Hydrodynamic Analysis of Channel Shape and Flow Discharge Variations for Flood Mitigation

This study aims to analyze the hydrodynamics of the Right Main Channel of Baliase using the Nays2DH–International River Interface Cooperative (iRIC) computational simulation and evaluate the changes in the flow velocity patterns and Froude numbers (Fr) based on the revised channel design. The novelty of this research lies in utilizing Nays2DH within the iRIC platform to simulate the detailed hydrodynamic behavior, thereby providing a new understanding of how the changes in the channel design affect the flow dynamics in real-world scenarios. The study adopts a computational simulation approach, utilizing iRIC software to replicate the field conditions and provide accurate hydraulic representations. The research methodology involves model development, running simulations, and analyzing results. The findings indicate that the Nays2DH simulation accurately represents the hydrodynamic conditions of the Right Main Channel, both before and after the channel modifications. The key results show that the Fr in Model A ranges from 0.224 to 0.236 (subcritical flow), while in Model B, after the modifications, it ranges from 0.45 to 0.7, indicating notable improvements in the flow management. However, the upstream section experiences supercritical flow (Fr > 2), emphasizing the need for structural reinforcement. Based on these findings, the study proposes that further research is needed to examine the effects of the dynamic flow conditions under different discharge scenarios and climate factors, as well as the application of reinforcement strategies in critical areas to enhance the long-term channel stability. This research contributes to the development of more effective flood mitigation strategies through hydrodynamic modeling and channel design optimization.