아산호 용수공급용량 유지를 위한 적정 준설량 산정
Estimation of the Optimal Dredge Amountto Maintain the Water Supply Capacity on Asan-Lake
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초록
본 연구에서는 아산호의 용수 공급용량 유지를 위한 적정 준설량 산정을 위해 수문환경의 변화를 분석하였다. 토지이용 변화에 따른 유사유입과 같은 수문환경의 변화가 유역의 유출특성에 어떤 식으로 영향을 주는지 살펴보기 위해서 DIROM을 이용하여 아산호의 물수지 분석을 실시하였고, 원격탐사 기법으로 토지이용 변화를 살펴보았으며, 이를 바탕으로 유입유사량과 장래 퇴적분포를 추정하였다. 모의된 결과로부터 연도별 필요저수량을 구하여 확률빈도분석을 실시하였고, 빈도분석 결과를 바탕으로 재현기간별 소요내용적을 작성하여 농업용수 계획 설계기준인 10년 빈도 내한 능력에 따른 적정 계획 준설량을 평가·산정하였다. 평가 결과 장래 계획 준설량은 단기적인 측면과 장기적인 측면에서 함께 고려해야 할 것으로 판단된다. 일반적으로 장기적은 측면을 고려할 때 적정 계획 준설량은 제 3안의 연평균 780 103 m3 정도가 적합한 것으로 나타났다. 이 양은 향후 50년간의 퇴적환경변화를 감안한 평균적인 추세이며, 본 연구에서 검토한 제 1안, 제 2안의 경우도 한정적인 기간에는 타당성이 있는 것으로 판단된다.
Abstract
This study analyze the hydrologic conditions and the effects of selected runoff characteristics as an attempt to estimate the optimal dredge amount for Asan Lake in Korea.The runoff feature was calculated by utilizing the water balance simulation from DIROM (Daily Irrigation Reservoir Operation Model), which allowed changes in landuse to be quantified using remote sensing for 14 years. The distribution of prospective sediment deposits was been tallied based on the changes in landuse, and quantity of incoming sediment estimated. From these findings, we were then able to simulate the fluctuation of water level, gauging the pumping days not already in use, to determine the frequency of the distribution for around the requirement annual water storage and the changing water level. The optimal dredge amount was calculated on the basis of the distribution of frequency, taking into account the design criteria for agricultural water with the 10-year frequency of resistant capacity.
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