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River morphology as_the_science_of_sustainability
 

River morphology as_the_science_of_sustainability

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Extract of presentation "River morphology: the science of sustainability", held in Lalitpur, Nepal, 15 March 2012

Extract of presentation "River morphology: the science of sustainability", held in Lalitpur, Nepal, 15 March 2012

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    River morphology as_the_science_of_sustainability River morphology as_the_science_of_sustainability Presentation Transcript

    • River morphology:the science of sustainabilityErik Mosselman (extract of original presentation)A joint meeting on river morphology, sediment transport,catchment hydrology and flood forecasting issuesHimalaya Hotel, Lalitpur, Nepal, 15 March 2012
    • Nepal, 1985
    • Nepal, 1985
    • Fundamental concept: the Exner principle ∂zb dqs ∂u + =0 ∂t du ∂x erosionsedimentation erosion sedimentation top view side view of flow in channel with uniform widthof flow over horizontal bed
    • Application: river narrowing for navigation constriction
    • Application: river narrowing for navigation constriction
    • Application: river narrowing for navigation long-term equilibrium constriction
    • Application: river narrowing for navigation Bed degradation: advantage of lower flood levels?
    • Application: river narrowing for navigation navigation bottleneck
    • Application: river narrowing for navigationRiver 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!
    • Application: river narrowing for navigationJohann 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
    • Application: river narrowing for navigation Oberrhein below Basel 1828 1872 1963
    • Application: river narrowing for navigation Narrowing produced up to 10 m bed degradation
    • Application: river narrowing for navigation
    • Application: river narrowing for navigation Navigation impossible … Construction of lateral canal: Grand Canal d’Alsace
    • Application: river narrowing for navigation
    • Application: river narrowing for navigation
    • Application: river narrowing for navigation
    • Application: river narrowing for navigationLesson 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
    • Application: water withdrawal for irrigation water withdrawal
    • Application: water withdrawal for irrigation water withdrawal
    • Application: water withdrawal for irrigation water withdrawal long-term equilibrium
    • Application: water withdrawal for irrigation water withdrawal
    • Application: water withdrawal for irrigation sedimentation: • rise in bed levels • rise in water levels water withdrawal
    • Application: water withdrawal for irrigation sedimentation: • rise in bed levels • rise in water levels • raised embankments
    • Application: water withdrawal for irrigation sedimentation: • rise in bed levels • rise in water levels • raised embankments
    • Application: water withdrawal for irrigation sedimentation: • rise in bed levels • rise in water levels • raised embankments
    • Application: water withdrawal for irrigation sedimentation: • rise in bed levels • rise in water levels • raised embankments flooding
    • Application: water withdrawal for irrigation Effect of water withdrawal made worse in case of barrages and subsidence flooding
    • Application: water withdrawal for irrigationLesson learned:Water withdrawal for irrigation:• lowers water levels on a short term• raises flood water levels on a long term• due to river morphology
    • Both applicationsLesson learned:Morphological effects on long term:• opposite to initial effects, hence easily overlooked• involving high costs
    • There is more to river morphology … RIVER MORPHOLOGY Bed sediment River shape composition Bed Bed Bank Bank degradation aggradation retreat advance
    • Nepalese river morphologistsSanjay Giri
    • Nepalese river morphologistsLochan Devkota Umesh Singh
    • Nepalese river morphologists
    • Nepalese river morphologists