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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Analysis of sediment transport processes during reservoir flushing using
Analysis of sediment transport processes during reservoir flushing using
Author : GABRIELE HARB(1), JOSEF SCHNEIDER (1) & GERALD ZENZ(1)
ABSTRACT
The deposition of sediments due to the reduced flow velocities, turbulences and bed shear stresses is a problem in many
reservoirs. In the case of Alpine reservoirs with a small storage volume compared to the annual inflow, such as
reservoirs of run-off river power plants, the water depth is usually lower than in reservoirs of storage and pump-storage
hydro power plants. A larger part of the suspended sediments is thus transported through the reservoir and deposition of
bed load fractions is the main problem. The deposition of coarse sediments at the head of the reservoir may cause
problems regarding flood protection by raising the bed level and thus, raising the water level too.
This study focus on the sediment transport processes during a flushing event in an Alpine reservoir. The reservoir was
built in 1981 and is approximately 4.5 km long with an initial storage volume of about 1.4 Mio. m3. However, echosoundings
performed in 2007 showed that approximately 890,000 m3 of sediments are already deposited in the
reservoir, which corresponds to an annual sedimentation rate of about 6.1%.
A flushing event was modelled using an open source one-dimensional and a three-dimensional numerical model. The
calibration of the hydrodynamic part of the models was done using ACDP measurements performed at the prototype.
Echo-soundings done before and after the flushing event were used to validate the morphological changes calculated by
the numerical models. Additionally, a sensitivity analysis was carried out and several sediment transport formulae were
tested.
File Size : 719,814 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 17/08/2015
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