October 31, 2024
Mohamad Reza Madadi

Mohamad Reza Madadi

Academic rank: Associate professor
Address: Department of Water Engineering, Faculty of Agriculture, University of Jiroft, Jiroft, Iran
Education: PhD. in Water Structures
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Faculty:

Research

Title
Control of undular weir flow by changing of weir geometry
Type Article
Keywords
Undular flow,Broad-crested weir,Upstream face slope,Radius of upstream corner.
Researchers Mohamad Reza Madadi, Ali Hosseinzadeh, Davood Farsadizadeh

Abstract

Undular flow above the broad-crested weirs is an open channel flow phenomenon which occurs under certain hydraulic conditions. The flow surface on the weir transforms to sinusoidal waves and the number of waves may vary from one to over 10. Hence weir cannot be utilized to measure the flow discharge due to the formation of surface undulations above its crest. Propagated waves can be disturbed remarkably to the channel downstream. In this study, effects of upstream face slope of rectangular broad-crested weirs on the undular weir flow were investigated. The results obtained indicated when the weir upstream slope reduced from standard angle 90° to 40°, the relative wave height decreased up to 78% and the relative wave length increased up to 55%. The experimental results showed that wave was not generated above the weir with 21° upstream face. Furthermore, effects of the radius of curvature of weir upstream corner on the undular wave characteristics were studied. This study established that curvature and slope has similar effects on the wave elimination.