Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Free Surface Slopes at Controls in Channel Flow
It is commonly held that the slope of a free water surface in steady open channel flow is indeterminate at a control section. It is shown that the surface slope is finite and, subject to certain approximations, determinate. Expressions are derived for the surface slopes of critical flows over a smooth weir and through a smooth contraction. Experiments confirmed the validity of these expressions up to the surface slopes of tan-¹0.3 for weirs and tan -¹0.8 for contractions. It is shown that the same expressions could have been obtained using the one-dimensional energy equation, even though the assumption of hydrostatic pressure is not valid. The expression derived for the water surface slope yields a well-conditioned equation for numerical calculation of water surface profiles through a control. The possibility of using surface slope at a control section as a rating parameter is mentioned.
Free Surface Slopes at Controls in Channel Flow
It is commonly held that the slope of a free water surface in steady open channel flow is indeterminate at a control section. It is shown that the surface slope is finite and, subject to certain approximations, determinate. Expressions are derived for the surface slopes of critical flows over a smooth weir and through a smooth contraction. Experiments confirmed the validity of these expressions up to the surface slopes of tan-¹0.3 for weirs and tan -¹0.8 for contractions. It is shown that the same expressions could have been obtained using the one-dimensional energy equation, even though the assumption of hydrostatic pressure is not valid. The expression derived for the water surface slope yields a well-conditioned equation for numerical calculation of water surface profiles through a control. The possibility of using surface slope at a control section as a rating parameter is mentioned.
Free Surface Slopes at Controls in Channel Flow
Wilkinson, David L. (Autor:in)
Journal of the Hydraulics Division ; 100 ; 1107-1117
01.01.2021
111974-01-01 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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