The Hydraulic Performance Evaluation of a Compound Sharp Crested Weir with a Modified Trapezoidal–Semicircular Configuration
الباحث الأول:
Nabaa Noori Bashboosh
الباحثين الآخرين:
Fadhel Abdulabbas Hassan,Hanadi H. Zwain
المجلة:
Engineering, Technology & Applied Science Research
تاريخ النشر:
4 أكتوبر، 2025
مختصر البحث:
In this study, experimental work was performed to represent the flow within an open channel and through
a compound weir of semi-circular and trapezoidal sections for different flow conditions. This study aims to
evaluate the hydraulic performanc…
In this study, experimental work was performed to represent the flow within an open channel and through
a compound weir of semi-circular and trapezoidal sections for different flow conditions. This study aims to
evaluate the hydraulic performance of the compound weir by finding the value of the coefficient of
discharge, Cd, and deriving an equation linking the value of Cd to the rest of the hydraulic and geometric
parameters governing the flow conditions. Fifteen laboratory models of a sharp-crested compound weir
were tested inside a laboratory channel with dimensions of 0.3 m wide, 0.45 m high, and 15 m long. The
dimensions of the compound weir opening were changed while maintaining the general shape, which
consisted of a trapezoidal part with a different side slope (θ) and a semicircular part that remained
constant. The effects of water depth over the crest of compound weir (h), the depth of water upstream
compound weir (hu), the diameter of the semi-circular part (D), the width of the first base of the
trapezoidal part (b1), the width of the second base of the trapezoidal part (b2), the perpendicular height of
the trapezoidal part, and the slope of the trapezoidal side (θ) were taken into consideration in deriving a
non-dimensional formula representing the relationship between these parameters and Cd. Using Excel 365
and SPSS 26 software, a non-linear relationship was derived to estimate Cd, and a good value of the
coefficient of determination (R2) was achieved.
