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