TY  - CHAP
A1  - Müller-Hagemann, M.
A1  - Auel, C.
A1  - Albaryak, I.
A1  - Boes, R.M.
T1  - Bedload transport and hydro-abrasive erosion at steep bedrock rivers and hydraulic structures
T2  - Riverflow, Lyon, France
Y1  - 2018
ER  - 
TY  - JOUR
A1  - Auel, C.
A1  - Boes, R.M.
A1  - Sumi, T.
T1  - Abrasion prediction at Asahi sediment bypass tunnel based on Ishibashi’s formula
JF  - Journal of Applied Water Engineering and Research
N2  - Abrasion in a concrete-lined sediment bypass tunnel is estimated using a Japanese state-of-the-art prediction model and validated by measured invert abrasion data at Asahi Reservoir, Japan. The model is described in detail, certain shortcomings are disclosed, and a revised version is proposed. The model consists of a kinetic energy term accounting for the impact by saltating particles, and a friction work term accounting for the grinding stress. It is found that the latter term yields concrete abrasion values being consistently a multiple compared to its kinetic term contradicting other research. Based on that, and a possible particle impact angle inconsistency, it is proposed to omit the friction work term. It is shown that the calculated abrasion is overestimated by 138% on average compared with that measured, if both terms are accounted for. However, promising results are obtained with only 30% overestimation by neglecting the friction work term.
Y1  - 2018
U6  - http://dx.doi.org/10.1080/23249676.2016.1265470
SP  - 125
EP  - 138
ER  - 
TY  - CHAP
A1  - Auel, C.
A1  - Thene, J.R.
A1  - Carroll, J.
A1  - Holmes, C.
A1  - Boes, R.M.
T1  - Rehabilitation of the Mud Mountain bypass tunnel invert
T2  - VINGT SIXIÈME CONGRÈS DES GRANDS BARRAGES Vienne, Juillet 2018
N2  - 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.
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-151413
PB  - COMMISSION INTERNATIONALE DES GRANDES BARRAGES
ER  - 
TY  - CHAP
A1  - Boes, R.M.
A1  - Hagemann-Müller, M.
A1  - Albaryak, I.
A1  - Müller, B.
A1  - Caspescha, L.
A1  - Flepp, A.
A1  - Jacobs, F.
A1  - Auel, C.
T1  - Sediment bypass tunnels: Swiss experiences with bypass efficiency and abrasion-resistant invert materials
T2  - VINGT SIXIÈME CONGRÈS DES GRANDS BARRAGES, Vienne, Juillet 2018
N2  - 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.
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-151399
PB  - COMMISSION INTERNATIONALE DES GRANDES BARRAGES
ER  -