“…where K x is the longitudinal dispersion coefficient, t is the time, x and u are the longitudinal coordinate and mean cross-sectional velocity, respectively, and C is the averaged cross-sectional concentration (Noori et al, 2011). Regarding K x , it can be determined experimentally, empirically, and theoretically (Camacho Suarez et al, 2019;Data, 2019;Deng et al, 2002Deng et al, , 2001Disley et al, 2015;Milišić et al, 2019;Perucca et al, 2009;Seo & Baek, 2004;Seo & Cheong, 1998;Shin et al, 2019;Shucksmith et al, 2011;Swamee et al, 2000;Wang & Huai, 2016;Zeng & Huai, 2014). The direct experimental determination of the dispersion coefficient demands cost and time inefficient tracer studies and could be done only with rectangular flumes data (Etemad-Shahidi & Taghipour, 2012).…”