도서지역 하천의 기저유출량 산정을 위한 유량측정방법 제안

Abstract

Abstract The water resources system of Jeju-do Island entirely depends on groundwater. This study is making a precision observation of baseflow, surface water, water shortage that might be vulnerable to climate change and drought in future. The field observat ion of baseflow discharges in Akgeuncheon stream has regularly b een made with ADCP and ADC and Flowmate every two weeks for twenty-two (22) months (July 8, 2011 to April 27, 2013). This paper represent the results of calculating discharge of a number of hydraulic structures (broad-crested weirs) with comparing and has been calculated more accurate discharges with suitability of different observation methods. The average discharge has been observed 0.851 m 3 /s, whereas the average ADC and Flowmate is 0.709 m 3 /s. Meanwhile, stream discharge has been calculated 0.709 m 3 /s through the broad-crested weir equation. The discharge has calculated with the weir equation greatly changed according to even a small change in the water level. However, it showed a similar trend to one of the observed discharge. Although, in pa st there were generating errors caused by observers’ strides, ve rtical and horizontal flow velocity distribution when the average flow velocity had been measured, non-prismatic flow, turbulent flow and others in ADC. This study comes up with the weir equation is more suitable for the characteristics of Jeju-do could be presented through an observations of baseflow discharge.