Predicting the morphology of UK estuaries using a 3D form model

Predicting the morphology of UK estuaries using a 3D form model.
Townend, I.H.
In: RCEM 2011 (7th IAHR Symposium on River, Coastal and Estuarine Morphodynamics), 6-8 September 2011, Beijing, China. (2011)

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Abstract:The most common definition of an equilibrium condition for estuaries and inlets makes useof the well documented relationship between tidal prism and the cross-sectional area of the channel.However, the tidal prism is itself a function of the morphology of the tidal basin. It would therefore beuseful to be able to define the key dimensions of estuaries and inlets based on external or pre-definedparameters such as tidal range, river discharge, valley length, nature of the valley bed and the type ofsediments available as a supply. To this end an idealised 3D morphology model is proposed based on theequilibrium form of the constituent parts, namely the plan form, low water channel cross-section andintertidal profile. The model is applied to a wide range of UK estuaries to explore its ability to predict thegross properties (volumes and surface areas of the channels and intertidal flats) of a range of differentestuary types. When considering just tidal flow, the model was found to provide an adequaterepresentation of UK estuary properties, such as surface area and volume at mean tide level, but a muchpoorer representation of areas and volumes of the low water channel and the tidal flats. The inclusion ofan idealised representation ofthe equilibrium profile generated by wave action was found to significantlyimprove the predictive power of the model when used to estimate the properties of 64 UK estuaries.
Item Type:Conference or Workshop Item (Paper)
Subjects:Maritime > General
Maritime > Estuary management
Coasts > Sediment transport and scour
Coasts > General
ID Code:501
Deposited On:23 Sep 2011 14:29
Last Modified:19 Jul 2017 07:57

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