Lesson 12 Flashcards
How is Bangladesh susceptible to coastal flooding?
subsidence: Isostatic readjustment is partially responsible but main reason clearance and drainage
What is Bangladesh’s physical history?
islands used to be forested but now cleared to grow rice
How have Bangladesh protected against tides and storm surges?
Embankments built
How have embankments caused problems?
prevented natural deposition of sediment which used to maintain the islands height but is n ow submerging so the island is at risk of flooding
positives of mangroves?
stabilise coastline, protect against erosion
collect nutrient rich sediment
provide a nursery for fish
Why are Bangladesh getting rid of mangroves?
25% being taken to shrimp farms
What is happening to the mangroves in Bangladesh?
retreating up-to 200 meters a year (71%)
25% being taken to shrimp farms
What Typhoon happened in the Philippines in 2013?
Typhoon Haiyan
What category was typhoon Haiyan? (2)
5 (highest) - tropical storm
category 3 disaster (highest) - WHO
Characteristics of Typhoon Hiyan? (4)
wind 315km/h
6000+ dead
28,000 injuries
7m storm surges
Effects of Typhoon Hiyan? (3)
area turned into waste land
14m effected
6/43 damaged parts repaired
How is Bangladesh susceptible to flooding? (4)
at risk from sea level rise (6-20mm)
40% of storm surges occur in Bangladesh
Increase risk of river flooding - wetter environment (disease spread),
Reduced farmland (salt contamination) Lower GDP
loss of mangroves
Which Cyclone hit Bangladesh in 2007?
Cyclone Sidr
Characteristics of Cyclone Sidr?
10m storm surge
What category was Cyclone Sidr?
4 - tropical storm (240km/h winds)