Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Hydrograph separation for two consecutive rainfall events using tracers($\delta^{18}$O & Cl)

추적자($\delta^{18}$O & Cl)를 이용한 두 연속강우의 유출수문곡선 분리 연구

Cho, Sung-Hyeon;Ha, Kyoo-Chul;Kim, Tae-Hee;Cheon, Su-Hyun;Song, Moo-Young
조성현;하규철;김태희;전수현;송무영

  • Published : 2007.06.30

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Abstract

This study aims to separate new-water (rainfall) and baseflow from a hydrograph of two consecutiverainfall events and to asess their relative contributions. During no excess rainfall period, the chanel discharge is regarded as being composed entirely of groundwater. The tracers in the stream water are also assumed as being in equilibrium with those in the groundwater. After two rainfall events, the stream discharge was mixed with the baseflow and two rainfal components. A new mixing model was developed for the separation and was compared with two-component model. The separations were performed using environmental tracers (δ18O, Cl) at a small catchment in Daejeon, Korea. The new model indicate the effect of the overlay and lag of new-water components on a hydrograph of two consecutive rainfal events. The separation results are more or less diferent from the tracers and the application models, which is caused by the property of each tracer and the limitation of the binary model.

본 연구의 목적은 연속적인 두 번의 강우에 대한 유출수문곡선으로부터 기저유출과 강우성분을 분리한 것이다. 유효강우가 없는 기간동안 하천수위는 기저유출에 의해서만 유지되고 하천의 추적자의 조성이나 농도 또한 기저유출과 같은 것으로 가정되었다. 수문곡선분리를 위한 환경추적자는 δ18O와 Cl-를 이용하였다. 새로운 혼합모델을 제시하여 연속적인 복합강우와 기저유출 성분을 분리하고 각 유출성분들의 비율을 산정하였다. 기저유출률은 각 추적자마다 다르게 나타났는데 각 추적자의 특성과 2분법적인 모델의 한계에서 기인되었다. 그러나 새로운 모델은 복합강우에 대하여 각 유출성분들이 중첩되거나 지연되는 효과를 현실성 있게 표현했다.

Keywords

References

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