Flow condition identification and discharge calibration for submerged radial gatesBy YONG-XIN GUO, XIN-LEI GUO, YI-SEN WANG, TAO WANG, HUI FU and JIA-ZHEN LI, J. Hydraulic Res. 59(4), 2021, 683–690 https://doi.org.10.1080/00221686.2020.1818305.

The Authors presented an interesting technique to decrease the errors of estimating the outflow from radial gates through the "calibration method" under submerged flow conditions. Under partially submerged flow, the I MARE i values for discharge prediction by Eq. (14) of the original paper, compared with Bijankhan et al. ([1]), increased from 3.2% to 4.2% for music note and from 5% to 5.3% for hard rubber gates. Notation Graph HT <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>E</mi><mi>r</mi></msub></math> ht combined parameter of relative gate opening and submergence ratio (-) Graph HT <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mrow><mi mathvariant="sans-serif">F</mi></mrow><mrow><mi mathvariant="sans-serif">j</mi></mrow></msub></math> ht jet Froude number at vena contracta (-) I n i number of data sets (-) Graph HT <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Q</mi><mrow><mi>M</mi><mi>e</mi><mi>a</mi><mi>s</mi><mi>u</mi><mi>r</mi><mi>e</mi><mi>d</mi></mrow></msub></math> ht measured discharge (m SP 3 sp s SP -1 sp ) Graph HT <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Q</mi><mrow><mi>P</mi><mi>r</mi><mi>e</mi><mi>d</mi><mi>i</mi><mi>c</mi><mi>t</mi><mi>i</mi><mi>o</mi><mi>n</mi></mrow></msub></math> ht predicted discharge (m SP 3 sp s SP -1 sp ) Graph HT <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>w</mi></math> ht gate opening (m) Graph HT <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>X</mi><mi>r</mi></msub></math> ht submergence ratio (-) Graph HT <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>y</mi><mn>1</mn></msub></math> ht upstream flow depth (m) References 1 Bijankhan, M., Ferro, V., & Kouchakzadeh, S. (2013). [Extracted from the article]