Article: Hybrid model development for the decaying pollutant transport in streams Journal: International Journal of Environment and Waste Management (IJEWM) 2013 Vol.12 No.2 pp.130 - 145 Abstract: A Hybrid Cells in Series (HCIS) model with decay (HCIS-D) has been conceptualised to simulate advection, dispersion, decay governed pollutant transport. The cells consist of a plug flow zone followed by two unequal size thoroughly mixed zones applied to steady flow and prismatic stream reaches. Compared to the analytical solution of the advection-dispersion-decay equation, the HCIS–D simulations were in good agreement when the size of the hybrid unit, Δx, satisfies the condition, Δx u/DL ≥ 4 or [(α + T1 + T2)u/Δx] ≈ 1, where u is the mean flow velocity, DL is the longitudinal dispersion co-efficient, α, T1 and T2 are residence times of plug flow zone, first and second mixed zones of hybrid unit respectively. The potential of the HCIS-D model has been demonstrated using synthetic and field data and the results of the HCIS–D model for non-conservative/decaying pollutant transport were in the expected lines. Inderscience Publishers - linking academia, business and industry through research

Title: Hybrid model development for the decaying pollutant transport in streams

Authors: Muthukrishnavellaisamy Kumarasamy; Narayan C. Ghosh; Govinda C. Mishra; Mitthan L. Kansal

Addresses: School of Civil Engineering Surveying and Construction, University of KwaZulu-Natal, 4001, Durban, South Africa ' Scientist F & Head, Groundwater Division, National Institute of Hydrology, Roorkee 247667, India ' Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee 247667, India ' Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee 247667, India

Abstract: A Hybrid Cells in Series (HCIS) model with decay (HCIS-D) has been conceptualised to simulate advection, dispersion, decay governed pollutant transport. The cells consist of a plug flow zone followed by two unequal size thoroughly mixed zones applied to steady flow and prismatic stream reaches. Compared to the analytical solution of the advection-dispersion-decay equation, the HCIS–D simulations were in good agreement when the size of the hybrid unit, Δx, satisfies the condition, Δx u/D_L ≥ 4 or [(α + T₁ + T₂)u/Δx] ≈ 1, where u is the mean flow velocity, D_L is the longitudinal dispersion co-efficient, α, T₁ and T₂ are residence times of plug flow zone, first and second mixed zones of hybrid unit respectively. The potential of the HCIS-D model has been demonstrated using synthetic and field data and the results of the HCIS–D model for non-conservative/decaying pollutant transport were in the expected lines.

Keywords: non-conservative pollutants; first order decay; hybrid cells modelling; hybrid model development; decaying pollutants; pollutant transport; streams; water pollution; simulation; advection; dispersion.

DOI: 10.1504/IJEWM.2013.055589

International Journal of Environment and Waste Management, 2013 Vol.12 No.2, pp.130 - 145

Published online: 20 Sep 2014 *

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Title: Hybrid model development for the decaying pollutant transport in streams

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