The hydrodynamic behaviour of the floating woody debris is analysed in relation to trapping efficiency of an open check dam. Physical model tests have been carried out in a flume consisting of three sub-reaches with different slope: a log feeding zone, a transfer reach, a detention zone upstream of the check dam openings. The change of flow regime from supercritical to subcritical has proved to play an important role for the redistribution of the entering wood discharge. Further experiments concern the relation between log trap efficiency and inclination and openings of the check dam filter. A dimensionless variable is proposed to assess the experimental measurements and to provide a design criterion for the grid openings.
Experimental investigation on open check dam for coarse woody debris control
D'AGOSTINO, VINCENZO;DEGETTO, MASSIMO;
2000
Abstract
The hydrodynamic behaviour of the floating woody debris is analysed in relation to trapping efficiency of an open check dam. Physical model tests have been carried out in a flume consisting of three sub-reaches with different slope: a log feeding zone, a transfer reach, a detention zone upstream of the check dam openings. The change of flow regime from supercritical to subcritical has proved to play an important role for the redistribution of the entering wood discharge. Further experiments concern the relation between log trap efficiency and inclination and openings of the check dam filter. A dimensionless variable is proposed to assess the experimental measurements and to provide a design criterion for the grid openings.Pubblicazioni consigliate
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