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J Korean Soc Environ Eng > Volume 37(10); 2015 > Article
J Korean Soc Environ Eng 2015;37(10): 563-572. doi: https://doi.org/10.4491/KSEE.2015.37.10.563
영산강 다기능보 운영에 따른 플러싱 및 조류 배제 효과 모델링
정선아1, 이혜숙1, 황현식2, 김호준1
1한국수자원공사 K-water연구원
2한국수자원공사 물관리센터
Modeling the Flushing Effect of Multi-purpose Weir Operation on Algae Removal in Yeongsan River
Sun-a Chong1, Hye-suk Yi1, Hyun-sik Hwang2, Ho-joon Kim1
1K-water Institute, K-water
2Water Resources Operations Center, K-water
Corresponding author  Sun-a Chong ,Tel: 042-870-7455, Fax: 042-860-0369, Email: jsa@kwater.or.kr
Received: September 25, 2015;  Revised: October 22, 2015;  Accepted: October 28, 2015.  Published online: October 31, 2015.
ABSTRACT
The purpose of this study was to model the effect of flushing discharge on algae removal by multi-purpose weir operation in Yeongsan River (Seungchon Weir) using a 3-dimensional (3D) model. The chlorophyceae Eudorina sp. formed bloom in May 2013. Flushing discharge was conducted in two different ways for algal bloom reduction. To elucidate the spatial variability, a high-resolution 3D model, ELCOM-CAEDYM, was used to simulate the spatial variations of water quality and chl-a over a month. The results showed that ELCOM-CAEDYM could reproduce highly spatially resolved field data at low cost, and showed very good performance in simulating the pattern of algal bloom occurrence. The effect of each flushing discharge operation was analyzed with the results of modeling. The results of case 1, flushing discharge using an open movable weir, showed that the algal bloom between the Seochang Bridge and the Hwangryong River junction is rapidly flushed after operating the movable weir, but the residual algae remained in the weir pool as the discharge decreased. However, the results of case 2, fixed weir overflow with a small hydropower stop, showed that most of the algae was removed after flushing discharge and the effect of algae removal was much bigger than that in case 1, as per modeling results and observed data.
Key Words: Flushing Discharge, Multi-purpose Weir, Algae Removal, Eudorina sp., ELCOM-CAEDYM
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