@inproceedings{AuelTheneCarrolletal.2018,
  author    = {Auel, C. and Thene, J.R. and Carroll, J. and Holmes, C. and Boes, R.M.},
  title     = {Rehabilitation of the Mud Mountain bypass tunnel invert},
  series = {VINGT SIXI{\`E}ME CONGR{\`E}S DES GRANDS BARRAGES Vienne, Juillet 2018},
  booktitle = {VINGT SIXI{\`E}ME CONGR{\`E}S DES GRANDS BARRAGES Vienne, Juillet 2018},
  publisher = {COMMISSION INTERNATIONALE DES GRANDES BARRAGES},
  doi       = {10.25974/fhms-15141},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151413},
  year      = {2018},
  abstract  = {This paper describes the design of the new tunnel invert lining of the 9-foot tunnel at Mud Mountain Dam, Washington, USA. The tunnel diverts all bed load sediments into the tailwater. Major invert abrasion has been observed in the existing steel lining. The new invert design consists of 0.59 m2 and 0.79 m2 granite blocks that are 0.25 m thick and placed tightly together along the tunnel. Stability analysis showed factors of safety ranging from 1.2 to 2.6 against uplift. This will be achieved with strip drains placed in the bedding material along the tunnel. A service-design-life analysis was performed using abrasion prediction modelling. This model was based on abrasion measurement data acquired from granite field tests at Pfaffensprung sediment bypass tunnel, Switzerland. The estimated annual abrasion depths for the granite were approximately 0.50 mm/year for average sediment transport conditions.},
  language  = {en}
}
@inproceedings{Auel2018,
  author    = {Auel, C.},
  title     = {Sediment bypassing, a sustainable and co-friendly strategy against reservoir sedimentation},
  series = {VINGT SIXI{\`E}ME CONGR{\`E}S DES GRANDS BARRAGES Vienne, Juillet 2018},
  booktitle = {VINGT SIXI{\`E}ME CONGR{\`E}S DES GRANDS BARRAGES Vienne, Juillet 2018},
  publisher = {COMMISSION INTERNATIONALE DES GRANDES BARRAGES},
  doi       = {10.25974/fhms-15140},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151407},
  year      = {2018},
  abstract  = {Without adequate measures, reservoirs are not sustainable, neither the reservoir itself due to continuous sedimentation, nor the downstream ecosystem due to altered sediment continuity. Appropriate actions are inevitable and require a systematic sedimentation management. Sediment bypassing constitutes one effective strategy that routes sediment load around reservoirs during floods. A sediment bypass system has the advantage that only newly entrained sediment is diverted from the upstream to the downstream reach thereby re-establishing sediment connectivity. Hence, such a system contributes to a sustainable water resources management while taking the downstream environment into consideration. This paper gives a state-of-the-art overview encompassing design, bypass efficiency, hydraulics, challenges due to abrasion, positive effects on both downstream morphology and ecology, and makes design recommendations.},
  language  = {en}
}
@inproceedings{BoesHagemannMuellerAlbaryaketal.2018,
  author    = {Boes, R.M. and Hagemann-M{\"u}ller, M. and Albaryak, I. and M{\"u}ller, B. and Caspescha, L. and Flepp, A. and Jacobs, F. and Auel, C.},
  title     = {Sediment bypass tunnels: Swiss experiences with bypass efficiency and abrasion-resistant invert materials},
  series = {VINGT SIXI{\`E}ME CONGR{\`E}S DES GRANDS BARRAGES, Vienne, Juillet 2018},
  booktitle = {VINGT SIXI{\`E}ME CONGR{\`E}S DES GRANDS BARRAGES, Vienne, Juillet 2018},
  publisher = {COMMISSION INTERNATIONALE DES GRANDES BARRAGES},
  doi       = {10.25974/fhms-15139},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-151399},
  year      = {2018},
  abstract  = {In this paper typical bypass efficiencies of sediment bypass tunnels (SBTs) used to counter reservoir sedimentation are described, distinguishing between two layouts of the tunnel intake. It results that SBTs are an effective measure to reduce the sedimentation of dam reservoirs, particularly of type (A) with intake at the reservoir head. The hydroabrasive wear of tunnel inverts is significant and has to be mitigated by using adequate invert liners. The invert abrasion can be estimated based on an abrasion model where a correct input value of the bed material resistance coefficient is paramount to limit model uncertainties. Based on abrasion measurements at prototype SBTs typical values of the material resistance coefficient are recommended for high-strength concrete, natural stones and steel liners. The field experiences gathered so far and the comparison of various invert materials suggest granite pavers as a promising lining material for severe abrasion conditions.},
  language  = {en}
}