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Publikācija: Scour Duration at Structures at Steady Flow Conditions

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Nosaukums oriģinālvalodā Scour Duration at Structures at Steady Flow Conditions
Pētniecības nozare 1. Dabaszinātnes
Pētniecības apakšnozare 1.5. Zemes zinātnes, fiziskā ģeogrāfija un vides zinātnes
Autori Oskars Lauva
Boriss Gjunsburgs
Atslēgas vārdi local scour, equilibrium time, contraction rate of the flow.
Anotācija One of the reasons of the bridge crossings failure or damage in flow is the unpredicted depth of scour near foundations. The aim of this study is to find the equilibrium time near elliptical guide banks. Analysis of the literature shows that there are no methods or formulas to calculate equilibrium time of scour near elliptical guide banks. In the formulas used in calculating equilibrium time at piers or abutments, different parameters are not taken into consideration. These parameters include: contraction rate of the flow, Froude number, bed layering, sediment movement parameters, local flow modification, ratio relative local and critical velocities, and relative depth. The differential equation of the bed sediment movement in clear water was used and method for computing equilibrium time of scour near elliptical guide banks was elaborated. New hydraulic threshold criterion is proposed for the calculation of equilibrium time of scour. Computer modeling results were compared with equilibrium time of scour which were calculated by the presented method and they were in agreement.
DOI: 10.15544/RD.2015.001
Hipersaite: http://conf.rd.asu.lt/index.php/rd/article/view/9 
Atsauce Lauva, O., Gjunsburgs, B. Scour Duration at Structures at Steady Flow Conditions. No: Proceedings of the 7th International Scientific Conference "Rural Development 2015: Towards the Transfer of Knowledge, Innovations and Social Progress", Lietuva, Kaunas, 19.-20. novembris, 2015. Kaunas: Aleksandras Stulginskis University, 2015, 1.-6.lpp. e-ISBN 978-609-449-092-7. ISSN 1822-3230. e-ISSN 2345-0916. Pieejams: doi:10.15544/RD.2015.001
ID 23073