Regime modelling of morphology

Regime modelling of morphology.
Spearman, J.
In: RCEM 2007 (5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics), 17 - 21 September 2007 , The Netherlands. (2007)

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Abstract:Estuary morphology studies often adopt an approach, commonly termed Expert Geomorphological Assessment (EGA), based around the use of empirical or simple analytical relationships, aided by broad rules of thumb and expert judgement. In a recent research project funded by the Department of the Environment, Food and Rural Affairs in the UK the tools for assessing the future evolution of estuary morphology have been reviewed and formalised. As part of this review the use of Regime Theory was considered, a tool often used in EGA. In simple terms this approach adopts some characteristic relationship between hydrodynamics and estuary morphology, such as tidal prism and cross-section area, and uses this simple formula to describe estuary equilibrium. The validity of this approach is explored. By considering how flow parameters will change as a result of anthropogenic intervention, or as a result of natural processes, it is possible to use Regime Theory to make an assessment of how the morphology will evolve as a result. Perturbation analysis indicates that the use of Regime Theory, when combined iteratively with a flow model, approximates to long term sediment transport, providing certain conditions are satisfied. However, the form of the resultant characteristic regime relationship resulting from the perturbation analysis is different to those commonly used in the literature and demonstrates the importance of sediment supply to the nature of estuary equilibrium. The consequences of this result are discussed in the context of the evolu-tion of muddy estuaries. The differences in the nature of evolution of muddy estuaries and sandy estuaries are discussed.
Item Type:Conference or Workshop Item (Paper)
Subjects:Maritime > General
Maritime > Estuary management
ID Code:316
Deposited On:19 Jun 2009 14:27
Last Modified:19 Jul 2017 07:56

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