시공간적 수질변동 분석을 통한 유역관리방안

The objective of this study was to analyze long term temporal trends of water chemistry and spatial heterogeneity for 8 sampling sites of Geum-River watershed using water quality dataset during 2005~2009. The water quality, based on multi-parameters of biochemical oxygen demand (BOD), total nitrogen (TN), and total phosphorus (TP), largely varied depending on the landuse patterns, years and seasons. The characteristics of water quality in the upper regions showed good grade(BOD<3 mg/L) in the Geum river kongju. The resulted in the inflow of domestic, industrial, and livestock wastewaters not adequately treated by wastewater treatment systems. The characteristics of water quality in the upper regions showed <0.9 mg/L BOD) in the yongdam dam and daecheong dam. The high level of COD resulted in the inflow of untreated sewage and the effluent from Wastewater treatment plant into the water body in the river basin. For TN and TP concentrations ranging from 4.21 mg/L to 9.12 mg/L and 0.03 mg/L to 0.15 mg/L, respectively, and the nutrients showed large longitudinal gradients between the upper and lower reach. This resulted in the inflow of domestic, industrial and livestock wastewater not adequately treated by wastewater treatment systems.