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Cyclone-induced floods are a significant natural hazard affecting Bangladesh and coastal India. These floods result from the interaction of atmospheric and physical geographical factors that influence the region’s vulnerability. Understanding these factors helps in assessing risks and planning mitigation strategies.
Geographical Features of the Region
The Bay of Bengal’s proximity to Bangladesh and India’s eastern coast plays a crucial role in cyclone formation. The region’s low-lying deltaic landscape, especially the Ganges-Brahmaputra-Meghna delta, is highly susceptible to flooding. The flat terrain allows water from storm surges and heavy rainfall to spread quickly across large areas.
Factors Contributing to Flooding
Several physical geographical factors contribute to the severity of floods during cyclones:
- Low elevation: Much of the land is below 10 meters above sea level, increasing flood risk.
- River systems: The Ganges, Brahmaputra, and Meghna rivers carry large volumes of water, which can overflow during heavy rains and storm surges.
- Coastal morphology: The gently sloping coastline facilitates the inland movement of storm surges.
- Wetland areas: These act as natural buffers but can be overwhelmed during intense cyclones.
Impact of Cyclone Path and Intensity
The trajectory and strength of cyclones influence flood extent. Cyclones that make landfall at low angles and with high intensity generate larger storm surges. The combination of high wind speeds and low atmospheric pressure causes sea levels to rise significantly, inundating coastal areas.
In addition, the timing of cyclones during the monsoon season can exacerbate flooding, as the region already experiences heavy rainfall, reducing the land’s capacity to absorb water.