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dc.contributor.authorliu, Wenjun
dc.contributor.authorWang, Bo
dc.contributor.authorGuo, Yakun
dc.contributor.authorZhang, Jianmin
dc.contributor.authorChen, Yunliang
dc.date.accessioned2020-08-14T11:10:01Z
dc.date.available2020-08-14T11:10:01Z
dc.date.issued2020-11
dc.identifier.citationliu W, Wang B, Guo Y et al (2020) Experimental investigation on the effects of bed slope and tailwater on dam-break flows. Journal of Hydrology. 590: 125256.en_US
dc.identifier.urihttp://hdl.handle.net/10454/17963
dc.descriptionYesen_US
dc.description.abstractUnderstanding of the characteristics of dam-break flows moving along a sloping wet bed can help to timely issue flood warning and risk mitigation. In this study, laboratory experiments are carried out in a large flume for a wide range of upstream water depth, bed slopes and tailwater depth. The water level is recorded and processed to calculate the mean velocity and wave celerity. Results show that the increase of the bed slope will significantly accelerate the wave-front celerity for the downstream dry bed, while the negative wave celerity will decrease. When water depth ratio α ≥ 0.3 (defined as the ratio of initial downstream water depth over the upstream water depth of dam), there are extra negative waves propagating towards the reservoir area after the flow has developed for a period of time. When α ≥ 0.6, there are the Favre waves propagating downstream. The water level and the mean velocity fluctuate due to the influence of the extra negative waves and the Favre waves. Such fluctuant frequency increases with the increase of the water depth ratio. The empirical formulas are obtained for the celerity of the first extra negative wave and the first downstream wave. The variation of wave-front height is very similar under three bed slopes investigated in this study, while the maximum wave-front height occurs when α = 0.2. The present study broadens the understanding of the effects of the bed slope and the tailwater level on the movement of the dam-break flows. Furthermore, experimental results are also compared with some analytical solutions. The validity of the assumptions made during the development of these analytical solutions and their limitations are discussed by comparing with the experimental measurements.en_US
dc.description.sponsorshipThe National Natural Science Foundation of China (Grant No: 51879179), the Open Fund from the State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University (SKHL1809) and Sichuan Science and Technology Program (No. 2019JDTD0007).en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://doi.org/10.1016/j.jhydrol.2020.125256en_US
dc.rights© 2020 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.en_US
dc.subjectDam-break flowen_US
dc.subjectBed slopeen_US
dc.subjectWater depth ratioen_US
dc.subjectWater levelen_US
dc.subjectWave celerityen_US
dc.subjectDigital image processingen_US
dc.titleExperimental investigation on the effects of bed slope and tailwater on dam-break flowsen_US
dc.status.refereedYesen_US
dc.date.Accepted2020-06-26
dc.date.application2020-07-03
dc.typeArticleen_US
dc.date.EndofEmbargo2021-07-04
dc.type.versionAccepted manuscripten_US
dc.description.publicnotesThe full-text of this article will be released for public view at the end of the publisher embargo on 4th Jul 2021.en_US
refterms.dateFOA2020-08-14T11:10:33Z


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