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Bed clusters in humid perennial and Mediterranean ephemeral gravel-bed streams: The effect of clast size and bed material sorting

Lookup NU author(s): Emeritus Professor Malcolm Newson

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Abstract

A short review of the literature on particle clusters on gravel river beds reveals investigations of both process and form dominated by the intensive study approach, using a restricted geographical sample or evidence from flumes. An alternative, presented here, is extensive sampling - from three climatic zones, several channels in each and at multiple transects at each site. It uses insights provided by a more intensively studied 'base station' [Wittenberg, L., Newson, M.D., 2005. Particle clusters in gravel-bed rivers - an experimental morphological approach to bed material transport and stability concepts. Earth Surface Processes and Landforms 30(11), 1351-1368]. Transect surveys were completed in each selected reach to establish flow_depth, bed material size and bed structure. A total of more than 5000 sample points reveals the vital presence of bed material of ≈100 mm D50 for all sub-types of clusters to occur; thereafter, cluster frequency relates directly to the D90, with an improving correlation at D90 > 256 mm. A better integration of data from the diverse hydrological/hydraulic regimes can be achieved by correlating cluster frequency with a sorting index for bed material. Further analysis of hydrological and hydraulic data for all sites is required to develop a dynamic explanation. © 2006 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Wittenberg L, Laronne JB, Newson MD

Publication type: Article

Publication status: Published

Journal: Journal of Hydrology

Year: 2007

Volume: 334

Issue: 3-4

Pages: 312-318

ISSN (print): 0022-1694

ISSN (electronic):

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.jhydrol.2006.09.028

DOI: 10.1016/j.jhydrol.2006.09.028

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