Temporal scales for live-bed scour at abutments

Ballio, Francesco ; Radice, Alessio ; Dey, Subhasish (2010) Temporal scales for live-bed scour at abutments Journal of Hydraulic Engineering, 136 (7). pp. 395-402. ISSN 0733-9429

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Official URL: http://ascelibrary.org/hyo/resource/1/jhend8/v136/...

Related URL: http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000191


Live-bed scour at a vertical-wall abutment is experimentally investigated with specific attention paid to the conceptual issues concerning the temporal development of local scour phenomenon. First explored are the time scales for the initial rising phase of the time variation of scour depth. An appropriate identification of such scales and of their normalizing parameters makes it possible to recognize a quantitative dependency of nondimensional time scales on flow intensity. Second, the time scales for the subsequent fluctuations around a mean equilibrium value are considered. Experimental results indicate that the quasiperiodical fluctuations of scour depths do not always correspond to those of bed forms. A conceptual model is outlined to explain this aspect.

Item Type:Article
Source:Copyright of this article belongs to American Society of Civil Engineers.
Keywords:Bridge Abutments; Erosion; Scour; Sediment Transport; Sediment Loads; Time Dependence; Open Channel Flow
ID Code:78812
Deposited On:23 Jan 2012 04:02
Last Modified:23 Jan 2012 04:02

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