Riverbank Stability Analysis. II: Applications

Thorne, Colin R.; Osman, Ali

doi:10.1061/(asce)0733-9429(1988)114:2(151)

Cited by 68 publications

(31 citation statements)

References 7 publications

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“…Width adjustments in the model are based on the assumption that channel banks retreat as a function of changes in bed elevation, which is consistent with current understanding that bank instability is primarily a function of bank height and geotechnical properties (Thorne and Osman, 1988;. For model simplicity, it is assumed that the relationship between bed degradation and channel widening is linear, although more elaborate computational methods for bank stability analysis are available Simon and Darby, 1997) and could be used in subsequent work.…”

Section: Channel Wideningmentioning

confidence: 90%

“…as a linear function of bed erosion. Rather, bed erosion often proceeds without any change to channel width until a threshold is crossed (bank critical height), at which time rapid widening begins (Thorne and Osman, 1988). Initiation of channel widening represents a mechanistic threshold in the overall geomorphic channel adjustments , and thus coupling bed erosion with mechanistic bank erosion models has been the source of great interest (Hey, 1979;.…”

Section: Equilibrium Timescalesmentioning

confidence: 99%

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Modelling the effect of form and profile adjustments on channel equilibrium timescales

Doyle¹,

Harbor²

2003

Earth Surf Processes Landf

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A model for describing river channel profile adjustments through time is developed and applied to a river responding to baselevel lowering in order to examine the effect of channel widening and downstream aggradation on equilibrium timescales. Across a range of boundary conditions, downstream aggradation controlled how quickly a channel reached equilibrium. Channel widening either increased or decreased the equilibrium timescale, depending on whether or not sediment derived from widening was deposited downstream. Results suggest that profile adjustments are more important than channel width adjustments in controlling equilibrium timescales for a channel responding to base-level lowering.

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Section: Channel Wideningmentioning

confidence: 90%

Section: Equilibrium Timescalesmentioning

confidence: 99%

Modelling the effect of form and profile adjustments on channel equilibrium timescales

Doyle¹,

Harbor²

2003

Earth Surf Processes Landf

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“…Three of such mechanisms could be attributed for the causes of erosion along the River Liza's bank as observed from the field study. They are what Thorne and Osman [25] calls 'shear and toppling' failures, and trampling which is as a result of people and cattle crossing the river channel or walking along the bank of the river channel. Example of the bank erosion which might have been as a result of shear and toppling failures is shown in figure 5 below.…”

Section: Channel Planform Changementioning

confidence: 99%

Long-term change of the River Liza, Wild Ennerdale, England

Oyedotun¹

2011

WIT Transactions on Ecology and the Environment

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The long-term change of the River Liza in the Ennerdale valley, Cumbria, was mapped and analysed using Geographical Information System (GIS) techniques. In this paper, the focus was on the use of GIS to investigate, map and analyse the changes in the River Liza's meandering channel system. Cartographical modelling, planform morphological analysis and cross-sectional analysis were methods of analysis employed in the study. The datasets used were largely digitized River Liza's channel from the historical maps, aerial photo maps and Differential Global Positioning System (DGPS) Field Survey data. It was discovered in the study that River Liza maintained a stable pattern of movement until it became diverted at Latitude 54 o 30' 47.07" and Longitude 3 o 18' 15.05" between 1993 and 2009. However, the channel's widths and depths have been far from stable; they have been increasing as a result of constant erosion of the bank and deposition within the channel, especially since the 1970s when there have been increases in rainfall in the UK. Apart from the presence of man-made features like bridges and bulwarks, the River Liza is discovered to be one of the important features in Ennerdale Valley where natural processes have been allowed to take their course in shaping the landscape and the ecology of the valley

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“…Retreat -The explanation, prediction and stabilization of bank retreat are all aided by the application of new approaches to the analysis of flow erosion processes and geotechnical failure (Thorne and Osman, 1988;Thorne and Abt, 1990;Hagerty, 1989). The input data and qualitative information necessary to apply such methods are collected in the course of using the stream reconnaissance sheets.…”

Section: In the Assessment Modelling And Control Of Bankmentioning

confidence: 99%

Field Assessment Techniques for Bank Erosion Modeling

Thorne¹

1992

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Riverbank Stability Analysis. II: Applications

Cited by 68 publications

References 7 publications

Modelling the effect of form and profile adjustments on channel equilibrium timescales

Modelling the effect of form and profile adjustments on channel equilibrium timescales

Long-term change of the River Liza, Wild Ennerdale, England

Field Assessment Techniques for Bank Erosion Modeling

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