Erosion properties of mud beds deposited in laboratory settling columns
Lintern, D.G.; Sills, G.C.; Feates, N.; Roberts, W. (2002). Erosion properties of mud beds deposited in laboratory settling columns, in: Winterwerp, J.C. et al. (Ed.) Fine sediment dynamics in the marine environment. Proceedings in Marine Science, 5: pp. 343-357
In: Winterwerp, J.C.; Kranenburg, C. (Ed.) (2002). Fine sediment dynamics in the marine environment. Proceedings in Marine Science, 5. Elsevier: Amsterdam. ISBN 0-444-51136-9. XV, 713 pp., more
In: Proceedings in Marine Science. Elsevier: New York. ISSN 1568-2692; e-ISSN 2352-2860, more
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| Keyword |
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| Author keywords |
ISIS; COSINUS; erosion; consolidation; shear stress; Tamar; mud |
| Authors | | Top |
- Lintern, D.G.
- Sills, G.C.
- Feates, N.
- Roberts, W.
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| Abstract |
Work has been conducted at Oxford University using H.R. Wallingford's Instrument for measuring Shear stress In Situ (ISIS). The first several experiments show that the equipment is working well in a column setup. Each bed tested is initially eroded by a distinct critical shear stress, or erosion threshold, which may depend on the properties of the mud and the length of consolidation time. The beds seem to erode in a laminar fashion, until at a very high shear rate a large (2 to 3 cm) liquified section of the surface gives way. Contrary to what might be expected, the beds become less resistant to erosion as they mature. It is proposed that the development of a biochemical surface layer, often containing gas, and the feeding and soil reworking by marine worms contribute to this weakening over time. |
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