Estimation of reliable Stage-Discharge Curve in meandering river using Conveyance Estimation System (CES) Model

Abstract

Water level estimation in river is important for management of schemes working on it. Uncertainty in estimation would increase the likelihood of confusion in scheme management and fail to achieve its objective. Consequently, reliable water level estimation enables to inform assessments regarding design and operation. In this paper, the experimental work has been conducted to verify the estimated rating curve using Conveyance Estimation System (CES) with uncertainty estimation based on the upper and lower roughness values built in. A straight channel is carved into the sand races of the experimental flume with an initial small bend at the upstream to provide a disturbance region. This disturbance induces the straight channel to take the meandering path. The water levels and the bed elevations are measured at specified cross sections along the channel when it reaches the state of equilibrium with different steady flows in order to construct the actual rating curve at specified cross sections. The obtained geometric and hydraulic data have been used for CES model to estimate the rating curve with uncertainty estimation. Results of the computations indicate that the CES model could adequately produce the stage-discharge curve in agreement with the observed values. It is anticipated that the results presented in this paper will aid the researchers in using the CES model as a predicting tool in the field of river engineering.