저수지 관개지구의 농업용수 회귀 특성 분석
Characteristics of Irrigation Return Flow in a Reservoir Irrigated District
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조회
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다운로드
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참고문헌
키워드
초록
The objective of this study was to investigate characteristics of irrigation return flow from paddy block in a reservoir irrigated district during growingseasons. The irrigation return flow was divided into three parts, quick return flow from irrigation canal (RFI), quick return flow from drainage canal(RFD), and delayed return flow (DRF). The RFI was calculated from water level and stage-discharge relationships at the ends of the irrigation canals. TheDRF was estimated using measured infiltration amount from paddy fields of the irrigated district. A combined monitoring and modeling method was usedto estimate the RFD by subtracting surface runoff from surface drainage. The paddy block irrigated from the Idong reservoir was selected to study theirrigation return flow components. The results showed that daily agricultural water supply (AWS), the RFI, and the RFD were 27.4 mm day-1, 4.9 mmday-1, and 19.8 mm day-1, respectively in May, which were greater than other months (p<0.05). The return flow ratio of the RFI and the RFD were thegreatest in July (34.6%) and May (72.3%), respectively. The daily AWS was closely correlated with the RFD (correlation coefficients of 0.76~0.86) inexcept for July with, while correlation coefficient with the RFI were 0.56 and 0.42 in June and July, respectively (p<0.01). The total irrigation return flowwas 1,965 mm in 2011, and 1,588 mm in 2012, resulting in total return flow ratio of 84.6% and 79.1%, respectively. This results indicate that substantialamounts of agricultural water were returned to streams as irrigation return flow. Thus, irrigation return flow should be fully considered into theagricultural water resources planning in Korea.
Abstract
The objective of this study was to investigate characteristics of irrigation return flow from paddy block in a reservoir irrigated district during growingseasons. The irrigation return flow was divided into three parts, quick return flow from irrigation canal (RFI), quick return flow from drainage canal(RFD), and delayed return flow (DRF). The RFI was calculated from water level and stage-discharge relationships at the ends of the irrigation canals. TheDRF was estimated using measured infiltration amount from paddy fields of the irrigated district. A combined monitoring and modeling method was usedto estimate the RFD by subtracting surface runoff from surface drainage. The paddy block irrigated from the Idong reservoir was selected to study theirrigation return flow components. The results showed that daily agricultural water supply (AWS), the RFI, and the RFD were 27.4 mm day-1, 4.9 mmday-1, and 19.8 mm day-1, respectively in May, which were greater than other months (p<0.05). The return flow ratio of the RFI and the RFD were thegreatest in July (34.6%) and May (72.3%), respectively. The daily AWS was closely correlated with the RFD (correlation coefficients of 0.76~0.86) inexcept for July with, while correlation coefficient with the RFI were 0.56 and 0.42 in June and July, respectively (p<0.01). The total irrigation return flowwas 1,965 mm in 2011, and 1,588 mm in 2012, resulting in total return flow ratio of 84.6% and 79.1%, respectively. This results indicate that substantialamounts of agricultural water were returned to streams as irrigation return flow. Thus, irrigation return flow should be fully considered into theagricultural water resources planning in Korea.
참고문헌 (31)
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