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effect of slope on the stability of riverbanks with a mobile bed: an experimental study
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نویسنده
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jamea mohammad ,solimani babarsad mohsen ,poormohammadi mohammad hosein ,ghorbanizadeh kharrazi hosein
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منبع
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هيدروليك - 2024 - دوره : 18 - شماره : 4 - صفحه:61 -68
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چکیده
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The interaction of the flow and riverbank particles might cause riverbank erosion and collapse in the long term. in riverbank areas with deposited fine sediments subjected to the tides and changes in water level, there is a greater possibility of bank collapse, and the establishment of heavyweight protective structures and ripraps makes the bank more unstable. this research aims to study the effects of changing slope on riverbank stability in mobile bed conditions. accordingly, 21 experiments were conducted on the sediments at different depths with three different gradients (20, 25, and 30 degrees). according to the results, the riverbank with a 20-degree slope was destroyed after the other two slopes (25 and 30 degrees). with froude numbers over 0.2, all the banks became unstable; however, it takes a longer time for the lower slope, compared to the other slopes, to become unstable. by the increase in the froude number of paricles frd and the flow depth, the collapse time tf also decreased, which can be explained by moving away from the incipient motion of the bed and bank particles. in addition, the destruction occurred faster under live bed conditions, compared to clear water conditions.
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کلیدواژه
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mobile bed ,bank slope ,froude number of particles ,incipient motion
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آدرس
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shoushtar branch, islamic azad university, department of civil engineering, water resources engineering and management, iran, shoushtar branch, islamic azad university, water science and environmental research center, department of water sciences, iran, shoushtar branch, islamic azad university, department of civil engineering, water resources engineering and management, iran, shoushtar branch, islamic azad university, water science and environmental research center, department of water sciences, iran
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پست الکترونیکی
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h.ghorbanizadeh@gmail.com
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effect of slope on the stability of riverbanks with a mobile bed: an experimental study
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Authors
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Abstract
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the interaction of the flow and riverbank particles might cause riverbank erosion and collapse in the long term. in riverbank areas with deposited fine sediments subjected to the tides and changes in water level, there is a greater possibility of bank collapse, and the establishment of heavyweight protective structures and ripraps makes the bank more unstable. this research aims to study the effects of changing slope on riverbank stability in mobile bed conditions. accordingly, 21 experiments were conducted on the sediments at different depths with three different gradients (20, 25, and 30 degrees). according to the results, the riverbank with a 20-degree slope was destroyed after the other two slopes (25 and 30 degrees). with froude numbers over 0.2, all the banks became unstable; however, it takes a longer time for the lower slope, compared to the other slopes, to become unstable. by the increase in the froude number of paricles frd and the flow depth, the collapse time tf also decreased, which can be explained by moving away from the incipient motion of the bed and bank particles. in addition, the destruction occurred faster under live bed conditions, compared to clear water conditions.
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Keywords
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mobile bed ,bank slope ,froude number of particles ,incipient motion
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