Velocity modification at the bridge abutments because scour

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F19%3APU134757" target="_blank" >RIV/00216305:26110/19:PU134757 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1757-899X/660/1/012029/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/1757-899X/660/1/012029/pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1757-899X/660/1/012028" target="_blank" >10.1088/1757-899X/660/1/012028</a>

Result language
angličtina
Original language name
Velocity modification at the bridge abutments because scour
Original language description
At the corner of the abutment were streamline concentration, sharp water level drop and rapid increase of velocity. Formula for calculation local velocity at the abutments is elaborated. Local velocity is depending on open flow parameters, backwater value, rate of contraction by bridge crossings and depth of scour. Relative local flow modification at the bridge abutment at plain river bed, relative local and critical velocities changes during scour at steady and unsteady flow, uniform bed and at bed layering is studied. Comparison of the local velocity with approach flow and mean velocity under the bridge opening was made. The local velocity Vlt is reducing and the critical velocity V0t is increasing because of the scour within the time step at steady or at unsteady flow. When relative local velocity βV0t/Vlt becomes equal to one the scour stops. For unsteady flow local and critical velocities are different at any steps of hydrograph because of the increased flow discharge and the scour depth. Dependence of the relative local and critical velocities at steady and unsteady flow, development in time and because of the scour, impact layering of the river bed is presented in paper in Figures and compared with tests results
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
4th International Conference on Innovative Materials, Structures and Technologies (IMST 2019)
ISBN
—
ISSN
1757-8981
e-ISSN
—
Number of pages
8
Pages from-to
1-8
Publisher name
IOP Publishing
Place of publication
Riga, LV
Event location
Riga
Event date
Sep 25, 2019
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000562127800028

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