Analysis of Water Quality Improvement Effect of Controlled River by Multi-Functional Weir Operation

In this study, the water quality change in a stagnant controlled river containing hard management structures due to pulsed flow was simulated. The Environmental Fluid Dynamics Code (EFDC) model used for simulation, and improvement effect caused by simulated multiple scenarios. Based on Case 1, which 274.2–291.8 CMS discharged five hours, other scenarios, gate opened 0.5 m 1.0 while discharge time doubled, were On comparing level results with observed data, relatively positive result of R2 = 0.82 obtained. simulation showed that concentrations Chl-a, COD, T-P were, respectively, approximately 7.7%, 4.5%, 4.0% higher 2 than 24 h after start discharge. Cases 3 4, hand, exhibited decreased These confirm leads different effects depending amount duration. Furthermore, recorded at close 0% 72 all As appears within almost disappears scenario, physical solution problem is required.