Author(s): Ravi Kumar Mishra; Bandita Barman; Tinesh Pathania

Linked Author(s):

Keywords: Numerical modeling; River morphology; Sand mining; Sediment transport; TELEMAC-3D-GAI

Abstract: The extraction of sand and gravel from rivers around the world has become more prevalent due to the rapid urbanization and infrastructure development over the years. The literature suggests that unregulated sediment mining can adversely affect river morphology, ecology, and nearby hydraulic structures. In this study, we used the coupled TELEMAC-3D-GAIA model to examine the complex flow and morphological changes at a channel confluence with a sediment mining pit. The presence of the pit significantly influenced the regions of flow separation and maximum velocity in the post-confluence channel. In addition, the structure of the secondary flows near the confluence zone was altered due to the presence of the excavated pit. It was observed that the pit located downstream of the confluence also influenced the morphological evolution. The erosion of the channel bed was more significant, and the extent of the lowering of the bed reached further downstream in the scenario with an excavated pit. Thus, the intricate hydro-morphodynamic attributes at the confluence were further complicated by the existence of a sediment mining pit.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P1702-cd

Year: 2025