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Probabilistic description of grain resistance from simultaneous flow field and grain motion measurements
Univ Padua, Dept Hydraul Maritime Environm & Geotech Engn.
Univ Bradford, Sch Engn Design & Technol.
Univ Padua, Dept Hydraul Maritime Environm & Geotech Engn.
Univ Guilan, Dept Civil Engn, Fac Engn.
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2008 (English)In: Water resources research, ISSN 0043-1397, E-ISSN 1944-7973, Vol. 44, no 9, W09419- p.Article in journal (Refereed) Published
Abstract [en]

Experiments were carried out using a mobile gravel bed placed in a tilting flume with a modified particle image velocimetry (PIV) system. Individual grain movements were surveyed using data from time series of images. Near-bed velocity flow field measurements were made simultaneously above the same area of the sediment surface by applying cross-correlation techniques to the collected plan view images. Statistics of grain motions were collected through a semiautomatic procedure. Significant changes in the flow field were observed in the proximity of the entrained or deposited particles. A strong correlation is shown between the changes in the local streamwise and lateral velocity and the movement of the grains. The theory of Grass is revisited and developed based on the experimental results. The probability distribution of individual grain resistance has been derived from the statistics of the near-bed velocity field and of the entrainment risk.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2008. Vol. 44, no 9, W09419- p.
National Category
Ocean and River Engineering
Identifiers
URN: urn:nbn:se:kth:diva-80490DOI: 10.1029/2007WR006224ISI: 000259206200002OAI: oai:DiVA.org:kth-80490DiVA: diva2:496425
Note
QC 20120215Available from: 2012-02-15 Created: 2012-02-09 Last updated: 2017-12-07Bibliographically approved

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