Author(s): Hossein Hamidifar, Maryam Askari
Linked Author(s): Hossein Hamidifar
Keywords: River, pollution transport, water quality, vegetation, flow relative depth
Abstract: Due to the complexity in cross section, flow in a compound channel is completely different from that in a simple channel. The presence of vegetation over floodplains increases the level of complexity. In this paper, the effects of the floodplain vegetation density as well as relative flow depth on the longitudinal dispersion coefficient in an asymmetric compound channel are studied. A 10% solution of Potassium Permanganate is used as a tracer. Using image processing technique, variations of the tracer concentration at the three sections downstream of the release point are measured. The standard moment method has been used for calculation of the longitudinal dispersion coefficient in each section. The results showed that the dimensionless form of the longitudinal dispersion coefficient increases and decreases with relative flow depth as well as vegetation density, in the main channel and over the floodplain, respectively
Year: 2017