Author(s): Rahman Md Shahinur; Daisuke Harada; Shinji Egashira
Linked Author(s):
Keywords: Estuary Tidal current Suspended sediment Non-uniform sediment Sediment budget Morphological change
Abstract: This study investigates the characteristics of the non-uniform sediment transport rate in the lower Meghna River and the sediment budget in the Noakhali islands area, located in the northeastern part of the Meghna Estuary, Bangladesh. A depth-averaged 2-D model is employed to calculate the non-uniform sediment transport rate, where suspended sediment transport is dominant. A 350 km long area including the river mouth and surrounding estuary area is computed, and the results are compared with the observed tidal water levels and suspended sediment concentrations. The computational results indicate that sediment transport rates in the lower Meghna River and the sediment accumulation rate around the Noakhali islands area are primarily dominated during the monsoon season, driven by the substantial upstream river discharge carrying high concentrations of suspended sediments. These analyses also reveal the impact of the physical intervention on the flow patterns and sediment accumulation processes in the Noakhali islands area, suggesting that sediment accumulation rates significantly increase in response to the cross dams.
Year: 2025