Effects of Width Ratio and Offtake Angle on the Morphological Characteristics of an Offtake Channel

River channel bifurcations play a crucial role in shaping fluvial systems, yet their morphological behavior remains a significant challenge in water resource engineering.  The present study is an attempt to investigate the effects of different off-taking angles (15, 30, 45, 60, 75, and 90 degrees) and width ratios (0.2, 0.4, 0.6, and 0.8) on the morphological behavior of offtake channels through a numerical modeling approach using SRH-2D. To comprehensively understand the morphological behavior of the offtake channel, the discharge ratio and the size of the flow separation area were also analyzed.  The result shows that the discharge ratio increases with an increase of offtake angle up to 75 degrees and the length of the separation zone decreases with the increase of offtake angle for any width ratio. The morphological analysis showed the presence of deposition dominance along the offtake channel for all offtake angle and width ratios. Erosion-deposition patterns varied along different sections of the offtake channel depending on the width ratio. These findings significantly contribute to the understanding of morphological characteristics in offtake channels of river channel bifurcations.