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신용철 ( Yongchul Shin ),최중대 ( Joongdae Choi ),류창원 ( Kyoungjae Lim ),임경재 ( Changwon Lyou ),신민환 ( Minhwan Shin ),최용훈 ( Yonghun Choi ),김기성 ( Kisung Kim ),허성구 ( Sunggu Heo ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
Forest watershed, located in Chuncheon-si, Gangwon province, Korea, is selected to analyze characteristics of the pollutant loads with water quality sampling frequencies. In 2005, the yearly streamflow of the forest watershed was 43,265,325 ㎥ and 61% of that was intensively generated from June to September. Pollutant loads of T-N, NO<sub>3</sub>-N, and T-P before and after rainy days were over twelve times greater than those during heavy rainy days. However, pollutant loads were not shown some obvious differences between them during rainy and dry days, respectively. When water quality frequencies were collected in the range of 4~32, relative errors of pollutant loads were highly shown over 13 to 31%, respectively. However, relative errors of T-N and NO<sub>3</sub>-N, on which water sampling frequencies were augmented over 36~40 times, were shown less than 10% and those of T-P were gradually decreased by increasing of sampling frequencies. Therefore, it was strongly thought that over 3 to 5 of water samples during the single rainfall event and 35 to 40 of those during heavy rainy days should be collected to reduce uncertainty of monitoring information and gather some confidential data because concentration values were greatly influenced by the various contents such as the landuse, agricultural management and environmental condition.