Abstract
This study applied a method of the rotated empirical orthogonal functions to directly decompose the space–time groundwater level variations and determine the potential recharge zones by investigating the correlation between the identified groundwater signals and the observed local rainfall records. The approach is used to analyze the spatiotemporal process of piezometric heads estimated by Bayesian maximum entropy method from monthly observations of 45 wells in 1999–2007 located in the Pingtung Plain of Taiwan. From the results, the primary potential recharge area is located at the proximal fan areas where the recharge process accounts for 88% of the spatiotemporal variations of piezometric heads in the study area. The decomposition of groundwater levels associated with rainfall can provide information on the recharge process since rainfall is an important contributor to groundwater recharge in semi-arid regions. Correlation analysis shows that the identified recharge closely associates with the temporal variation of the local precipitation with a delay of 1–2 months in the study area.
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Acknowledgement
This research is supported by a grant from the National Science Council of Taiwan (NSC100-2628-E-002-005-) and National Cheng Kung University. We thank the Water Resources Agency, Taiwan for providing the monitoring data.
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Yu, HL., Chu, HJ. Recharge signal identification based on groundwater level observations. Environ Monit Assess 184, 5971–5982 (2012). https://doi.org/10.1007/s10661-011-2394-y
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DOI: https://doi.org/10.1007/s10661-011-2394-y