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저수구역 경작지 토양의 유기물 및 영양염류 용출특성 분석
유나영 ( Yu Nayeong ),신민환 ( Shin Minhwan ),임정하 ( Lim Jungha ),금동혁 ( Kum Donghyuk ),남창동 ( Nam Changdong ),임경재 ( Lim Kyoungjae ),김종건 ( Kim Jonggun ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.1
Soils in agricultural lands contain large amount of organic matter and nutrients due to the injected fertilizers and manure. During heavy rain, surface water and base runoff pollutants flows into a nearby stream or lake with eroded soil from agricultural lands. On the other hands, agricultural lands near the lake are inundated due to the increase of the water level in the lake, leading to organic matter and nutrient release from the inundated soil. In this study, releasing rates of nutrient salts and organic substances were analyzed for the soil in the agricultural land, where cultivation activities has been carried out and periodically flooded, to account for the possibility of contamination from the inundated agricultural land in reservoir areas The experiment results have shown that COD was released from the soil in anaerobic conditions, and T-P was released in both anaerobic and aerobic conditions. However, in the case of T-N, it was found that the runoff by soil was not made before the rainfall occurred, and when the soil was impound due to rainfall, the elution occurred under the aerobic conditions. Through the results of this study, it was possible to account for the effect of flooded agricultural lands on the water quality in the lake, and this could be reflected in an efficient agricultural non-point pollution management policy. In order to determine the precise releasing rate for each agricultural land, it is believed that the leaching experiment for paddy fields and grasslands are needed.
권혁준 ( Kwon Hyeokjoon ),홍다혜 ( Hong Dahye ),변상돈 ( Byeon Sangdon ),임경재 ( Lim Kyoungjae ),김종건 ( Kim Jonggun ),남창동 ( Nam Changdong ),홍은미 ( Hong Eunmi ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.3
The Doam Lake Watershed is one of Gangwon-do’s non-point source management areas. This area has a lot of snowfall in winter, and it is expected that there will be a lot of soil erosion in early spring due to snow melting. In this study, snow melting was monitored in the Doam Lake watershed from February to 3, 2020. It was conducted to analyze the water quality changes by calculating the concentration of non-point source pollution caused by snowmelt, and to compare the concentration of water quality during snowmelt event with rainfall and non-rainfall event. As a result of water quality analysis, Event Mean Concentration (EMC) at the first monitoring was SS 33.9 mg/L, TP 0.13 mg/L, TN 4.33 mg/L, BOD 1.35 mg/L, TOC 1.84 mg/L. At the second monitoring, EMC were SS 81.3 mg/L, TP 0.15 mg/L, TN 3.12 mg/L, BOD 1.32 mg/L, TOC 3.46 mg/L. In parameter except SS, it showed good water quality. It is necessary to establish management measures through continuous monitoring.