Bangladesh (Local factors increasing flood risk (Storm surges often meet…
Local factors increasing flood risk
so less interception
Intense rainfall fromtropical cyclones causes
often meet outflowing river discharge from Ganges and Brahamputa rivers.
river flooding and coastal flooding combined make it worse.
Concrete roads and foundations that are
so water runs off it
*3 gorges dam
up the Ganges river
stops sediment from reaching
the delta therefore sediment cell is being starved and making coast vulnerable to erosion of floods
storm surge events
deforestation of coastal mangrove forests has removed vegetation.
this once stabilized coastal swamps and dissipated wave energy during tropical storms
Triangular shape of bay on Bengal concentrates a cyclone storm surge as it moves north
Increases height when it makes landfall
Bhola cyclone 1970
Killed 500,000 people
storm serge was 10 metres high
$490 million of damage
Cyclone Sidr november 2007
damage to housing, roads, bridges.
winds up to 420 km per hour, with tidal waves up to 6 meters.
breaching coastal and river banks and all low lying areas
electricity knocked out
people left without power can't cook
business not able to open - loss of money
by debris and saline water
sanitation infrastructure destroyed
people becoming sick and easy spread of disease therefore
increasing death toll.
1 million house holds seriously effected
issues DUE to sea level rise
much of country is very low lying
only 1-3 M above sea level
very vulnerable to water coming inland.
coastline made up of unconsolidated delta sediment
Susceptable to erosion
more of country will be washed away faster
Has the most densely populated coastline on eaarth
Sea levels rise will force people to move inwards and will leave people homeless (environmental refugees)
farmers and fishermen will lose there trade as crops flood
Fish become dangerous
increase salt content in soil will decrease rice production
will struggle as it is base on agriculture
families have no money for food -worsen food situation
Impacts of future climate change on frequency of storms and magnitude + sea level rise
cyclones and storm surges
become more frequent NO time to recover in between
larger magnitude of storms causing more flooding
productive land will be lost
in southern Bangladesh due a
65cm sea level rise by 2080
temperature expected to rise
1.4 -5.8 degrees by 2100
Thermal expansion of water increasing sea levels more
Ice caps melting which also adds to the volume of water rising sea levels faster