Climatic Impacts on the Fluvial and Tidal Inundation Patterns in the Ganges-Brahmaputra-Meghna Delta

The Ganges-Brahmaputra-Meghna (GBM) delta is the largest and one of the most significant tide dominated deltas of the world that provides rich and diverse ecosystem with low-lying coastal plain. This delta is perceived to be at great risk of increased flooding due to climatic impacts and submergence from sea-level rise. In this study, fluvial and tidal inundation patterns resulting from temperature and sea level rise is evaluated by applying a numerical model (Delft3D Flow). Boundaries of temperature and sea level rise are provided by a hydrological (INCA) and an ocean model (GCOMS) respectively. To study the impacts, two time horizons, namely mid and end century are considered. This study has mainly focused on inundation area and mean flood depth. Results show that in this region, fluvio-tidal floodings are characteristically different in different climatic and sea level rise scenarios.