• 대한토목학회논문집
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• 제39권6호
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• pp.743-750
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• 2019

하천을 수원으로 하는 상수도 시설은 강수량 및 하천 유량과 같은 모니터링 설비가 없는 곳이 대부분이며, 갈수기 등 하천 유량 감소기에도 취수량 조절과 같은 가뭄대응을 위한 판단 기준이 없어 사전 대응이 곤란한 실정이다. 또한, 실제 가뭄 업무를 일선에서 처리하는 지자체 공무원 등이 지금까지 제시된 가뭄지수(SPI, PDSI 등) 및 확산 모델 등을 사전 대응에 활용하기에는 한계가 있는 것으로 나타났다. 이에 따라 본 연구에서는 장기유출모형(SWAT)의 매개변수 검·보정을 통해 장기간의 일단위 유출량을 추정하였으며, 감수곡선식을 도출하였다. 또한, 일단위 취수량과 감수곡선식의 관계분석을 통해 취수가능일수를 정량적으로 산정하였으며, 이를 용수공급 네트워크에 대입하여 읍면동 단위 적용 가능 범위를 제시하였다.

• 한국농공학회논문집
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• 제62권2호
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• pp.53-62
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• 2020

The purpose of this study is to estimate the channel water loss of agricultural water supply in the command areas belong to Yechon irrigation channel of Gyeongcheon reservoir located Mungyeong-si, which area experienced a severe drought in 2015. The channel water loss was estimated by comparison of the irrigation water requirements (IWR) and agricultural water supply of the field data from 2012 to 2015. Further analysis was conducted to define the conveyance loss estimated based on the leakage holes and illegal pumping spots investigated through the field survey, and the distribution loss obtained by subtracting conveyance loss from the channel water loss. The annual rainfall decreased gradually, but the contribution of effective rainfall, available rain water to crop, increased to IWR during the study period. These phenomena resulted in the increase of agricultural water supply, and hence made greater the channel water loss simultaneously. The average channel water losses estimated as 36.8 % with 7.1 % of the conveyance loss and 29.7 % of distribution loss respectively. The distribution loss seems to be related to total number of rainy days, and irrigation schedules, while the conveyance loss was caused by irrigation channel aging conditions and illegal intake problems. In order to achieve sustainable agricultural water resources, the channel water loss needs to be reduced through the restoration of aged irrigation facilities and effective water managements in the fields.