The variability of marine sediment erodibility with depth: centimetric scale effects detected from portable erosion flume tests
The variability of marine sediment erodibility with depth: centimetric scale effects detected from portable erosion flume tests
A portable erosion flume has been developed that is capable of estimating erosion threshold and erosion rate relationships for fine-grained specimens over the depth of a typical sample tube. This newly-designed apparatus is a recirculating flume capable of generating steady currents over the exposed section of the sample. In this paper, the erosion properties of two marine sediments have been determined and show a significant systematic variation with depth at centimetre scale that would have implications for the potential need for scour protection engineering. The tests showed that the critical erosion onset velocity doubled over the upper 200 mm of each sample, and the erosion rate fell by an order of magnitude. The increased erosion resistance with depth is consistent with the general trend of erodibility reducing with decreasing moisture content. Ignoring this depth effect when selecting design values of the erosion properties could lead to erroneous predictions of scour rate and extent around subsea structures, and unnecessary scour protection engineering costs.
Erosion rate, Erosion threshold, Marine sediments, Portable erosion flume, Scour prediction, Subsea pipelines
Mohr, Henning
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Stanier, Samuel A.
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White, David J.
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Kuo, Matthew
200cb9a8-fa75-4647-a3ed-81441e68c449
August 2021
Mohr, Henning
2afb09e1-17c7-4875-ac8a-cd15850c1e91
Stanier, Samuel A.
b11049bd-44ee-4db9-9e66-a5ea20a3c70b
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93
Kuo, Matthew
200cb9a8-fa75-4647-a3ed-81441e68c449
Mohr, Henning, Stanier, Samuel A., White, David J. and Kuo, Matthew
(2021)
The variability of marine sediment erodibility with depth: centimetric scale effects detected from portable erosion flume tests.
Applied Ocean Research, 113, [102721].
(doi:10.1016/j.apor.2021.102721).
Abstract
A portable erosion flume has been developed that is capable of estimating erosion threshold and erosion rate relationships for fine-grained specimens over the depth of a typical sample tube. This newly-designed apparatus is a recirculating flume capable of generating steady currents over the exposed section of the sample. In this paper, the erosion properties of two marine sediments have been determined and show a significant systematic variation with depth at centimetre scale that would have implications for the potential need for scour protection engineering. The tests showed that the critical erosion onset velocity doubled over the upper 200 mm of each sample, and the erosion rate fell by an order of magnitude. The increased erosion resistance with depth is consistent with the general trend of erodibility reducing with decreasing moisture content. Ignoring this depth effect when selecting design values of the erosion properties could lead to erroneous predictions of scour rate and extent around subsea structures, and unnecessary scour protection engineering costs.
Text
Mohr et al - Depth-dependent erosion characteristics of marine sediments
- Accepted Manuscript
More information
Accepted/In Press date: 15 May 2021
e-pub ahead of print date: 21 June 2021
Published date: August 2021
Additional Information:
Funding Information:
This research was conducted by the Wave Energy Research Centre and jointly funded by The University of Western Australia and the Western Australian Government, via the Department of Primary Industries and Regional Development (DPIRD). The work was also partly supported by the UK’s EPSRC Offshore Renewable Energy Supergen Hub (grant EP/S000747/1).
Publisher Copyright:
© 2021 Elsevier Ltd
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
Keywords:
Erosion rate, Erosion threshold, Marine sediments, Portable erosion flume, Scour prediction, Subsea pipelines
Identifiers
Local EPrints ID: 450712
URI: http://eprints.soton.ac.uk/id/eprint/450712
ISSN: 0141-1187
PURE UUID: da2ff89e-5dc7-4789-be6e-de1176b06831
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Date deposited: 09 Aug 2021 16:30
Last modified: 18 Mar 2024 05:27
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Contributors
Author:
Henning Mohr
Author:
Samuel A. Stanier
Author:
Matthew Kuo
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