The method of evaluating the distribution of average velocity and discharge in Navrood River

Subject Areas : hydraulic structures

Farnaz  Daneshvar Vousoughi ¹ (Department of Civil Engineering, Ardabil Branch, Islamic Azad University, Ardabil, Iran.)

Received: 2022-10-29 Accepted : 2023-10-03 Published : 2022-11-22

Keywords: Estimation, RMSE, the Shiono and Knight Method, Compound cross sections,

Abstract :

A large number of river engineering projects, e.g. design of flood-control discharges, realignment of river channels, bank protection and sediment transport, requires accurate estimation of discharge in the compound channels such as rivers. Shiono-Knight method (SKM) is known as a capable tool to modeling discharge in prismatic compound channels. This research used the SKM, which is based on solving two-dimensional equations for flows in open channel by averaging the Navier-Stokes equations. Firstly, the values of depth-averaged velocities and discharge were calculated, then those compared with measurement data in 92-93 time period. Finally, the relation between depth and discharge flow have been stablished for 92-93 time period. The results of predicted depth-averaged velocity and discharge obtained from SKM compared with measured values indicate that SKM can accurately predict the velocity distributions if the two coefficients of friction factor and Roaring manning are chosen based on accurate patterns. The results of model shows to be not good agreement with experimental data. The discharge and depth-averaged velocity were estimated with 3.8 and 12.5 percent error.