Shoaib, M.; Iqbal, M.M.; Khan, R., and Lee, J.L., 2019. An analytical study for eutrophication management of arawaterway, Korea, by developing a flow model. In: Lee, J.L.; Yoon, J.-S.; Cho, W.C.; Muin, M., and Lee, J. (eds.), The 3rd International Water Safety Symposium. Journal of Coastal Research, Special Issue No. 91, pp. 226-230. Coconut Creek (Florida), ISSN 0749-0208.

The first inland artificial flow canal, Arawaterway, located at the lower part of the Han River, Korea, has been experiencing an excessive concentration of chlorophyll-a, lately. This study aims to develop an efficient plan to reduce the concentration of chlorophyll-a in the waterway. An analytical model was applied and calibrated with the data of the year 2016 to find the influence of the detention time on the chlorophyll-a concentration. Statistical analysis was applied to verify the results of the analytical model. A numerical method, Runge-Kutta was applied to compare the results of the analytical solution. A flow model was developed to find the optimum flow rate from the Han river to the Arawaterway. Based on the elevation of West Sea and the Han River the elevation of Arawaterway was calculated. The results revealed that under the optimum flow conditions, the detention time could be decreased by 61%. The result produced by the flow model was applied on the analytical model and it was revealed that the mean monthly concentration of chlorophyll-a could be decreased by 28%.