IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Protected stilling basins downstream of low-head river training structures: energy dissipation
Protected stilling basins downstream of low-head river training structures: energy dissipation
Low-environment impact structures have become very popular in the last decades. They are widely used in river
restoration both to control sediment transport and, at the same time, to create optimal conditions for fish species. They
generally improve water quality due to higher oxygenation. Nevertheless, these are complex structures which require a
particular attention to the effects of their presence on the local eco-system. Among this structure typology, block ramps
are probably the most common. They are characterized by a quite complex flow regime and by significant erosive
processes occurring downstream of them. Therefore, the knowledge of hydraulic characteristics is a fundamental aspect
for a correct functioning of the structure. In particular, the downstream stilling basin morphology strongly depends on
both hydraulic and geometric parameters. Namely, the stilling basin geometry has to be carefully analyzed in order to
prevent structural collapse and to create opportune pools where fishes can find an optimal natural habitat. This paper
focuses on energy dissipation process occurring in correspondence with block ramps and downstream stilling basins.
The analysis of the dissipative phenomenon is conducted in the presence of protection structures (sills) located in the
stilling basin in order to minimize scour characteristics. Two stilling basin configurations were compared: prismatic
configuration having the same width of the ramp and symmetrically enlarged configuration. The energy dissipation for
both the tested configurations was analyzed and discussed emphasizing the effect of spatial positions of the sills on it.
File Size : 2,427,289 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 28/08/2015
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