가능최대홍수량 산정과 적용에 의한 농업용저수지의 수문학적 안정성
Analysis on Hydrologic Stability of Agricultural Reservoir According to Estimation and Application of Probable Maximum Flood
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초록
대상저수지로 선정된 충청북도 보은군 속리산면에 위치한 비룡저수지 및 충청북도 진천군 초평면에 위치한 원남저수지의 가능최대강수량을 농업용저수지치수관리시스템을 사용하여 재산정하고, 산정된 가능최대강수량에 의해 변화되는 수위별 여수로 방류량을 계산하여 대상저수지의 홍수위를 추적함으로서 저수지의 수문학적 안정성을 검토하였다. 비룡저수지와 원남저수지의 수문학적 안정성을 검토한 결과, 두 저수지 모두에서 최고수위가 저수지를 월류하지는 않으나 여유고가 각각 1.2m와 1.5m부족하여 수문학적 안정성을 확보하지 못하는 것으로 분석되었다. 두개 저수지의 수문학적 안정성 확보를 위해 여수로 확장 등과 같은 구조적 대책이나 홍수기 저수지 운영룰과 같은 비구조적 대책이 필요한 것으로 분석되었다. 저수지의 설계기준 변경을 적용하여 산정된 비룡저수지 및 원남저수지의 가능최대홍수량은 과거의 저수지 설계기준에 의해 산정된 200년 빈도 확률홍수량에 비해 약 150~285% 정도의 높은 첨두홍수량을 나타내었다.
Abstract
The probable maximum precipitation(PMP) at Biryong reservoir and Wonnam reservoir, both selected as the target reservoirs, was recalculated using the flood control system for the reservoir. The hydrological stability of the reservoirs was investigated by tracking the flood water level of the target reservoirs using the spillway discharge based on water level changed by the calculated PMP. Results of the investigation on the hydrological stability of the Biryong reservoir and Wonnam reservoir showed that the maximum water level did not overflow the full reservoir level in both reservoirs. However, hydrological stability could not be secured because the allowable height fell short by 1.2m and 1.5m, respectively. The analysis also found that structural measures such as spillway expansion or non-structural measures, like reservoir operating rules for the flood season, are needed to ensure the hydrological stability of the two reservoirs. The probable maximum flood(PMF) at the Biryong reservoir and Wonnam reservoir calculated by applying the change in reservoir design criteria exhibited a higher peak flood of about 150-285%, compared to the 200-year frequency probability flood calculated using the reservoir design standards of the past.
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