (2015). https://doi.org/10.1007/s10661-014-4192-9
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DOI: https://doi.org/10.1007/s10661-014-4192-9