Field investigation on macro-roughness characterization in mountain rivers

摘要

The macro-roughness characteristics obtained by field measurements are herein analyzed for mountain rivers. In this conditions flow resistance is deeply affected by geometrical and spatial characteristics of macro-roughness elements. The roughness geometry complexity makes difficult the evaluation of a representative roughness height. In the present paper a criterion for macro-roughness characterization based on bed surface surveys and photographs is proposed. Experimental data collected during field activities were satisfactory compared to data from laboratory investigations.