Fluvial Hydraulics of Mountain Regions by Aronne Armanini, Giampaolo Di Silvio

By Aronne Armanini, Giampaolo Di Silvio

These complaints of the overseas Workshop of Fluvial Hydraulics of Mountain quarter (Trent, October 1989) might be considered as the state of the art on water circulation and sediment shipping in mountain rivers. the focal point is on: - Hydrodynamics of steep rivers; - Sediment move and sediment regulate; - specific positive aspects on sediment delivery appropriate to non-uniform grain-size.

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Hence, u--sv-'s is always negative, and <~'sVs > becomes negative. It means the suppression o f the measured Reynolds stress (), because must be balanced with the gravity. The vertical component of flow, vs, exists only the vicinity o f the roughness elements, and it might have a maximum near the bed because it might be brought about by eddy-sheddings from individual roughness elements. Hence, the decrease of the Reynolds stress takes place only in the roughness sublayer, and the distribution of the Reynolds stress through the flow depth falls rather a convex profile independently of the measuring points.

According to the results, ~he wave length is determined at an initial stage during active sediment movement, which emphasizes that the step-pool topography is not only caused by antidunes but also, as shown by Whittaker and Jaeggi, its wave length can be determined by these. With respect to the wave height, it may increase gradually to a statical equilibrium if sediment sorting or armoring phenomenon continues. It should be noted that step-pool topography cannot be produced, so long as using the uniform sand grains.

Ass. Hydr. , Melbourne, Australia. , and Suszka, L. , Jap. Soc. Civ. , J. Hydroscie. and Hydr. 1. O. (1975); "Turbulence", McGraw Hill Book Company, New York. H. (1938); "Laws of Turbulent flow in Open Channels"; J. Res. Nat. S. Dept. 21, pp. 707 741. Nezu, L and W. , Am. Soc. Civ. , J. 335-355. A. (1974); "Turbulent Flows In Engineering"; John Wiley & Sons Ltd, London. 32 Shields, A. , PVWES, Berlin, no. 26. Suszka,L. (1987); "Sediment transport at Steady and Unsteady Flow; a Laboratory Study", doctoral dissertation, No.

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