Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6368
AuthorsCagnoli, B.* 
Romano, G.* 
TitleEffect of grain size on mobility of dry granular flows of angular rock fragments: An experimental determination
Issue Date25-Mar-2010
Series/Report no./193 (2010)
DOI10.1016/j.jvolgeores.2010.03.003
URIhttp://hdl.handle.net/2122/6368
Keywordsrock avalanches
mobility
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.02. Experimental volcanism 
AbstractRapid mass movement of rock fragments are among the most hazardous natural phenomena. They are too dangerous to be approached and studied directly and, for this reason, experiments are necessary to understand their flow mechanisms. Here, we present the results of experiments on granular flow mobility obtained releasing batches of angular rock fragments down a curved chute. Our experiments demonstrate that the finer the grain size of the flow, the larger its mobility. This is accompanied by a decrease of fragments agitation when grain size decreases as shown by particle image velocimetry measurements of high-speed video camera images. The smaller the agitation, the smaller is also the energy dissipated by flows per unit of travel distance. This explains the effect of finer grain size on flow mobility. These results are an important step towards the prediction of runout distances as a function of the features that characterize the different geophysical flows.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Cagnoli Romano 2010a.pdfarticle1.63 MBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

62
checked on Apr 24, 2017

Download(s)

17
checked on Apr 24, 2017

Google ScholarTM

Check

Altmetric