An improved Cauchy number approach for predicting the drag and reconfiguration of flexible vegetation

Whittaker, Peter, Wilson, Catherine A. M. E. ORCID: https://orcid.org/0000-0002-7128-590X and Aberle, Jochen 2015. An improved Cauchy number approach for predicting the drag and reconfiguration of flexible vegetation. Advances in Water Resources 83 , pp. 28-35. 10.1016/j.advwatres.2015.05.005

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Abstract

An improved model to describe the drag and reconfiguration of flexible riparian vegetation is proposed. The key improvement over previous models is the use of a refined ‘vegetative’ Cauchy number to explicitly determine the magnitude and rate of the vegetation's reconfiguration. After being derived from dimensional consideration, the model is applied to two experimental data sets. The first contains high-resolution drag force and physical property measurements for twenty-one foliated and defoliated full-scale trees, including specimens of Alnus glutinosa, Populus nigra and Salix alba. The second data set is independent and of a different scale, consisting of drag force and physical property measurements for natural and artificial branches of willow and poplar, under partially and fully submerged flow conditions. Good agreement between the measured and predicted drag forces is observed for both data sets, especially when compared to a more typical ‘rigid’ approximation, where the effects of reconfiguration are neglected.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering
Uncontrolled Keywords:	Vegetation; Drag force; Reconfiguration; Foliage; Vogel exponent
Publisher:	Elsevier
ISSN:	0309-1708
Date of Acceptance:	10 May 2015
Last Modified:	01 Nov 2022 10:21
URI:	https://orca.cardiff.ac.uk/id/eprint/91140

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