원주천 수질개선 방안 및 개선효과 평가

초록

Recently, the deterioration of water quality in Wonju stream has been reported due to the increase in diverse pollution sources along with communitydevelopment and urbanization. Various types of attempts with a huge budget were made for better water quality so far, but its effectiveness is stilldoubted. In order to establish site-oriented measures for water quality improvement, the topographic and hydrologic factors were evaluated based onsite inspection and survey. As the major streams merged into the Wonju stream, the Hwa and Heungyang streams were found to have higher pollutionloads and contributions compared to other streams due to the scattered livestock farms and industries, and vulnerable land use. Notably, the dischargewater from the Wonju Public Sewage Treatment Plant had the highest level of pollution load, impacting on the water quality of Wonju Stream. According to the SWAT model as water quality measures, the improvement effect of water quality in this treatment plant can be reached to thereductions in BOD 11.06%, T-N 23.56%, T-P 10.60% when the proper managements applied, whereas the improvement of water quality would be3.89%, 1.23%, and 3.32% for BOD, T-N, T-P, respectively, for the industries. The reduction of the livestock industry was generally very high as apollution source, but it was not much higher at the end of Wonju Stream than other measures. These results recommended that the w ater q ualityimprovement measures should be designated for each upper-middle-lower section in Wonju stream.

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