Global Warming and the Padma
Bridge in Bangladesh
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specialists
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The Indian Subcontinrent
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Ganga – Brahmaputra – Meghna Rivers
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Design Parameters
Bridge design flows
1. Flood discharge - 100 yr flood
2. Water level – 100 yr level
3. Scour depths (elevations) = 100 yr scour
Global warming
1.
2.
3.
4.
5.
Rainfall - + 25% by 2100
Water level rise ?
Sea level rise – 0.5 to 1.0 m
Cyclones
Delta subsidence
water resource specialists
Uttar Pradesh, Bihar, West Bengal, Assam and Bangladesh
Bangladesh floods due to rainfall in Assam. Ganga does not influence flood levels
significantly.
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Flood Affected Area - 1988
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Bridge Pier Scour
Hydraulic Model
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Bridge Pier Scour
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Annual Rainfall Change by 2100 (IPCC)
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Northeast Regional Project – Mean Annual Rainfall
Range: 8000 mm/yr to 2000 mm/yr
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Sea-Level Rise in the Twentieth Century
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Vanishing Glaciers Biggest Threat to World Food Supply
Crops likely hit hardest by flooding, drought, pollution and will cause skyrocketing prices
by Lester R. Brown
According to the World Bank, it would take only a three-foot rise in sea leel to cover half the rice
fields in Bangladesh, a country of nearly 160 million people.
Washington Post
Leter R. Brown is president of the Earth Policy Intitute an the author of “Plan B4.0: Mobilizing to
Save Civilization.”
World News Updated 24/7 at Vancoversun.com/world
water resource specialists
Projected Areas of Flooding as a Result of Sea-level
Change in Bangladesh
Two scenarios (low=1m and high=3 m)
(modified after Broadus et al./ 1986
Broadus, J., Milliman, J., Edwards, S., Aubrey,
D. and Gale, F., 1986, Rising sea level and
damming of rivers: possible effects in Egypt
and Bangladesh. In J.G. Titus (ed.), Effects of
changes in stratospheric ozone and global
climate. Washington, DC: United nations
Environment Program/U.S. Environmental
Protection Agency, 165-89.
water resource specialists
Design Parameters
Bridge design flows
1. Flood discharge - 100 yr flood
2. Water level – 100 yr level
3. Scour depths (elevations) = 100 yr scour
Global warming
1.
2.
3.
4.
5.
Rainfall - + 25% by 2100
Water level rise ?
Sea level rise – 0.5 to 1.0 m
Cyclones
Delta subsidence
water resource specialists
Global Warning, The Last Chance for Change
water resource specialists