1D numerical modelling of Sediment-Bypass-Tunnel operation in a narrow reservoir.
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Date
2023
Publication Type
Conference Paper
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yes
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Abstract
Sustainable operation of many hydropower reservoirs is impacted by reservoir sedimentation which is not only causing a reduction of storage capacity but may also impair the functionality of dam outlets thereby implicating dam safety issues. Sediment Bypass Tunnels (SBTs) represent an effective countermeasure to mitigate sedimentation problems as they allow for bypassing incoming sediment (bedload and parts of the suspended load) around the dam into the tailwater reach. This study considers the Solis reservoir (Switzerland) which has effectively implemented an SBT with intake within the reservoir (type-B SBT) for managing high sediment inflow. The aim is to evaluate the performance of the Solis SBT by conducting 1D numerical simulations. The results show that a 1D model can closely reproduce the processes of sedimentation and SBT operation. Furthermore, the effect of the reservoir water level on SBT efficiency is assessed by conducting a scenario simulation. We found that the reservoir water level has a major impact on the SBT efficiency. For type-B SBTs, synchronous lowering of water level is recommended during SBT operation to ensure effective sediment bypassing.
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Publication status
published
Book title
Proceedings of the 40th IAHR World Congress
Journal / series
Volume
Pages / Article No.
2842 - 2847
Publisher
International Association for Hydro-Environment Engineering and Research
Event
40th IAHR World Congress: Rivers - Connecting Mountains and Coasts
Edition / version
Methods
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Date collected
Date created
Subject
Reservoir sedimentation; Sediment-Bypass-Tunnel; Numerical modelling
Organisational unit
03820 - Boes, Robert / Boes, Robert
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