<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The article deals with the determination of the influence of the relative width of an approach channel with a rectangular cross-section on the discharge of clean water flowing over thin-plated weirs with a triangular notch and zero height of the weir above the bottom of the approach channel. To evaluate the influence, the Kindsvater-Shen equation was modified by introducing the basic effective discharge coefficient and the coefficient of the relative width of the approach channel. The coefficient of the relative width of the approach channel was determined based on the evaluation of data from three extensive experimental research investigations. It is valid for the entire possible range of relative widths of the approach channel and for the range of notch angles from 5.25° to 91.17°. The relative error of discharge determination is approximately up to ±2% over the entire range of discharges used in the conducted experimental research. The evaluation made it possible to determine the boundary distinguishing the partially contracted weirs from the fully contracted weirs in terms of impact on discharge.</p>
</abstract>

The article deals with the determination of the influence of the relative width of an approach channel with a rectangular cross-section on the discharge of clean water flowing over thin-plated weirs with a triangular notch and zero height of the weir above the bottom of the approach channel. To evaluate the influence, the Kindsvater-Shen equation was modified by introducing the basic effective discharge coefficient and the coefficient of the relative width of the approach channel. The coefficient of the relative width of the approach channel was determined based on the evaluation of data from three extensive experimental research investigations. It is valid for the entire possible range of relative widths of the approach channel and for the range of notch angles from 5.25° to 91.17°. The relative error of discharge determination is approximately up to ±2% over the entire range of discharges used in the conducted experimental research. The evaluation made it possible to determine the boundary distinguishing the partially contracted weirs from the fully contracted weirs in terms of impact on discharge.

Flow over thin-plate weirs with a triangular notch – influence of the relative width of approach channel with a rectangular cross-section

Brno University of Technology, Faculty of Civil Engineering

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The article deals with the determination of the influence of the relative width of an approach channel with a rectangular cross-section on the discharge of...

Flow over thin-plate weirs with a triangular notch – influence of the relative width of approach channel with a rectangular cross-section

Published Online: May 09, 2024

Page range: 199 - 206

Received: Nov 27, 2023

Accepted: Mar 12, 2024

DOI: https://doi.org/10.2478/johh-2024-0008

Keywords
Triangular notch (V-notch), Thin-plate weir, Kindsvater-Shen formula, Coefficient of the relative width

© 2024 Šimon Pospíšilík et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Flow over thin-plate weirs with a triangular notch – influence of the relative width of approach channel with a rectangular cross-section

Published Online: May 09, 2024

Page range: 199 - 206

Received: Nov 27, 2023

Accepted: Mar 12, 2024

DOI: https://doi.org/10.2478/johh-2024-0008

KeywordsTriangular notch (V-notch), Thin-plate weir, Kindsvater-Shen formula, Coefficient of the relative width

© 2024 Šimon Pospíšilík et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
Triangular notch (V-notch), Thin-plate weir, Kindsvater-Shen formula, Coefficient of the relative width