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- W3137977461 abstract "Abstract The Ganges‐Brahmaputra‐Meghna (GBM) delta plain within Bangladesh is one of the most vulnerable to relative sea level rise (RSLR) in the world especially under current anthropogenically modified (i.e., embanked) conditions. Tidal river management (TRM) as practiced in coastal regions of Bangladesh may provide an opportunity to combat RSLR by raising the land level through controlled sedimentation inside beels (depression within embanked polders) with re‐opening of polders. To date, TRM has been applied to tide‐dominated coastal regions, but the potential applicability of TRM for the beels within the polders of river‐dominated and mixed flow (MF) regimes remains to be assessed. We apply a calibrated 2D numerical hydromorphodynamic model to quantify sediment deposition in a beel flooded through breaching of the polder dike under conditions of river‐dominated, tide‐dominated and MF regimes for different seasons and applying different regulation schemes for the flow into the beel. Simulation results show considerable seasonality in sediment deposition with largest deposition during the monsoon season. The potential of controlled flooding is highest in the tide‐dominated region, where sediment accumulation can be up to 28 times higher than in the river‐dominated region. Regulating flow into a beel increases trapping efficiency, but results in slightly lower total deposition than without regulation. We conclude that re‐establishing flooding of the beel within the polder without regulating the flow into the beel through breaching of the polder dike is a promising strategy for the mixed and tide‐dominated flow regions in the delta as the sediment accumulation can raise the land surface at a higher rate than RSLR and effective SLR (ESLR). In the more upstream river‐dominated section of the delta, accumulation rates would be much lower, but the pressure of sea level rise on these areas is lower as well. Owing to the abundant availability of sediment, application of controlled flooding like TRM therefore provides an opportunity to counteract the impact of RSLR and ESLR by means of land raising, particularly along the tidal river reaches in the GBM delta." @default.
- W3137977461 created "2021-03-29" @default.
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- W3137977461 date "2021-04-01" @default.
- W3137977461 modified "2023-10-16" @default.
- W3137977461 title "Spatial and seasonal variability of sediment accumulation potential through controlled flooding of the beels located in the polders of the <scp>Ganges‐Brahmaputra‐Meghna</scp> delta of Southwest Bangladesh" @default.
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- W3137977461 doi "https://doi.org/10.1002/hyp.14119" @default.
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