@inproceedings{AuelHagemannAlbayraketal.2015,
  author    = {Auel, C. and Hagemann, M. and Albayrak, I. and Boes, R.M.},
  title     = {Optimizing the sustainability of sediment bypass tunnels to counter reservoir sedimentation},
  series = {Proc. 25th ICOLD Congress, Q99 R31, Stavanger, Norway},
  booktitle = {Proc. 25th ICOLD Congress, Q99 R31, Stavanger, Norway},
  publisher = {ICOLD},
  doi       = {10.25974/fhms-15151},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151518},
  pages     = {431 -- 452},
  year      = {2015},
  abstract  = {In order to prevent reservoir sedimentation, sediment bypass tunnels can be an efficient countermeasure restoring sediment continuity of impounded rivers. Although supercritical open channel flow conditions in these tunnelsprevent tun-nel blockage, in combination with the high bypassed sediment volume it may lead tosevere abrasion damages on inverts. Consequently,wear termed hydroabra-sionoccurs. Based on laboratoryexperiments, a theoretical model was devel-oped to predict abrasion rates and service life timeof sediment bypass tunnels. Insituexperiments are further conducted for model calibration to provide an abrasion prediction approach for field applications.Finally,recommendations concerning the hydraulic design of the tunnel as well as the structural design ofthe invertareprovided.},
  language  = {en}
}
@inproceedings{AuelAlbayrakSumietal.2015,
  author    = {Auel, C. and Albayrak, I. and Sumi, T. and Boes, R.M.},
  title     = {Saltation-abrasion model for hydraulic structures},
  series = {Proc. 1st Int. Workshop on Sediment Bypass Tunnels, VAW Mitteilungen 232},
  booktitle = {Proc. 1st Int. Workshop on Sediment Bypass Tunnels, VAW Mitteilungen 232},
  publisher = {ETH Zurich},
  doi       = {10.25974/fhms-15152},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151528},
  pages     = {101 -- 121},
  year      = {2015},
  abstract  = {The derivation of an abrasion prediction model for concrete hydraulic structures valid in supercritical flows is presented herein. The state of the art saltation-abrasion model from Sklar and Dietrich (2004) is modified using the findings of a recent research pro-ject on the design and layout of sediment bypass tunnels. The model correlates the im-pacting parameters with the invert material properties by an abrasion coefficient kv. The value of this coefficient is verified by a similarity analysis to bedrock abrasion in river systems applying a correlation between the abrasion rate and the bed material strength. A sensitivity analysis reveals that the saltation-abrasion model is highly dependent on an adequate estimation of kv. However, as a first order estimate the proposed model en-ables the practical engineer to estimate abrasion at hydraulic structures prone to super-critical flows.},
  language  = {en}
}
@inproceedings{AuelBoesSumi2015,
  author    = {Auel, C. and Boes, R.M. and Sumi, T.},
  title     = {Abrasion damage estimation of sediment bypass tunnels: Validation and comparison of two prediction models},
  series = {Annuals of Disaster Prevention Research Institute 58B, Kyoto University, Japan},
  booktitle = {Annuals of Disaster Prevention Research Institute 58B, Kyoto University, Japan},
  publisher = {Kyoto University},
  doi       = {10.25974/fhms-15154},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151547},
  pages     = {540 -- 549},
  year      = {2015},
  abstract  = {Abrasion damage estimation of sediment bypass tunnels: Validation and comparison of two prediction models. Annuals of Disaster Prevention Research Institute 58B, Kyoto Univer-sity, Japan},
  language  = {en}
}
@inproceedings{AuelAlbayrakBoes2015,
  author    = {Auel, C. and Albayrak, I. and Boes, R.M.},
  title     = {Bed-load particle motion in supercritical open channel flows},
  series = {Proc. 36th IAHR World Congress, Delft - The Hague, the Netherlands},
  booktitle = {Proc. 36th IAHR World Congress, Delft - The Hague, the Netherlands},
  publisher = {IAHR},
  doi       = {10.25974/fhms-15155},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151559},
  year      = {2015},
  abstract  = {Supercritical sediment-laden open channel flows occur in many hydraulic structures including dam outlets, weirs, and bypass tunnels. Due to high flow velocities and sediment flux severe problems such as erosion and abrasion damages are expected in these structures (Jacobs et al., 2001). Sediment bypass tunnels (SBT), as an effective measure to decrease reservoir sedimentation by bypassing sediments during floods, are exceptionally prone to high abrasion causing significant annual maintenance cost (Sumi et al., 2004; Auel and Boes, 2011). The Laboratory of Hydraulics, Hydrology and Glaciology (VAW) of ETH Zurich conducted a laboratory study to counteract these negative effects (Auel, 2014). The main goals of the project were to analyze the fundamental physical processes in supercritical flows as present in SBTs by investigating the mean and turbulence flow characteristics (Auel et al., 2014a), particle motion (Auel et al., 2014b; 2015b), and abrasion development caused by transported sediment. Besides new insights into the three listed topics, paramount interest is given to their inter-relations and the development of an easily applicable abrasion prediction model (Auel et al., 2015a). This paper presents selected results on the second topic, i.e. the analysis of saltation trajectories of single coarse particles in supercritical flow.},
  language  = {en}
}