Modeling Interactions between Riverbank Hydrology and Mass Failures
Publication: Journal of Hydrologic Engineering
Volume 18, Issue 10
Abstract
Riverbank retreat derives from a complex combination of various processes where a key role is played by the interactions of groundwater and surface water. Recent progress has been made in two main research areas, i.e., the effects of hydrological factors on mass failures, and the role of subsurface flow in seepage erosion and bank stability. This paper aims to review recent progress and identify the main knowledge gaps in modeling riverbank failures, with a particular focus on the interactions between mass failures, bank hydrology and other hydrological factors related to the river hydrograph. Changes in pore water pressures related to transient variations of surface water and groundwater are widely recognized as one of the most important factors controlling the onset and timing of bank instability. Inclusion of negative pore water pressures and groundwater flow modeling has greatly improved the capability to predict mass failures. Fluvial erosion has a fundamental role in deforming the bank profile and, therefore, promoting bank instability. However, fluvial erosion may also affect bank stability indirectly, as deformation of the bank profile alters the pore water pressure field within the bank. Seepage flow determines an important control on bank instability by two mechanisms: hydraulic gradient forces, causing possible mass failure or liquefaction; and seepage erosion and undercutting, eventually inducing a collapse of the upper bank. This review has led to the identification of the main knowledge gaps and needs for future research in two main areas: (1) parameterization of various soil properties that need to be accounted for when modeling hydrologic processes and mass failures; and (2) the need for integrated modeling of seepage and fluvial erosion and how they simultaneously may affect mass failures.
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Acknowledgments
The authors acknowledge Dr. Stephen E. Darby, Glenn V. Wilson, and another anonymous reviewer whose comments greatly improved the manuscript.
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Published In
Journal of Hydrologic Engineering
Volume 18 • Issue 10 • October 2013
Pages: 1231 - 1240
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© 2013 American Society of Civil Engineers.
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Received: Nov 15, 2011
Accepted: Sep 19, 2012
Published online: Jun 5, 2013
Published in print: Oct 1, 2013
Discussion open until: Nov 5, 2013
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