An ecological risk assessment model for a pulsed contaminant emission   into a wetland channel flow

doi:10.1016/j.ecolmodel.2010.08.018

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	An ecological risk assessment model for a pulsed contaminant emission into a wetland channel flow
	Chen, G. Q. ; Zeng, L. ; Wu, Z.
刊名	ecological modelling
	2010
关键词	Wetland Ecological risk Environmental dispersion Contaminant emission Analytical solution EMERGENT VEGETATION SOLUTE-DISPERSION HEAT-TRANSFER POROUS-MEDIA FLUID PREDICTION DIFFUSION ESTUARIES TUBE
DOI	10.1016/j.ecolmodel.2010.08.018
英文摘要	As a continuation of the modelling on ecological degradation and hydraulic dispersion of pollutant emission into an idealized two-dimensional free-surface wetland flow (Zeng, L, Chen, G.Q., 2009b. Ecological degradation and hydraulic dispersion of contaminant in wetland. Ecol. Model., doi:10.1016/j.ecolmodel.2009.10.024), an ecological risk assessment model for the typical case of a pulsed contaminant emission into a realistic three-dimensional wetland channel flow is presented in this paper for the fate of cross-sectional mean concentration under environmental dispersion. An environmental dispersion model for the mean concentration is devised as an extension of Taylor's classical analysis on dispersion in fluid flows. The velocity distribution and the environmental dispersivity in the fully developed steady flow through the wetland is found and illustrated with limiting cases covering various known solutions for the porous media flow between parallel plates, flow in a shallow wetland, sweeping flow in a densely vegetated wetland, and single phase flow in a channel. Obtained by Aris's method of moments, the environmental dispersivity is shown characterized with multi-scale asymptotic time variations with stem dominated stage, transitional stage, and width-depth-stem dominated stage. Based on the solution for the evolution of contaminant cloud in the wetland channel flow, critical length and duration of the contaminant cloud with concentration beyond given environmental standard level are concretely illustrated for typical pollutant constituents in wastewater emission. Under the same emission intensity and environmental standard, the duration of contaminant cloud in the wetland channel is revealed shorter than that in a free surface wetland, due to the lateral effect. (C) 2010 Elsevier B.V. All rights; Ecology; SCI(E); 27; ARTICLE; 24; 2927-2937; 221
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/154785]
专题	工学院
推荐引用方式 GB/T 7714	Chen, G. Q.,Zeng, L.,Wu, Z.. An ecological risk assessment model for a pulsed contaminant emission into a wetland channel flow[J]. ecological modelling,2010.
APA	Chen, G. Q.,Zeng, L.,&Wu, Z..(2010).An ecological risk assessment model for a pulsed contaminant emission into a wetland channel flow.ecological modelling.
MLA	Chen, G. Q.,et al."An ecological risk assessment model for a pulsed contaminant emission into a wetland channel flow".ecological modelling (2010).