Presented ByA.H.M Rezaul Haq

Climate Change in Coastal Region of Bangladesh

An increase in global temperature will cause sea level to rise and will change the amount and pattern of precipitation, and a probable expansion of subtropical deserts. Warming is expected to be strongest in Arctic and would be associated with continuing retreat of glaciers, permafrost and sea ice.

What is Global Worming

Other likely effects of the warming include more frequent occurrence of extreme weather events including heat waves, droughts and heavy rainfall events, species extinctions due to shifting temperature regimes, and changes in crop yields. Warming and related changes will vary from region to region around the globe, with projections being more robust in some areas than others

What is Climate Change

Climate includes patterns of temperature, precipitation, humidity, wind and seasons. "Climate change" affects more than just a change in the weather, it refers to seasonal changes over a long period of time. These climate patterns play a fundamental role in shaping natural ecosystems, and the human economies and cultures that depend on them.Because so many systems are tied to climate, a change in climate can affect many related aspects of where and how people, plants and animals live, such as food production, availability and use of water, and health risks.

Draught period is extending and erratic rainfall monsoon period

compress and shifting. (we have now four season instead of six season)

Frequency and intensity of flood/flash flood is mounting.

River siltation and river erosion unusually proliferate

Salinity in the coast and in estuaries intruding toward

upstream

Tidal surge intensity and frequency is rising

Unusual rainfall and water-logged areas is increasing.

Salinization increasing

Climate change Bangladesh context

CC DriverPopulation GrowthEconomic Growth

Wetland degradation

Water diversion in upstream

Dying of River or river siltation

Mangrove/ Forest

destruction

Impa

ct

Impact

Impact

ImpactClimate

Change

Impact

INFRASTRUCTURE DEV

Environmental Backlash X Climate change = Impact

Climate

Change

Impact of CC on specific location depends

Tidal riverSaline Water

Have a link with upstreamSeasonal-saline

Fully Connected

with GBMFresh water

round the year

Non delta

Coastal ecosystem In Bangladesh and it types:

1963-Physical Situation of Sea Level and Ground Level

37 Polders = Areas covers 3 million Acres

2 million was inundated with one miter dept water that is by volume 120 million cubic miter.

River and cannels cover 15% of total areas of which 50% inside polder.

Water flow from sea River Water + WetlandArea: 2 millions AcreTidal Volume 120cubic meter

After Polder

Before Polder

Nolian Forest

Slope

Comparison of Water flow

Impacts On Coastal Area

4. Increasing Salinization for increasing of Draught

5. Scarcity for availability of Freshwater

2. Intrusion of Saline water in upstream

1. Overflow of Embankments and Breaching.

3. Increasing Water Logging

7. Aggressive Sea Current

6. Siltation inside Sundarban, A threat for the forest

TRM at ‘Aila’ affected area: Gabura

Beel Vina TRMDaly 4333 cm silt was deposited in 400 hectare of Beel Vaina4years I month 10 days = 6.5 million cm silt deposited in Vaina basin

Name of RiverWater Logged Areas (in hac.)

1980-1985 1986-19901991-1995

1996-2000

2001-2005 2006-2009

Apar 1500 3600 3600 4300 4300 4300

2200 5100 7300 8100 8100 8100

Horinadi 3100 10400 11600 11600 11600 11600

2600 9400 16900 16900 16900 20400

- 1200 2600 3400 4100 5300

- - 2300 2300 2300 4800

- - - 1300 2300 3500

- - - - 2200 3500

- 2300 9700 18700 23700 47200

` - 1400 6200 8500 11000 14000

- - 1300 3800 7300 9800

Total 9400 33400 61500 78900 93800 132500

Source (WRDS and Pani Committee)

Expanding waterlogged area per year is 5070 hac.This are all fresh water waterlogged areas:

Increase in Salinity with time series in the South West Region