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Title: Modeling pollutant transport in overland flow over non-planar and non-homogenous infiltrating surfaces
Authors: He, Zhi-guo
Tayfur, Gökmen
Ran, Qihua
Weng, Haoxuan
Tayfur, Gökmen
Izmir Institute of Technology. Civil Engineering
Keywords: Diffusion wave
Overland flow
Issue Date: Feb-2013
Publisher: Zhejiang University Press
Source: He, Z.-G., Tayfur, G., Ran, Q.-H., and Weng, H.-X. (2013). Modeling pollutant transport in overland flow over non-planar and non-homogenous infiltrating surfaces. Journal of Zhejiang University: Science A, 14(2), 110-119. doi:10.1631/jzus.A1200231
Abstract: Pollutant transport in overland flow over surfaces with spatially varying microtopography, roughness, and infiltration was investigated using the diffusion wave equation and transport rate-based equation. The finite volume method in space and an implicit backward difference scheme in time were employed in the numerical solution of the 2D governing equations. The developed model was first tested against an analytical solution and an experimental study involving overland flow and the associated pollutant transport, subsequently a series of numerical tests were carried out. Non-point source pollution was investigated under spatially varying microtopography, roughness, and infiltration. The simulation results showed that microtopography and roughness were the dominant factors causing significant spatial variations in solute concentration. When the spatially varying microtopography was replaced by a smooth surface, the result was an overestimation of the solute rate at the outlet of the upland. On the other hand, when the spatially varying roughness was replaced by the average roughness and spatially varying infiltration rate by the average infiltration rate, the pollutant discharge at the outlet of the upland was not significantly affected. The numerical results further showed that one cannot ignore the spatial variations of slope and roughness when investigating the local pollutant concentration distribution.
ISSN: 1673-565X
Appears in Collections:Civil Engineering / İnşaat Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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