Author(s): Mukesh Kumar Yadav; Ngangbam Romeji
Linked Author(s): Ngangbam Romeji Singh
Keywords: Sediment deposition and erosion; Quasi-unsteady; NSE; Channel invert; Replenishment
Abstract: Thoubal River, a significant tributary of the Imphal or Manipur River, holds prominence within the Manipur River Basin. This study is intended to carry out a sediment transport study in the Thoubal River reach where unregulated sand–gravel mining taking place in large extents has drastically altered the hydraulic regime of the river system and its floodplains. To mitigate this impact, it is essential to estimate sediment deposition and erosion depths at various locations, ensuring sustainable sand–gravel mining without disrupting the river’s fluvial system. In this particular study, Hydrologic Engineering Centre-River Analysis System (HEC-RAS) version 6.1 is used. Engelund-Hansen transport function with fall velocity of Toffaleti is used to determine the total sedimentation load of the river. From the analysis of the model, total sediment erosion and deposition were obtained at different cross sections in the study reach. The model is calibrated with the observed data and a statistical analysis is done. The result shows that the model is performing well and can describe the sediment discharge movement as well as can estimate the depth of erosion and deposition at different cross sections in the study reach.
Year: 2024