Summary of Paper 7362. The Slope and Resistance of Small Meandering Channels.

Ackers, Peter; Charlton, Fg

doi:10.1680/iicep.1970.6579

Cited by 23 publications

(36 citation statements)

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“…The section in-between is the range of 'unorganized meandering', and interestingly enough, in the case of the Tisza River this section coincides with the zone of intermediate streams (sensu Lane, 1957) and the wandering flow pattern (sensu Miall, 1977). Leopold and Wolman, 1957;Ackers and Charlton, 1971), and the plot of the alluvial section of the Tisza River, showing the river planform change from braided, via wandering to meandering. For the determination of the line of maximum sinuosity (dashed), see Fig.…”

Section: Interpretation In Terms Of River Dynamicsmentioning

confidence: 78%

“…6, which gives the sinuosity vs. slope relationship, together with the discrimination lines between straight, meandering and braided patterns. The same discrimination lines were presented on the graphs of Leopold and Wolman (1957) and Ackers and Charlton (1971) in a co-ordinate system of bankfull discharge and channel slope. As the two graphs have different meanings of 'slope' (valley and channel), the one of Schumm and Khan (1972) was recalculated in order to have the channel slope as a horizontal axis.…”

Section: Interpretation In Terms Of River Dynamicsmentioning

confidence: 97%

“…6). To construct this chart, it is assumed that the relationship of Schumm and Khan (1972) is basically valid for different values of discharge, therefore similar graphs can be drawn between the two discrimination lines of Leopold and Wolman (1957) and Ackers and Charlton (1971) at any discharge (Fig. 6).…”

Section: Interpretation In Terms Of River Dynamicsmentioning

confidence: 99%

“…6 (see text for discussion). ) showing the slope resulting the maximum sinuosity at any discharge by the combination of the channel slope vs. bankfull discharge diagram (Leopold and Wolman, 1957;Ackers and Charlton, 1971) with the chart of sinuosity vs. slope (after Schumm and Khan, 1972). The vertical axis has no units because of the qualitative approach of the combination.…”

Section: Interpretation In Terms Of River Dynamicsmentioning

confidence: 99%

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Controls on channel sinuosity changes: a case study of the Tisza River, the Great Hungarian Plain

Timár

2003

Quaternary Science Reviews

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The planform geometry of the Tisza, the trunk river of the subsiding Great Hungarian Plain is studied by reconstruction of the last pre-regulation river course. The thalweg sinuosity has been computed for the main alluvial section of the river. Remarkable sinuosity changes have been found to correlate with discharge and sediment load changes at the inflow of tributaries, as well as with active deformation areas, like differential subsidence and wrench fault zones.Analysing the change of the river pattern, a new discrimination line has been derived, which separates the meandering zone on the classic slope vs. discharge diagram into two subzones. The first subzone (lower slope values) corresponds to a range of true, selforganized meandering. The second subzone (higher slope values) corresponds to a range of 'unorganized meandering'. This is a range where river sinuosity decreases although the channel slope increases. In the case of the Tisza River, this subzone equals to the wandering river pattern. r

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Section: Interpretation In Terms Of River Dynamicsmentioning

confidence: 78%

Section: Interpretation In Terms Of River Dynamicsmentioning

confidence: 97%

Section: Interpretation In Terms Of River Dynamicsmentioning

confidence: 99%

Section: Interpretation In Terms Of River Dynamicsmentioning

confidence: 99%

See 2 more Smart Citations

Controls on channel sinuosity changes: a case study of the Tisza River, the Great Hungarian Plain

Timár

2003

Quaternary Science Reviews

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“…Also, shallow water in the young stage is conducive to heavy sediment accumulation, and sediment accumulation is believed by many scholars to be favourable to the development of a braided pattern (Chien and Zhou, 1965;Ackers and Charlton, 1970;Thornes, 1979;Carson, 1984). Thus, besides a favourable stream 623 power, which may be enough to keep a braided pattern, the obvious braided pattern in the young stage of the mouth channel is attributable to the low banks of the channel during development and rapid siltation.…”

Section: Mechanisms Of Channel Pattern Adjustmentmentioning

confidence: 99%

Processes and mechanisms of dynamic channel adjustment to delta progradation: the case of the mouth channel of the Yellow River, China

Shi

Zhang

2003

Earth Surf Processes Landf

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This paper analyses the processes and mechanisms of a three-stage channel adjustment over a cycle of the Yellow River mouth channel extension based on data comprising hydrologic measurements and channel geometric surveys. Rapid siltation in the mouth channel takes place in the young stage when the channel is being built by deposits and in the old stage when the channel cannot further adjust itself to keep sediment transport in equilibrium. It is disclosed that the bankfull width-depth ratio, bed material size and slope decrease in the young and mature stages but do not change in the old stage. The reduction of bankfull width-depth ratio and bed material size during the young and mature stages is found to be able to offset the effect of the slope reduction on sediment transport due to continuous mouth progradation. They reach their limits in old stage, and a constant slope is kept by unceasing sediment accumulation. The grain size composition of incoming sediment and the fining mechanism are responsible for the occurrence of lower limit of bed material size. The reason for the existence of a limit of bankfull cross-sectional shape is that the large flows can fully transport the sediment load they are carrying, and siltation in the channel in the old stage takes place mainly in the low flows. It is suggested that the bankfull discharge plays an important role in shaping the channel but that the entire channel form is the product of both the large and low flows plus the effects of interaction between them. Channel pattern change shows a process from a braided pattern in the young stage to a straight pattern in the mature and old stages, and the straight channel becomes gradually sinuous. The occurrence and transformation of the channel patterns are supported by two planform predictors, but are also facilitated by some other conditions.

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Rational regime model of alluvial channel morphology and response

Eaton

Church

Millar

2004

Earth Surf Processes Landf

163

124

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A theoretical model is developed for predicting equilibrium alluvial channel form. The concept of greatest relative stability, achieved by maximizing resistance to flow in the fluvial system, is presented as the basis for an optimization condition for alluvial systems. Discharge, sediment supply (quantity and calibre) and valley gradient are accepted as independent governing variates. The model is used to define a dimensionless alluvial state space characterized by aspect ratio (

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Summary of Paper 7362. The Slope and Resistance of Small Meandering Channels.

Cited by 23 publications

References 0 publications

Controls on channel sinuosity changes: a case study of the Tisza River, the Great Hungarian Plain

Controls on channel sinuosity changes: a case study of the Tisza River, the Great Hungarian Plain

Processes and mechanisms of dynamic channel adjustment to delta progradation: the case of the mouth channel of the Yellow River, China

Rational regime model of alluvial channel morphology and response

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