An improved equation development for longitudinal dispersion coefficient

The model developed in this paper is an improved equation for the longitudinal dispersion coefficient, which is an important parameter used to monitor and check the assimilatory capacity of rivers. This research incorporates total suspended solids (S_s) and total dissolved solids (D_s) to other selected functional parameters in order to investigate the contributions of S_s and D_s on the longitudinal dispersion coefficient. The results obtained from research indicates that the presence of S_s and D_s affects longitudinal dispersion coefficient as it reduces the magnitude of D_l values. The measured values of longitudinal dispersion coefficient estimated in this study vary between 71 and 104.4 m² s^-1. The percentage of D_r values estimated to be within 0.0 and 0.3 were 50.0% and within -0.3 and 0.0 were 50% for the developed equation and this indicates a degree of accuracy of 100.0%. While for Seo and Cheong, the percentage of D_r values determined to be within 0.0 and 0.3 were 63.3% and within -0.3 and 0.0 were 30% and gives a degree of accuracy of 93.3% and others are poor. SE, NME and MME results show a high accuracy for the derived equation revealing the adequacy of the derived equation in the estimation of D.