Experimental Study of Hydraulic Response for Combined Weir-Gate Flow of Composite Shape

Composite hydraulic structures play a vital role in controlling the flow in the irrigation system because of the interaction between over flow velocity from weir and under flow velocity from gate and this interaction will reflect on hydraulic response of structure. In the present work, numerous experiments were carried out in the laboratory of hydraulic engineering considering many variables that have direct contact in flow interaction and these variables are divided into two parts: the first is non-dimensional variable such as coefficient of discharge, Reynolds number and Froude number. The second is dimensional variable flow-rate and water depth above weir. These variables are considered for both upstream and downstream of the flume respectively and for different tested models of composite device. This study reviews that the flow velocity and the flow depth of water above the weir have major effect on hydraulic response in upstream and downstream of the flume respectively. The hydraulic response express in term of non-dimensional variable and dimensional variable. Keywords: Composite hydraulic structure, Composite device, Froude number, Reynolds numbe