water resource specialists global warming and the padma bridge in bangladesh water resource...

water resource specialists

Global Warming and the Padma Bridge in Bangladesh

water resource specialists

water resource specialists

The Indian Subcontinrent

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Ganga – Brahmaputra – Meghna Rivers

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Bridge design flows1. Flood discharge - 100 yr flood 2. Water level – 100 yr level3. Scour depths (elevations) = 100 yr scour

Global warming1. Rainfall - + 25% by 21002. Water level rise ?3. Sea level rise – 0.5 to 1.0 m4. Cyclones5. Delta subsidence

Design Parameters

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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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water resource specialists

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 pricesby 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 PostLeter 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

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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

Bridge design flows1. Flood discharge - 100 yr flood 2. Water level – 100 yr level3. Scour depths (elevations) = 100 yr scour

Global warming1. Rainfall - + 25% by 21002. Water level rise ?3. Sea level rise – 0.5 to 1.0 m4. Cyclones5. Delta subsidence

Design Parameters

water resource specialists

Global Warning, The Last Chance for Change