Free flow over a partially contracted thin-plate weir with a triangular notch ofangle 20.23° and zero weir height

Free flow over a partially contracted thin-plate weir with a triangular notch ofangle 20.23° and zero weir height

WoS Article

The paper explores flow characteristics in the case of free flow of clean water over a partially contracted thin-plate weir with a triangular notch of angle 20.23° and with zero weir height above the bottom of the approach channel ofrectangular cross-section at 5 approach channel widths and 7 heads. The description was based on the results from experimental research and numerical simulations. The numerical simulations allowed the description of the characteristics in parts of the flow where measurements were difficult to perform. The experimental research quantifies the validity of the numerical simulations and establish recommendations for construction of numerical models. The boundary between a partially contracted weir and a fully contracted weir was established by dimensionless approach channel width of the value 0.32, the flow characteristics (water surface, velocity) in the full range of the partially contracted weir (dimensionless approach channel width in range 0.32 ≤ BU* ≤ 1.00), and recommendations for the placement of a cross-section to measure water surface level for determine the heads (dimensionless distance −4 ≤ x* ≤ −2) were verified.

The paper explores flow characteristics in the case of free flow of clean water over a partially contracted thin-plate weir with a triangular notch of angle 20.23° and with zero weir height above the bottom of the approach channel ofrectangular cross-section at 5 approach channel widths and 7 heads. The description was based on the results from experimental research and numerical simulations. The numerical simulations allowed the description of the characteristics in parts of the flow where measurements were difficult to perform. The experimental research quantifies the validity of the numerical simulations and establish recommendations for construction of numerical models. The boundary between a partially contracted weir and a fully contracted weir was established by dimensionless approach channel width of the value 0.32, the flow characteristics (water surface, velocity) in the full range of the partially contracted weir (dimensionless approach channel width in range 0.32 ≤ BU* ≤ 1.00), and recommendations for the placement of a cross-section to measure water surface level for determine the heads (dimensionless distance −4 ≤ x* ≤ −2) were verified.

Tenkostěnný přeliv s trojúhelníkovým zářezem (tvar V); Volný přepad; Experimentální výzkum; Numerické simulace; Částečně zůžený přeliv

Tenkostěnný přeliv s trojúhelníkovým zářezem (tvar V); Volný přepad; Experimentální výzkum; Numerické simulace; Částečně zůžený přeliv

POSPÍŠILÍK, Š.; KOTAŠKA, S.; DUCHAN, D.; ZACHOVAL, Z.; ORFÁNUS, M.; ŠOLTÉSZ, A.; GRUCHOT, A.; ZYDROŃ, T.

01.06.2025

Sciendo

Bratislava, Slovak Republic

0042-790X

Journal of Hydrology and Hydromechanics

73

2

Slovak Republic

132

142

10

http://www.uh.sav.sk/vc_articles/2025_73_2_Pospisilik_132.pdf

http://hdl.handle.net/11012/255156

2025_73_2_Pospisilik_132