Abstract

The Ganges-Brahmaputra-Meghna delta is one ofthe most dynamic tide dominated deltas in the world, adynamism forced in part by the huge flows and sedimentsgenerated in the catchments of the GBM basins. In this study,we apply 1D and 2D dynamic models (HEC RAS and Delft 3D)to analyze the volumetric flow distribution in these estuarinesystems. The flow distribution parameters are then used asproxy variables to study the sediment transport mechanism inthe region. Flow distribution patterns show that freshwaterinput and storage are much higher than the saltwater input andstorage. Considering freshwater contribution, eastern estuarinesystem plays important role during monsoon whereas, duringdry season it is central estuarine system. Western estuarinesystem mainly contributes to store saline water. The LowerMeghna estuary is the main flow and sediment carrying channelin the region. Clock-wise estuarine circulation makes thesediments to re-enter from the sea into central estuarine system,forms flocks in the saline environment, and cause sedimentation.