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Determination of sediment discharge of lowland rivers under extreme conditions
Conclusions The relations given for the total sediment discharge, theoretically related to unsteady flows in the core and bottom layer of the flow, show: An inverse (hyperbolic) dependence of the sediment discharge on depth of the flow. By reducing the latter, one can realize a channel flow with a maximum transporting capacity; an increased transporting capacity of the flow in laboratory flumes compared with the prototype (usually by an order); substantial decrease of the transporting capacity as a result of a phase shift of fluctuations in the bottom layer for d>0.7 mm and its increase for d<0.7 mm; dependence of the sediment load on the size of the sediment and effect of capillary forces on a shallow flow. The given analysis of channel formation from the standpoint of consideration of transient effects of channel lowfrequency turbulence is not customary. However, it comes after setting up the solution of problems characteristic of flows in which large-scale coherent formations already figured in articles, mainly of Japanese authors, and reflect the dynamic essence of turbulence little known to us [17, 18].
Determination of sediment discharge of lowland rivers under extreme conditions
Conclusions The relations given for the total sediment discharge, theoretically related to unsteady flows in the core and bottom layer of the flow, show: An inverse (hyperbolic) dependence of the sediment discharge on depth of the flow. By reducing the latter, one can realize a channel flow with a maximum transporting capacity; an increased transporting capacity of the flow in laboratory flumes compared with the prototype (usually by an order); substantial decrease of the transporting capacity as a result of a phase shift of fluctuations in the bottom layer for d>0.7 mm and its increase for d<0.7 mm; dependence of the sediment load on the size of the sediment and effect of capillary forces on a shallow flow. The given analysis of channel formation from the standpoint of consideration of transient effects of channel lowfrequency turbulence is not customary. However, it comes after setting up the solution of problems characteristic of flows in which large-scale coherent formations already figured in articles, mainly of Japanese authors, and reflect the dynamic essence of turbulence little known to us [17, 18].
Determination of sediment discharge of lowland rivers under extreme conditions
Altunina, E. I. (author) / Ostankov, A. A. (author) / Okhremenko, I. M. (author) / Lyapin, A. N. (author)
Hydrotechnical Construction ; 27 ; 413-418
1993-07-01
6 pages
Article (Journal)
Electronic Resource
English
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