title: Applying factor analysis combined with kriging and information entropy theory for mapping and evaluating the stability of groundwater quality variation in Taiwan.
abstract: In Taiwan many factors, whether geological parent materials, human activities, and climate change, can affect the groundwater quality and its stability. This work combines factor analysis and kriging with information entropy theory to interpret the stability of groundwater quality variation in Taiwan between 2005 and 2007. Groundwater quality demonstrated apparent differences between the northern and southern areas of Taiwan when divided by the Wu River. Approximately 52% of the monitoring wells in southern Taiwan suffered from progressing seawater intrusion, causing unstable groundwater quality. Industrial and livestock wastewaters also polluted 59.6% of the monitoring wells, resulting in elevated EC and TOC concentrations in the groundwater. In northern Taiwan, domestic wastewaters polluted city groundwater, resulting in higher NH(3)-N concentration and groundwater quality instability was apparent among 10.3% of the monitoring wells. The method proposed in this study for analyzing groundwater quality inspects common stability factors, identifies potential areas influenced by common factors, and assists in elevating and reinforcing information in support of an overall groundwater management strategy.
authors.affiliation: Department of Environmental Management, Tungnan University, Taipei County 222, Taiwan. gsshyu@mail.tnu.edu.tw
authors.forename: Guey-Shin
authors.initials: GS
authors.lastname: Shyu
authors.forename: Bai-You
authors.initials: BY
authors.lastname: Cheng
authors.forename: Chi-Ting
authors.initials: CT
authors.lastname: Chiang
authors.forename: Pei-Hsuan
authors.initials: PH
authors.lastname: Yao
authors.forename: Tsun-Kuo
authors.initials: TK
authors.lastname: Chang
mesh_terms: D016000:Cluster Analysis; D019277:Entropy; D005163:Factor Analysis, Statistical; D040362:Geographic Information Systems; D054712:Salinity; D013624:Taiwan; D014867:Water / Q000032:analysis*; D014881:Water Supply / Q000592:standards / Q000706:statistics & numerical data*
chemical_list: D014867:Water