Performance of a shallow-water model for simulating flow over trapezoidal broad-crested weirs
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F19%3APU135958" target="_blank" >RIV/00216305:26110/19:PU135958 - isvavai.cz</a>
Výsledek na webu
<a href="http://www.uh.sav.sk/jhh/Find-Issues/All-Issues?kod=67,4" target="_blank" >http://www.uh.sav.sk/jhh/Find-Issues/All-Issues?kod=67,4</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2478/johh-2019-0014" target="_blank" >10.2478/johh-2019-0014</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Performance of a shallow-water model for simulating flow over trapezoidal broad-crested weirs
Popis výsledku v původním jazyce
Shallow-water models are standard for simulating flow in river systems during floods, including in the nearfield of sudden changes in the topography, where vertical flow contraction occurs such as in case of channel overbanking, side spillways or levee overtopping. In the case of stagnant inundation and for frontal flow, the flow configurations are close to the flow over a broad-crested weir with the trapezoidal profile in the flow direction (i.e. inclined upstream and downstream slopes). In this study, results of shallow-water numerical modelling were compared with seven sets of previous experimental observations of flow over a frontal broad-crested weir, to assess the effect of vertical contraction and surface roughness on the accuracy of the computational results. Three different upstream slopes of the broad-crested weir (V:H = 1:Z(1) = 1:1, 1:2, 1:3) and three roughness scenarios were tested. The results indicate that, for smooth surface, numerical simulations overestimate by about 2 to 5% the weir discharge coefficient. In case of a rough surface, the difference between computations and observations reach up to 10%, for high relative roughness. When taking into account mentioned the differences, the shallow-water model may be applied for a range of engineering purposes.
Název v anglickém jazyce
Performance of a shallow-water model for simulating flow over trapezoidal broad-crested weirs
Popis výsledku anglicky
Shallow-water models are standard for simulating flow in river systems during floods, including in the nearfield of sudden changes in the topography, where vertical flow contraction occurs such as in case of channel overbanking, side spillways or levee overtopping. In the case of stagnant inundation and for frontal flow, the flow configurations are close to the flow over a broad-crested weir with the trapezoidal profile in the flow direction (i.e. inclined upstream and downstream slopes). In this study, results of shallow-water numerical modelling were compared with seven sets of previous experimental observations of flow over a frontal broad-crested weir, to assess the effect of vertical contraction and surface roughness on the accuracy of the computational results. Three different upstream slopes of the broad-crested weir (V:H = 1:Z(1) = 1:1, 1:2, 1:3) and three roughness scenarios were tested. The results indicate that, for smooth surface, numerical simulations overestimate by about 2 to 5% the weir discharge coefficient. In case of a rough surface, the difference between computations and observations reach up to 10%, for high relative roughness. When taking into account mentioned the differences, the shallow-water model may be applied for a range of engineering purposes.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10503 - Water resources
Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Journal of Hydrology and Hydromechanics
ISSN
0042-790X
e-ISSN
1338-4333
Svazek periodika
67
Číslo periodika v rámci svazku
4
Stát vydavatele periodika
SK - Slovenská republika
Počet stran výsledku
7
Strana od-do
322-328
Kód UT WoS článku
000497193600004
EID výsledku v databázi Scopus
2-s2.0-85076303124