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Stability of Completely Armoured Bed Streams

Author(s): Maurizio Lutterotti; Aronne Armanini

Linked Author(s): Aronne Armanini

Keywords: Incipient motion; Artificial armouring; Steep bed streams; Drag coefficient

Abstract: The results of an experimental analysis on the stability of an artificially armoured bed stream have been presented. In mountain stream restoration the stream is often artificially formed by boulders accurately disposed on the bed, especially when the torrents cross the villages on alluvial fans. The boulders, placed one by one, form a relatively smooth surface which reduces the flow resistance and, besides, pavement stability increases if the filter criterion is respected. Goal is to study the effect of reciprocal blockage among the boulders on the stability and the drag coefficient for densely packed bed elements. The experimental data are compared with the results of theoretical analysis based on Shields theory.


Year: 2005

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