Suspended vegetation can disturb flow, thereby affecting mass transportation. Although theoretical study of longitudinal dispersion in suspended vegetated flows may be complex, physical factors influencing longitudinal dispersion are well known. The key studying longitudinal dispersion is to obtain time-averaged longitudinal velocity distribution and lateral diffusion coefficient. A four-zone model, which includes the four-zone velocity profile and the four-zone turbulent diffusion coefficient profile, is proposed in this study to incorporate with the random displacement model (RDM) to simulate solute transport in suspended vegetated flows. Considering that the experimental results are measured at the early stage of the longitudinal dispersion, the downstream distance between the instrument and the release position should be considered to determine the longitudinal dispersion coefficient rather than directly usi...
