A parameterization for flow separation in a river dune development model


Paarlberg, A.J. and Dohmen-Janssen, C.M. and Hulscher, S.J.M.H. and Termes, A.P.P. (2006) A parameterization for flow separation in a river dune development model. In: G. Parker & M.H. García (Eds.), River, Coastal and Estuarine Morphodynamics, Vol II. , pp. 883-895. ISBN 9780415392709

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Abstract:To simulate dune development, a model based on the two-dimensional vertical shallow water equations is applied to flume conditions. Realistic bedform behaviour of dunes with gentle slopes is obtained: dunes grow in amplitude, develop into asymmetric features and migrate. Due to a constant eddy viscosity in the model, flowseparation cannot be treated explicitly. Therefore, a parameterization for flowseparation is proposed, based on flume data. A parameterization is derived for the separating streamline, which is the upper boundary of the flow separation zone, and which can be used as bed level for flow computations. The shape of the flow separation zone is found to be independent of flow conditions, and is related to the height and local bed angle at the separation point, and to the angle of the separating streamline at the reattachment point. The parameterization is in reasonable agreement with flume data.
Item Type:Book Section
Copyright:© 2006 Taylor & Francis
Engineering Technology (CTW)
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