Soulsby, R.L. (2012) Threshold of motion of bimodal sand sizes in the SandTrack model. A new hiding/exposure function. Technical Report. HR Wallingford, Wallingford, UK.
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The report describes the development of a new hiding/exposure function for determining the threshold of motion of ‘tagged’ grains in the SandTrack particle tracking model. It applies to a bimodal (or more strictly binary) grain-size distribution in which the tagged grains are a different size to the underlying (uniform) indigenous sand bed. The new function was presented in a paper by Soulsby et al. (2011, Eq 16), but the derivation was not given there due to length restrictions. The method is deliberately kept simple, and is expressed as a function purely of the ratio of the diameters of the tagged grain and the indigenous bed grains. Comparisons are presented of the new formula and previous methods, and the formula is found to agree well with more elaborate models in the range of diameters modelled by Soulsby et al. (2011), as well as with published data. For tagged grains smaller than the indigenous grains, the behaviour of this binary case is different to the more commonly considered case of a continuously-graded sediment. A step by step guide to application of the method in models is given in the Conclusions. This report was referenced by Soulsby et al. (2011) as HR Wallingford Report TR190 (Soulsby, 2010). Due to a change in the internal system, the correct citation is: Soulsby, R.L. (2012). Threshold of motion of bimodal sand sizes in the SandTrack model: a new hiding/exposure function (Report TR190). Report DEK2138-RT001-R01-00, HR Wallingford.
| Item Type: | Monograph (Technical Report) |
|---|---|
| Additional Information: | A PDF of this report is available on request. Please contact HR Wallingford. |
| Uncontrolled Keywords: | Report No: DEK2138-RT001-R01-00 (TR190) |
| Subjects: | Coasts > General |
| Divisions: | Coastal |
| Depositing User: | Helen Stevenson |
| Date Deposited: | 31 Jan 2024 15:44 |
| Last Modified: | 31 Jan 2024 15:47 |
| URI: | http://eprints.hrwallingford.com/id/eprint/1611 |
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