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• W2906744043 abstract "To make an overall assessment of the groundwater quality in Seoul city, we used the self-organizing map (SOM) technique in combination with fuzzy c-means (FCM) clustering. SOM visualizes complicate and multidimensional data structures on a 2D surface while the FCM algorithm creates overlapping cluster boundaries among samples that are continuously distributed over a data space. The combination of SOM and FCM clustering was expected to help characterize highly complicated urban groundwater quality. As a result, the SOM characterized 343 groundwater samples using 91 neurons, which were further classified by FCM clustering into three water groups. Group 1 addressed the least polluted groundwater (17% of the samples (n = 58), average TDS = 194.5 mg/L and NO3 = 6.9 mg/L) and occurred in the peripheral areas whose land cover is mainly occupied by forests. Increasing pH with increasing sodium and bicarbonate concentrations indicated that the hydrogeochemistry of Group 1 was largely controlled by water-rock interactions. Group 2 included the highly polluted groundwater (24% of the samples (n = 82), average TDS = 326.2 mg/L and NO3 = 42.6 mg/L), and sporadically occurred in Seoul, with no distinct spatial control. This group seemed to be affected by sewage from broken sewer pipes, which are a primary pollution source of Seoul groundwater and are ubiquitously distributed beneath the city. Group 3 water also represented the highly contaminated groundwater (30% of the samples (n = 103), average TDS = 527.1 mg/L), but contained low nitrate concentrations (average NO3 = 13.1 mg/L). Based on their spatial locations, intensive groundwater pumping from subway tunnels and other underground spaces at the city center seemed to drive the induced flow of organic contaminants, resulting in local reducing conditions sufficient for denitrification. The remaining 100 samples (29% of the samples) shared the hydrogeochemical properties of two or three groups. This study successfully characterized the spatial pattern of urban groundwater quality that is complicated by various contamination sources and hydrogeochemical processes. The combined use of SOM and FCM clustering was proven as a powerful tool to interpret nonlinear and highly heterogeneous environmental data for which it is difficult to define cluster boundaries. Taken together, our results contribute to a better management of urban groundwater in metropolitan cities under high risks of anthropogenic contamination." @default.
• W2906744043 created "2019-01-11" @default.
• W2906744043 creator A5005636037 @default.
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• W2906744043 date "2019-02-01" @default.
• W2906744043 modified "2023-10-14" @default.
• W2906744043 title "The combined use of self-organizing map technique and fuzzy c-means clustering to evaluate urban groundwater quality in Seoul metropolitan city, South Korea" @default.
• W2906744043 cites W1441325336 @default.
• W2906744043 cites W1567396826 @default.
• W2906744043 cites W1708588932 @default.
• W2906744043 cites W1710755628 @default.
• W2906744043 cites W1822924132 @default.
• W2906744043 cites W1963568149 @default.
• W2906744043 cites W1964314607 @default.
• W2906744043 cites W1966150403 @default.
• W2906744043 cites W1966339450 @default.
• W2906744043 cites W1966482028 @default.
• W2906744043 cites W1969425247 @default.
• W2906744043 cites W1976119057 @default.
• W2906744043 cites W1976213823 @default.
• W2906744043 cites W1979270704 @default.
• W2906744043 cites W1979495695 @default.
• W2906744043 cites W1979583227 @default.
• W2906744043 cites W1981576673 @default.
• W2906744043 cites W1984162388 @default.
• W2906744043 cites W1984257790 @default.
• W2906744043 cites W1985169984 @default.
• W2906744043 cites W1985486770 @default.
• W2906744043 cites W1995450389 @default.
• W2906744043 cites W1998371716 @default.
• W2906744043 cites W2000393684 @default.
• W2906744043 cites W2002196211 @default.
• W2906744043 cites W2002483425 @default.
• W2906744043 cites W2006069525 @default.
• W2906744043 cites W2006183977 @default.
• W2906744043 cites W2006522572 @default.
• W2906744043 cites W2007065306 @default.
• W2906744043 cites W2011373394 @default.
• W2906744043 cites W2013740555 @default.
• W2906744043 cites W2018513810 @default.
• W2906744043 cites W2023637201 @default.
• W2906744043 cites W2023983688 @default.
• W2906744043 cites W2025597305 @default.
• W2906744043 cites W2026213193 @default.
• W2906744043 cites W2026759280 @default.
• W2906744043 cites W2027832294 @default.
• W2906744043 cites W2033179932 @default.
• W2906744043 cites W2033923757 @default.
• W2906744043 cites W2036256125 @default.
• W2906744043 cites W2038541467 @default.
• W2906744043 cites W2039102726 @default.
• W2906744043 cites W2040333107 @default.
• W2906744043 cites W2043166122 @default.
• W2906744043 cites W2046786192 @default.
• W2906744043 cites W2049434165 @default.
• W2906744043 cites W2050989395 @default.
• W2906744043 cites W2058720760 @default.
• W2906744043 cites W2065699343 @default.
• W2906744043 cites W2066529279 @default.
• W2906744043 cites W2069479834 @default.
• W2906744043 cites W2069575758 @default.
• W2906744043 cites W2071962893 @default.
• W2906744043 cites W2074197013 @default.
• W2906744043 cites W2078972451 @default.
• W2906744043 cites W2083686278 @default.
• W2906744043 cites W2084212577 @default.
• W2906744043 cites W2084993267 @default.
• W2906744043 cites W2087872933 @default.
• W2906744043 cites W2088618411 @default.
• W2906744043 cites W2089686530 @default.
• W2906744043 cites W2089814033 @default.
• W2906744043 cites W2089965556 @default.
• W2906744043 cites W2092884728 @default.
• W2906744043 cites W2093470216 @default.
• W2906744043 cites W2101687239 @default.
• W2906744043 cites W2110802877 @default.
• W2906744043 cites W2112265121 @default.
• W2906744043 cites W2116178303 @default.
• W2906744043 cites W2130890620 @default.
• W2906744043 cites W2148492494 @default.
• W2906744043 cites W2149828813 @default.
• W2906744043 cites W2154477585 @default.
• W2906744043 cites W2164303307 @default.
• W2906744043 cites W2164920486 @default.
• W2906744043 cites W2171975443 @default.
• W2906744043 cites W2202428548 @default.
• W2906744043 cites W2241615055 @default.
• W2906744043 cites W2467288107 @default.
• W2906744043 cites W2468468849 @default.
• W2906744043 cites W2469443102 @default.
• W2906744043 cites W2519162789 @default.
• W2906744043 cites W2570424861 @default.
• W2906744043 cites W2782481080 @default.
• W2906744043 cites W2792126966 @default.

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