Excessive erosion of gravel bed rivers represents a hazard, which is often controlled by the construction of bed sills. Shape and volume of equilibrium local scour holes at bed sills in high-gradient streams were investigated by analyzing steady-flow experimental data. Scour profiles were normalized by scaling the depths and the longitudinal distance from the upstream sill with the maximum dimensions of the scour hole. Results exhibited a universal geometrical affinity of the scour. Geometrical similarity was also found to occur, but only in a limited range of physical conditions. Evidence on the scaling nature of the scour hole shapes have important implications on the prediction of the eroded volume. In turn, a correct evaluation of the eroded volume is necessary for the optimization of the design of the inter-sill distance. Prediction formulae are proposed which link the eroded volume to the geometrical, hydraulic and sediment properties.
Affinity and similarity of local scour holes at bed sills / Tregnaghi, M; Marion, A; Gaudio, Roberto. - In: WATER RESOURCES RESEARCH. - ISSN 0043-1397. - 43:11(2007), pp. W11417-01-W11417-11.
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|Titolo:||Affinity and similarity of local scour holes at bed sills|
|Data di pubblicazione:||2007|
|Citazione:||Affinity and similarity of local scour holes at bed sills / Tregnaghi, M; Marion, A; Gaudio, Roberto. - In: WATER RESOURCES RESEARCH. - ISSN 0043-1397. - 43:11(2007), pp. W11417-01-W11417-11.|
|Appare nelle tipologie:||1.1 Articolo in rivista|