Abrasion prediction at Asahi sediment bypass tunnel based on Ishibashi's formula. Issue 2 (3rd April 2018)

• Record Type: Journal Article
• Authors: Auel, Christian; Boes, Robert M.; Sumi, Tetsuya
• Is Part Of: Journal of applied water engineering and research. Volume 6:Issue 2(2018)
• Page Start: 125
• Page End: 138
• Publication Date: 2018-04-03
• Subjects: abrasion -- field data -- sediment bypass tunnel -- sediment transport -- supercritical flow; Water-supply engineering -- Periodicals; Water-supply engineering; Periodicals; 627.05
• DOI: 10.1080/23249676.2016.1265470
• Languages: English
• ISSNs: 2324-9676

Abstract

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.