Experimental Investigation of Discharge and Flow Energy Dissipation of Elliptical Lopac Gate in Free Flow Condition

Document Type : Research Paper


1 water structure shahid chamran university of ahvaz

2 Professor, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz.


Lopac gate as a new water level adjustment structure has some advantage such as overpass flow, passing sediment, the foliage of trees along with the flow, so has recently attracted attention and applied in irrigation channels. In this study, a laboratory evaluation on the new type of this gate called Elliptical Lopac Gate has been investigated. The experiments were conducted in a flume with a length of 10 meters and a width of 0.8 meters, a height of 0.6 meters was selected for 5 discharge and for 5 different opening degrees. According to the results, discharge relationship has a direct relation of the gate opening ratio and the ratio of flume width to the water level in the upstream. Subsequently, the dimensionless relationship was proposed to estimate the discharge of flow with high precision (MAPE =4.44 %). Also, the variation of flow energy passing over the Elliptical lopac Gate in free flow conditions is a function of the opening ratio and Froude number.


Main Subjects

  • Receive Date: 29 May 2019
  • Revise Date: 04 January 2020
  • Accept Date: 03 February 2020
  • First Publish Date: 03 February 2020