@inproceedings{AuelAlbayrakBoes2014,
  author    = {Auel, C. and Albayrak, I. and Boes, R.M.},
  title     = {Bedload particle velocity in supercritical open channel flows},
  series = {Proc. 7th River Flow, Int. Conference on Fluvial Hydraulics (Schleiss et al. eds.)},
  booktitle = {Proc. 7th River Flow, Int. Conference on Fluvial Hydraulics (Schleiss et al. eds.)},
  publisher = {Taylor and Francis},
  isbn      = {978-1-138-02674-2},
  doi       = {10.25974/fhms-15157},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151579},
  pages     = {923 -- 931},
  year      = {2014},
  abstract  = {Single glass sphere motion recordings were conducted in a transitional-rough bed open channel at steady and highly supercritical flow similar to hydraulic conditions in sediment bypass tunnels. A high speed camera with a maximum resolution of 2,560 × 2,160 pixels was used to record the movement of bedload particles with diameters of D = 5.3, 10.3 and 17.5 mm. An in-house developed Particle Tracking Velocimetry (PTV) program was used to determine the transport mode and velocities of each particle for a wide range of Froude numbers up to Fo = 6. The relative roughness defined as the ratio of the bed roughness height ks to the water depth h varied from ks/h = 0.02-0.03. Particles were observed to move in rolling and saltation modes depending on the Shields number. The particle velocity shows a linearly increasing relationship with both friction velocity and Froude number nearly independent on the particle diameter. A linear relationship was also found between rolling and saltating particle velocities indicating that particle velocity does not depend on the transport mode in the range of the investigated hydraulic conditions. Scaling of particle velocity with the wave celerity plotted as a function of the Froude number adequately merged external data sets with the present data. As a consequence, a linear fit for a large Froude number range was obtained.},
  language  = {en}
}
@inproceedings{BoesAuelHagemannetal.2014,
  author    = {Boes, R.M. and Auel, C. and Hagemann, M. and Albayrak, I.},
  title     = {Sediment bypass tunnels to mitigate reservoir sedimentation and restore sediment continuity},
  series = {Reservoir Sedimentation},
  booktitle = {Reservoir Sedimentation},
  publisher = {Taylor and Francis Group},
  address   = {London, UK},
  isbn      = {978-1-138-02675-9},
  doi       = {10.25974/fhms-15156},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151569},
  pages     = {221 -- 228},
  year      = {2014},
  abstract  = {Worldwide, a large number of reservoirs impounded by dams are rapidly filling up with sediments. As on a global level the loss of reservoir volume due to sedimentation increases faster than the creation of new storage volume, the sustainability of reservoirs may be questioned if no countermeasures are taken. This paper gives an overview of the amount and the processes of reservoir sedimentation and its impact on dams and reservoirs. Furthermore, sediment bypass tunnels as a countermeasure for small to medium sized reservoirs are discussed with their pros and cons. The issue of hydroabrasion is highlighted, and the main design features to be applied for sediment bypass tunnels are given.},
  language  = {en}
}