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Factors Affecting the Spatial Pattern of Nitrate Contamination in Shallow Groundwater

School of Earth and Environmental Sciences (BK21 SEES), Seoul National Univ., Seoul 151-747, Korea

View larger version (52K): [in this window] [in a new window]   Fig. 1. Location map of the Yupori site (Chuncheon, Korea) and the layout of the groundwater sampling wells.

View larger version (36K): [in this window] [in a new window]   Fig. 2. Spatial distributions of NO3–N concentrations at each sampling period (April 2002; February 2003; June 2003; August 2003; February 2004; and May 2004). Dashed lines indicate the contour lines of the measured groundwater table in meters for August 2004.

View larger version (98K): [in this window] [in a new window]   Fig. 3. Land use pattern of the Yupori site.

View larger version (24K): [in this window] [in a new window]   Fig. 4. Piper plots showing the various chemical compositions of the groundwater sampled in (a) February and (b) August 2004 (•: Group A, +: Groups B and D, and : Group C).

View larger version (12K): [in this window] [in a new window]   Fig. 5. Dendrogram of the cluster analysis of the data sampled in (a) February and (b) August 2004.

View larger version (21K): [in this window] [in a new window]   Fig. 6. Distribution of each clustered group for the data collected in (a) February and (b) August 2004 (•: Group A, +: Groups B and D, and : Group C).

View larger version (36K): [in this window] [in a new window]   Fig. 7. Box plots of the major chemical components in each clustered group (A, B, C, and D indicate Groups A, B, C, and D, respectively).

View larger version (13K): [in this window] [in a new window]   Fig. 8. Observed NO3–N concentration vs. the predicted NO3–N concentration based on Tobit regression using variables including land use and topography [(a) land slope and (b) elevation].