Bangladesh Flashcards

1
Q

Storm surges

A

40% of all recorded storm surges happen in Bangladesh

Most at risk from tropical cyclone storm surges

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2
Q

Height

A

Low lying river delta (<9m)

Majority is <3m above SL

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3
Q

Sediment

A

Coastline is unconsolidated delta sediment

Dynamic + more erosion

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4
Q

Rivers

A

Ganges + Brahmaputra

3rd largest discharge (30770m3/s) + largest suspended sediment load (1.84bil tonnes/yr)

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5
Q

Mangroves

A

Deforested mangroves

Stabilised swamps + dissipated wave energy

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6
Q

Coastal shape

A

Triangular shape acts as funnel

Intense cyclone rainfall - more flooding — leads to disease (cholera/malaria)

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7
Q

Tropical cyclones

A

Creates LP - less weight of air so SLR (storm surge)

Wind speed reaches 260kmh - high energy waves (more height)

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8
Q

SLR

A

28-98cm SLR within the century - 65cm by 2080

40% farmland lost

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9
Q

Subsidence

A

Bengal Delta subsiding 8-18mm/yr (isostatic readjustment)

Himalayas uplifting + compaction of buried sediment + humans (urbanisation + dredging)

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10
Q

Cyclone Sidr, 2007

A

3m storm surge + 260kmh winds

15000 deaths + US$1.7bil damage + 3mil houses lost + 2mil lost income source

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11
Q

Hypothetical

A

If 40cm SLR - 11% of Bangladesh’s coastal land submerged - 7-10mil refugees

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