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Comparison of Unit Load from Paddy Field by Various Estimation Methods

최동호 1 Jaewoon Jung 2 Yoon, KwangSik 3 Woo-Jung Choi 3 Sohyun Cho 4 범진아 4 유승화 4

1전남대학교 지역바이오시스템공학과
2전라남도 환경산업진흥원
3전남대학교
4국립환경과학원 영산강물환경연구소

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ABSTRACT

The unit load of paddy field was estimated by several methods and compared in this study. Four year field study was conducted at the paddy fields located in Yeongsan river and Sumjin river basins. The unit load was estimated by four methods; ①averaging field monitored load; ②NIER (National Institute of Environmental Research) method which use EMC(Event Mean Concentration) and runoff ratio of rainfall groups with rainfall weighting factors; ③method using EMC determined by best fit probability distribution; ④method using arithmetic mean EMC and runoff ratio. The result of this study showed that the unit loads of water quality constituents by field monitoring was similar to those of NIER method whereas those by probability distribution(log-normal, gamma) method were less than unit loads of NIER method. The unit loads by arithmetic mean EMC and runoff ratio were larger than those by NIER method. The unit load by NIER method showed higher BOD, COD, SS, lesser T-N, and similar T-P values when compared to unit loads determined by MOE in 1995.

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