Backwater profile during barrage gate operation for variable pond levels

Abstract

The backwater profile plays an important role in the design and performance of any hydraulic structures. Various methods are already in practice for the estimation of backwater profile. Present study attempts to estimate the backwater profiles due to barrage gate operations considering variable pond levels for alluvial channels using both theoretical analysis and laboratory model tests. The physical model tests were conducted for different pond levels and discharges. Backwater profiles obtained from theoretical and physical model tests data were compared with those obtained from available methods. Finally, a non-dimensional relationship has been established between the pond level and the backwater length.

Keywords:

• backwater profile
• barrage gate opening
• discharge
• pond level
• thalweg

Acknowledgement

The authors express their gratitude to Dr M. De, Director, River Research Institute, WB, for valuable suggestion and to help this work. Sincere thanks are due to Sri Abhijit Roy (RO, Hydraulics); Sri Sudip Chatterjee, RA; Sri Subir Dutta, Surveyor; and Sri Sagar Roy, Model Boy, for their immense help at different stages of this experimental work at Meandering Model, Haringhata Central Laborotory, Mohanpur, Nadia, West Bengal.