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Bank stability for predicting reach-scale land loss and sediment yield

Amiri-Tokaldany, E., Darby, S.E. and Tosswell, P. (2003) Bank stability for predicting reach-scale land loss and sediment yield Journal of the American Water Resources Association, 39, (4), pp. 897-910.

Record type: Article

Abstract

When extensive lengths of river become stabilized (e.g., by channel incision), riverbank erosion can result in considerable riparian land loss and the delivery of large volumes of sediment downstream. The ability to predict the stability and failure geometry of eroding riverbanks is therefore an important prerequisite in estimating the rate of bank erosion and sediment yield associated with bank erosion. In this paper, a new stability analysis for layered river banks is introduced. The new analysis differs from many previous analyses in that it takes into consideration the effects of positive pore water pressure in the saturated portion, and negative pore water pressure in the unsaturated portion, of the bank as well as the influence of hydrostatic confining pressure due to the water level in the river. In addition, the failure plane is not constrained to pass through the toe of the bank and the bank profile geometry is not restricted to an idealized special case. The predictive ability of the new bank stability analysis is assessed using data from two field sites. Subsequently, a methodology for applying the bank stability analysis at the scale of the river reach (0.1 to 10 km) is discussed. This method involves the use of empirical models of bed level adjustment to estimate the magnitude of incision at specific locations along the reach, with these estimates used to drive the stability analysis. Application of the new method is demonstrated with an example.

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Published date: 2003

Identifiers

Local EPrints ID: 14799
URI: http://eprints.soton.ac.uk/id/eprint/14799
PURE UUID: 2bf0e112-a3de-4201-a204-28486fe0fcd0

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Date deposited: 01 Mar 2005
Last modified: 17 Jul 2017 16:52

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Contributors

Author: E. Amiri-Tokaldany
Author: S.E. Darby
Author: P. Tosswell

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