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http://dx.doi.org/10.3741/JKWRA.2020.53.5.337

Analysis of groundwater level variability in the middle mountain area of Pyoseon watershed in Jeju Island using normalized standard deviation and cross correlation coefficient  

Shin, Mun-Ju (Water Resources Research Team, Jeju Province Development Corporation)
Moon, Soo-Hyoung (Water Resources Research Team, Jeju Province Development Corporation)
Moon, Duk Chul (Water Resources Research Team, Jeju Province Development Corporation)
Publication Information
Journal of Korea Water Resources Association / v.53, no.5, 2020 , pp. 337-345 More about this Journal
Abstract
In order to provide information for proper management of groundwater resources, an analysis of the effects of precipitation and groundwater withdrawal on groundwater levels is needed. In this study, we analyzed the correlation of precipitation-groundwater level and groundwater withdrawal-groundwater level using time series data converted by normalized standard deviation (Nor.St.Dev) and cross correlation coefficient (CCC) for nine groundwater monitoring wells in the middle mountainous area in the southeastern Jeju Island. First, the CCCs of precipitation-groundwater level were estimated using daily time series data, and the low CCCs of up to 0.3 were obtained. However, the result of using the Nor.St.Dev showed a clearer correlation by obtaining a CCC of up to 0.8. In addition, in most cases, precipitation variability and groundwater level variability had positive CCCs, whereas groundwater withdrawal variability and groundwater level variability had negative CCCs. Therefore, the groundwater level in this study area was largely influenced by precipitation with little effect of groundwater withdrawal. Lastly, as a result of analyzing the relative effects of Seongpanak and Gyorae rainfall station on the groundwater level, the rainfall at the relatively downstream Gyorae rainfall station has more influence. The analysis method used in this study can be easily used for analyzing the effects of precipitation and groundwater withdrawal on groundwater level variability in other regions in the future.
Keywords
Normalized standard deviation; Cross correlation coefficient; Groundwater level variability; Precipitation effect; Pyoseon watershed in Jeju Island;
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