Experimental Investigation of Erosion Characteristics of Fine-Grained Cohesive Sediments

A - Papers appearing in refereed journals

Krishnappan, B. G., Stone, M., Granger, S. J., Upadhayay, H. R., Tang, Q., Zhang, Y. and Collins, A. L. 2020. Experimental Investigation of Erosion Characteristics of Fine-Grained Cohesive Sediments. Water. 12 (5), p. 1511. https://doi.org/10.3390/w12051511

AuthorsKrishnappan, B. G., Stone, M., Granger, S. J., Upadhayay, H. R., Tang, Q., Zhang, Y. and Collins, A. L.
Abstract

In this short communication, the erosion process of the fine, cohesive sediment collected from the upper River Taw in South West England was studied in a rotating annular flume located in the National Water Research Institute in Burlington, Ontario, Canada. This study is part of a research project that is underway to model the transport of fine sediment and the associated nutrients in that river system. The erosion experimental data show that the critical shear stress for erosion of the upper River Taw sediment is about 0.09 Pa and it did not depend on the age of sediment deposit. The eroded sediment was transported in a flocculated form and the agent of flocculation for the upper River Taw sediment may be due to the presence of fibrils from microorganisms and organic material in the system. The experimental data were analysed using a curve fitting approach of Krone [1] and a mathematical model of cohesive sediment transport in rotating circular flumes developed by Krishnappan [2]. The modelled and measured data were in good agreement. An evaluation of the physical significance of Krone’s fitting coefficients is presented. Variability of the fitting coefficients as a function of bed shear stress and age of sediment deposit indicate the key role these two factors play in the erosion process of fluvial cohesive sediment.

KeywordsErosion; Cohesive sediments; Rotating circular flume; Mathematical modelling; Fitting coefficients; Sediment deposition; Flocculation; Bed shear stress; Consolidation
Year of Publication2020
JournalWater
Journal citation12 (5), p. 1511
Digital Object Identifier (DOI)https://doi.org/10.3390/w12051511
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 3 (WP3) - Sustainable intensification - optimisation at multiple scales
Publisher's version
Output statusPublished
Publication dates
Online25 May 2020
Publication process dates
Accepted22 May 2020

Permalink - https://repository.rothamsted.ac.uk/item/97vy0/experimental-investigation-of-erosion-characteristics-of-fine-grained-cohesive-sediments

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