Author(s): Siti Nurain Che Mohd Azmi; Saerahany Legori Ibrahim; Izihan Ibrahim; Dani Irwan Masbah
Linked Author(s): Saerahany Legori Ibrahim, Izihan Ibrahim
Keywords: Hydrodynamic Analysis Kasa Low Weir Crump Weir Scouring FLOW-3D Sungai Kelantan
Abstract: Scour around low weir structures is a critical issue that impacts riverbed stability, structural integrity, and the ecological balance of river systems. This study investigates the scour patterns and hydrodynamic characteristics around the Kasa Low Weir in Pasir Mas, Kelantan, Malaysia. The focus is on comparing the original weir design with a proposed solution, the Crump weir, using FLOW-3D, a computational fluid dynamics (CFD) tool. The analysis assesses the interaction between hydraulic flow, sediment transport, and scour formation under various flood scenarios. This research addresses concerns from the Department of Irrigation and Drainage Malaysia (JPS) after the collapse of 130 meters of hydraulic tilting gates at the Kasa Low Weir two years post-construction. JPS proposes replacing the collapsed structure with a Crump weir, known for its simple design and ability to reduce flow turbulence, thus preventing scour. The study simulates and compares the hydrodynamic performance of both weirs design, focusing on maximum surface velocity and velocity at scour depth. Results indicate that the Crump weir has the potential to reduce scour depth and improve sediment distribution. Field data from the Kasa site was used for model calibration, ensuring accurate findings. This research provides valuable insights into sustainable river structure management and the application of FLOW-3D for optimizing hydraulic designs.
Year: 2025