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Classification and Characterization for Water Level Time Series of Shallow Wells at the National Groundwater Monitoring Stations  

Kim, Gyoo-Bum (National Groundwater Information Management and Service Center, KWATER (Michigan Water Science Center, U.S. Geological Survey))
Yum, Byoung-Woo (Groundwater and Geothermal Resources Division, KIGAM (Headquarters, U.S. Geological Survey))
Publication Information
Journal of Soil and Groundwater Environment / v.12, no.5, 2007 , pp. 86-97 More about this Journal
Abstract
The principal component analysis was performed to identify the general characteristics of groundwater level changes from 202 deep and 112 shallow wells monitoring data, respectively, which came from the National Groundwater Monitoring Stations operated by KWATER with time spans of 156 continuous weeks from 2003 to 2005. Eight principal components, which accounted for 80% of the variability of the original time series, were extracted for water levels of shallow and deep monitoring wells. As a result of cluster analysis using the loading value of three principal components for shallow wells, shallow monitoring wells were divided into 3 groups which were characterized with a response time to rainfall (Group 1: 4.6 days, Group 2: 24.1 days, Group 3: 1.4 days), average long-term trend of water level (Group 1: $2.05{\times}10^{-4}$ m/day, Group 2: $-7.85{\times}10^{-4}$ m/day, Group 3: $-3.51{\times}10^{-5}$ m/day) and water level difference (Group 1 < Group 2 < Group 3). Additionally, they showed significant differences according to a distance to the nearest stream from well (Group 3 < Group 2 < Group 1), topographic slope of well site (Group 3: plain region, Group 1: mountainous region) and groundwater recharge rate (Group 3 < Group 2 < Group 1) with a p-value of 0.05.
Keywords
National Groundwater Monitoring Stations; groundwater levels; principal component analysis; cluster analysis;
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