Author(s): Zahra Senobari; Hanifeh Imanian; Morteza Kolahdoozan; Masoumeh Hashempour
Linked Author(s):
Keywords: Sediment transport; Incipient motion; Numerical modeling; Morphological changes; Delft3D
Abstract: Sediment transport, which leads to erosion and deposition, significantly affects aquatic environment morphology. The critical factor in this process is the precise definition of the sediment initiation of motion. Several initiations of motion criteria were introduced in the literature, each related to the flow's specific state. This study investigates the importance of incipient motion in sediment transport by numerically modeling of cross flow at trench experiment using Delft3D incorporating the Shields criterion for incipient motion. The results were validated against experimental data, showing the root mean square errors (RMSE) of 0.0096 and 0.0119 for bed elevation at 7.5 and 15 hours, respectively. Additionally, the coefficients of determination (R2) for streamwise velocity and sediment concentration profiles, averaged 0.934 and 0.923, respectively. These findings demonstrate the model's accuracy in replicating sediment transport behavior in crosswise trenches.
Year: 2024