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River Erosion In Bangladesh

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River Erosion In Bangladesh

  1. 1. HAVEEVER THOUGHT YOU
  2. 2. EROSION ABOUT RIVER AND HOW IT’S AFFECTING BANGLADESH
  3. 3. River Erosion Wearing away of rocks and other deposits from earth’s surface by the action of water, ice, glacier, winds, waves etc. Affecting the socio-economic situation A hindrance in sustainable development Leaves a long lasting devastating affect in the lives of the sufferes Erosion also involves the breaking down of the rock particles being carried downstream by the river
  4. 4. River Erosion: A Threat to Bangladesh An endemic and recurrent natural hazard in Bangladesh Bangladesh considered as a river reign country 5% Floodplain of Bangladesh is directly affected by river erosion Nearly 94 upazilas near major rivers are sufferers of river erosion 34 upazilas are severely affected including Kajipur, Faridpur, Shariyatpur, Madaripur, Comilla, Chadpur, Shirajganj About 700 rivers and 60 of them are major rivers In a year about 2400 km of river bank line experiences major erosion About 40% migration to Dhaka is due to river erosion
  5. 5. Processes of river erosion: Hydraulic Action: Decomposition of rock particles from river bed due to water pressure Occurs near water falls and fierce forced streams of rivers Abrasion: Wearing away of river banks by river sediments. Occurs during the depression stage of rivers
  6. 6. Attrition: Eroded particles collide and break into smaller particles Corrosion: Carbon di oxide dissolves in the river to form a weak acid. The edges of rock particles becomes more rounded and smaller Attrition makes the sediment particles smaller It forms limestones and chalks are found as sediments
  7. 7. The major rivers responsible for river erosion: The Padma The Upper Meghna The Lower Meghna The Jamuna The Brahmaputra
  8. 8. THE MAJOR CAUSE FOR RIVER EROSION SHIFTING OF RIVER CHANNELS
  9. 9. Source: Google Earth
  10. 10. Jamuna Ganges Padma Upper Meghna Lower Meghna Bank Erosion Rate (m/year) Left 100 20 38 7 66 Right 84 56 121 9 182 Maximum Bank Erosion Rate (m/year) 784 665 620 NA 824 Rate of river erosion Source: ISPN,1995, Rates are derived from 1984-1992
  11. 11. Width decrease in major rivers: The Jamuna The Brahmaputra The Padma The Upper Meghna The Lower Meghna Average width (m) 1984 9,720 4,367 5,689 3,406 6,661 1993 11,220 4,693 7,116 3,391 8,897 Rate of change of width(m/year) 184 36 159 2 248 Source: ISPN,1995
  12. 12. Micro-level Analysis On Kazipur upazila: Situated near the Brahmaputra river Severely affected by river erosion Source: Google Map
  13. 13. Scenario of a river erosion affected area: Kazipur-a upazila of 11 unions During 2009 the nearest branch of the river grew and shifted 200 meter west As a result Kazipur lost estimated 2,000 acres OR 40% of agricultural land Brahmaputra Right Bank flood control embankment passes through the upazila of Kazipur. It could stop flooding not erosion. An luminous example of how prevention is ineffective in case of river erosion
  14. 14. Before river erosion After river erosion Source: Google Earth
  15. 15. Socio-economic effects Estimated 1,000,000 people are affected annually Estimated 500,000,000 USD monetary loss annually A big set back for agriculture Erodes farmland, infrastructure and communication system Lifestyles of native people degrades drastically Affected people lose assets and fall in future debt Migration of inhabitants River erosion is considered as a major cause of growing poverty
  16. 16. A Family Which Has Been The Cruelest Victim Of River Erosion Tale of a Taher Mollah Source: USAID
  17. 17. Taher Mollah- scenario of 2012 Used to own 60 bighas (20 acres) of land Born in 1950 in a well off family in khidirpur. Lived as a day labourer in the city of Rajshahi Still hoped of going back to the char when it will rise. Due to river erosion he has lost all. Even his living place. Irony of his life was he never got to see his living place again. Source: USAID
  18. 18. PREDICTION METHOD OF RIVER EROSION USING RIVER MORPHOLOGY River Morphology: Describes how river channels change directions and shapes with time Recent satellite images Re-derived methods based on channel network analysis Tools used:
  19. 19. GOVERNMENT MEASURES PREVENTION MITIGATION NOT
  20. 20. TWO MAJOR PROJECTS: JAMUNA-MEGHNA RIVER EROSION MITIGATION PROJECT DISSAPPEARING LANDS PROJECT Enhance Economic Growth Reduce Poverty Ensure Livelihood Security Already Changed About 2,000,000 Peoples’ lives Objectives Of The Projects
  21. 21. BEING COMPASSIONATE IS THE KEY

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