Abstract

This paper is an extension and continuation of an earlier work by the authors on the phenomenon of meandering in Al-Abbasia reach located in the middle of the Euphrates river, Najaf governorate in Iraq. The authors have developed several power functions models and models depending on dimensional analysis and Buckingham π-theorem for modeling and predicting the hydraulic geometry of the selected reach. The paper employs the nonlinear regression technique for developing mathematical models for computing the width and mean depth of the reach depending on its hydraulic characteristics. This paper is part of an M. Sc. thesis carried out in 2014. The developed relationships are straightforward to be applied in design and analysis with results of high acceptability; the reach width (W) model is with R2 of 0.97 while the reach mean depth (Dm) model is with R2 of 0.93. Different statistical methods have been utilized to compare among the different models. The results reveal that the non-linear regression models are the best models to correlate the different characteristics of the reach.