Study of Hydraulic Features of Flow Over Labyrinth Weir with Semi-circular Plan form

آب و خاک

Article 22, Volume 27, Issue 1, March 2013, Pages 224-234   

Document Type: Research Article

DOI: 10.22067/jsw.v0i0.22234

Authors

M. Esmaeili Varak^* ; M. Safarrazavi Zadeh

Abstract

Weirs are common structure to regulate water surface and flow control in water conveyance channel and hydraulic structure. One of effective and economical method to increase the efficiency of weirs is utilization of labyrinth weirs which length of weirs increase with modification of plan form and therefore flow discharge will be increase. In this research, the discharge coefficient and the unit length discharge of labyrinth weir with liner-semi circular and semi circular with radius of 11, 16 and 20 cm and cycle of 2 to 6 was experimentally investigated. Comparison of results showed that in all labyrinth flow discharge coefficient had increasing trend with increase of relative effective head ( ) then decrease for due to collision of nape and with increasing , weir coefficient tend to broad crest weir because of local submergence. Comparison of results showed that the labyrinth weirs with circular plan have a better performance in comparison with liner-circular plans.

Keywords

Labyrinth weir; Circular pan form weir; Flow discharge coefficient; Hydraulic structure