Summary
Summary Bangladesh Coastal Flooding and Cyclone Sidr
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Bangladesh Coastal case study looking at the impacts of the floods and why Bangladesh is at risk to sea level rise. Cyclone Sidr's affects are also key.
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Some examples from this set of practice questions
1.
What percentage of People live less than 10m below sea level in Bangladesh
Answer: 46%
2.
3 main rivers with flood plains in Bangladesh
Answer: Ganges Meghna Brahmupuha
3.
What does Himalayan Snow-melt cause
Answer: Flooding, also caused by Monsoon rain
4.
Reasons for Flooding
Answer: Subsidence and Removing Vegetation
5.
Subsidence in Bangladesh
Answer: Some estuarine islands sank by 1.5m in 50 years. This is due to isostatic readjustment. The islands used to be forested but now grow rice. In 1960s embankments were built to protect tidal storm surges but it prevented natural sediment distribution and increased flood risk
6.
Removal of Vegetation causing flooding
Answer: Mangrove forests are complex ecosystems that collect sediment. They provide protection against extreme weather as they absorb energy. But 71% of Bangladeshs mangroves are retreating 200m a year. And now used for shrimp farms
7.
Human Factors causing flooding
Answer: - High and rapidly growing coastal population - Flood plains being urbanised - Global Warming - Mangrove removal
8.
Key facts Cyclone Sidr
Answer: Occurred on 15 November 2007 223km/h winds 6m high waves Category 4 storm
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