eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences December 2008 20 3 523 534 jusps-B 1334 article An exponential equation for predicting bed load transport rate in Tapi river, India S.M. Yadav (shivnam27@yahoo.co.in) 1 B.K. Samtani (samtanibk@yahoo.com) 2 Civil Engineering Department, S.V., National Institute of Technology, Surat - 395 007 Gujrat (INDIA) Professor, Dean and PG In charge (Water) Civil Engineering Department,S.V., National Institute of Technology, Surat - 395 007 Gujrat (INDIA) <p style="text-align: justify;">The effect of non uniformity of bed material on the sediment transport has been studied by various investigators in the past. They .developed the transport rate equation for particular size of sediment in a non uniform bed material, where as the influence of other sizes of sediments has been neglected. The majority of the bed load formulae represent a functional relation between bed load discharge and shear stress. The formulae are characterized by three aspects namely the basic function q<sub>b</sub> = A f (t<sub>0</sub>-t<sub>c</sub>). The characteristic grain-size to be used and the correction applied to bed load equations. The main objectives of this paper are to estimate bed load of monsoon season, to analyze the sediment load during monsoon, using various measured parameters determine q<sub>b</sub>, t<sub>0</sub> and t<sub>c</sub> and to develop new bed load equation. The bed load equation can be approximated in exponential form as Y = a X <sup>b</sup>. For this purpose bed load, shear stress and critical shear stress are computed. The statistical analysis and curve fitting (by nonlinear square fitter) is carried out by using allometric function of Micro cal Origin 6.1. The modified bed load equation of Duboy&#39;s for Tapi river, Monsoon season and for Sarangkheda gauging station is Y =10.27529 X <sup>1.53544</sup>. The proposed bed load equation is tested using five years data of Tapi River. Also, model is tested using data of seven world rivers. The statistical analysis is carried out by computing rmse, inequality ratio and discrepancy ratio. The analysis suggests good agreement between measured and predicted bed load for Tapi river and 5 out of 10 rivers across the globe.<br /> &nbsp;</p> https://ultraphysicalsciences.org/paper/1334/ Bed load equation DuBoy Effective shear stress Mathematical model