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River morphology as_the_science_of_sustainability
The document discusses river morphology and its impact on sustainability, focusing on concepts such as erosion, sedimentation, and the Exner principle. Various applications like river narrowing for navigation and water withdrawal for irrigation are examined, highlighting short-term effectiveness versus long-term challenges. Lessons learned indicate that modifications to rivers can have overlooked morphological effects that may lead to significant maintenance costs.
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River morphology as_the_science_of_sustainability
- 1. River morphology: the scienceof sustainability Erik Mosselman (extract of original presentation) A joint meeting on river morphology, sediment transport, catchment hydrology and flood forecasting issues Himalaya Hotel, Lalitpur, Nepal, 15 March 2012
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- 5. Fundamental concept: theExner principle ∂zb dqs ∂u + =0 ∂t du ∂x erosion sedimentation erosion sedimentation top view side view of flow in channel with uniform width of flow over horizontal bed
- 6. Application: river narrowingfor navigation constriction
- 7. Application: river narrowingfor navigation constriction
- 8. Application: river narrowingfor navigation long-term equilibrium constriction
- 9. Application: river narrowingfor navigation Bed degradation: advantage of lower flood levels?
- 10. Application: river narrowingfor navigation navigation bottleneck
- 11. Application: river narrowingfor navigation River bed degradation: • Limited depth above fixed layers • Restrictions for sluices and river port entrances • Instability of banks and hydraulic structures • Shift in discharge distribution at bifurcations • and for the Netherlands… angry Germans!
- 12. Application: river narrowingfor navigation Johann Gottfried Tulla In derrule, no As a Regel, keinriver or Fluß oder Bach derin the stream Welt brauchtneeds world mehr als ein Bett more than one bed
- 13. Application: river narrowingfor navigation Oberrhein below Basel 1828 1872 1963
- 14. Application: river narrowingfor navigation Narrowing produced up to 10 m bed degradation
- 15. Application: river narrowingfor navigation
- 16. Application: river narrowingfor navigation Navigation impossible … Construction of lateral canal: Grand Canal d’Alsace
- 17. Application: river narrowingfor navigation
- 18. Application: river narrowingfor navigation
- 19. Application: river narrowingfor navigation
- 20. Application: river narrowingfor navigation Lesson learned: River narrowing to improve navigability: • effective on a short term • leading to expensive measures to maintain navigability on a long term • due to river morphology
- 21. Application: water withdrawalfor irrigation water withdrawal
- 22. Application: water withdrawalfor irrigation water withdrawal
- 23. Application: water withdrawalfor irrigation water withdrawal long-term equilibrium
- 24. Application: water withdrawalfor irrigation water withdrawal
- 25. Application: water withdrawalfor irrigation sedimentation: • rise in bed levels • rise in water levels water withdrawal
- 26. Application: water withdrawalfor irrigation sedimentation: • rise in bed levels • rise in water levels • raised embankments
- 27. Application: water withdrawalfor irrigation sedimentation: • rise in bed levels • rise in water levels • raised embankments
- 28. Application: water withdrawalfor irrigation sedimentation: • rise in bed levels • rise in water levels • raised embankments
- 29. Application: water withdrawalfor irrigation sedimentation: • rise in bed levels • rise in water levels • raised embankments flooding
- 30. Application: water withdrawalfor irrigation Effect of water withdrawal made worse in case of barrages and subsidence flooding
- 31. Application: water withdrawalfor irrigation Lesson learned: Water withdrawal for irrigation: • lowers water levels on a short term • raises flood water levels on a long term • due to river morphology
- 32. Both applications Lesson learned: Morphologicaleffects on long term: • opposite to initial effects, hence easily overlooked • involving high costs
- 33. There is moreto river morphology … RIVER MORPHOLOGY Bed sediment River shape composition Bed Bed Bank Bank degradation aggradation retreat advance
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- 35. Nepalese river morphologists LochanDevkota Umesh Singh
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