Abrasion prediction at Asahi sediment bypass tunnel based on Ishibashi's formula
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Date
2018
Publication Type
Journal Article
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yes
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Abstract
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.
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published
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Journal / series
Volume
6 (2)
Pages / Article No.
125 - 138
Publisher
Taylor & Francis
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Edition / version
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Date collected
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Subject
Abrasion; Field data; Sediment bypass tunnel; Sediment transport; Supercritical flow
Organisational unit
03820 - Boes, Robert / Boes, Robert