Author(s): P.M. Rowinski; M.B. Kalinowska; K. Vastila

Linked Author(s): Kaisa Västilä, Pawel M. Rowinski

Keywords: Heat transport; Mass transport; Natural rivers; Vegetation; Dispersion coefficients

Abstract: This contribution covers different aspects of heat and mass transport under natural conditions, bridging fundamental research to practical engineering challenges in watercourses. The transport of constituents or heat by dispersion, advection or other processes is dependent on hydrologic and hydrodynamic characteristics of a channel under consideration and they in turn depend on the geometry and morphometry of the river reach. The more geometrically complex the setting is, the more uncertain is the mathematical representation of the system. If we also consider the presence of vegetation along river channels, the transport processes become particularly difficult to describe. Vegetation influences the flow resistance of the watercourse, creates additional drag, causes a violent transverse mixing due to great differences in velocities between the vegetated and non-vegetated regions, and affects turbulence intensity and diffusion. On top of that, riparian vegetation often significantly alters the channel geometry. In the present study, authors will share their experience from both experimental and computational investigations on mass transport in rivers. Cases in which complexity of flow constitutes a key problem will be particularly discussed.

DOI: https://doi.org/10.3850/978-981-11-2731-1_228-cd

Year: 2018