The Effect of Hydraulic Characteristics on Algal Bloom in an Artificial Seawater Canal: A Case Study in Songdo City, South Korea

Water

Seung Oh Lee³  Sooyoung Kim³  Moonil Kim²  Kyoung Jae Lim¹ 

[1]Department of Regional Infrastructural Engineering, Kangwon National University, Chuncheon 200-701, Korea

[2] E-Mail:

[3]Department of Civil and Environmental Engineering, Hanyang University, Ansan 426-791, Korea

[4] E-Mail:

[5]Department of Urban & Civil Engineering, Hongik University, 72-1 Sangsu-dong Mapo-gu, Seoul 121-791, Korea

[6] E-Mails:

关键词: artificial seawater channel;    algal bloom;    nutrient (T-N and T-P);    hydraulic characteristics;    vorticity;    FLOW-3D;   

DOI  :  10.3390/w6020399

来源: mdpi

【 摘 要 】

Algal blooms have threatened the environmental functions of artificial seawater canals. Generally, water quality in a canal is managed by periodically circulating water from the sea into the canal. However, hydraulic characteristics from the canal design can interrupt the removal of algal blooms by water circulations in the canal. Accordingly, this study analyzed the effect of the hydraulic characteristics on algal blooms in an artificial seawater channel in Central Park, New Songdo City, Korea using a 3-D hydrodynamic model. Nutrients and velocity in stagnant areas in the canal were spatio-temporally measured. Algal bloom locations based on field monitoring mainly corresponded with areas of stagnant water and high vorticity in the z-direction, as determined by the numerical simulations. These results support that high vorticity interrupts the transfer water to the outer area when the canal water is in a stagnant condition. A high value of z-direction vorticity resulted in increased nutrient (total nitrogen (T-N) and total phosphorus (T-P)) availability, and sequentially increases the probability of algal bloom events. In this regard, this study will give a contribution to prevention of algal blooms in the artificial seawater canal.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.