Contaminant transport in a three-zone wetland: Dispersion and ecological   degradation

doi:10.1016/j.jhydrol.2016.01.008

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	Contaminant transport in a three-zone wetland: Dispersion and ecological degradation
	Luo, Jing ; Huai, Wenxin ; Wang, Ping
刊名	JOURNAL OF HYDROLOGY
	2016
关键词	Three-zone wetland Dispersion Ecological degradation Asymptotic analysis ENVIRONMENTAL DISPERSION LONGITUDINAL DISPERSION RIPARIAN VEGETATION FLOW FLUID CHANNELS SOLUTE
DOI	10.1016/j.jhydrol.2016.01.008
英文摘要	To further understand the fate of contaminant transport in real waterways interacting with riparian buffers and adjacent aquatic vegetation, solute dispersion is analytically explored for three-zone wetland flows with usually high Peclet number in this paper. Ecological effects are also taken into account. Environmental dispersion is addressed independently via an exponential transformation of the basic formulation of mass transfer in the context of porous media flow. After rigorously generalizing Taylor's classical analysis, asymptotic analysis was used instead of the method of concentration moment or multi scale analysis to simplify the examination. The mean concentration expansion base in Gill's method is adopted to model concentration deviations produced in the lateral-average operation. With a previously derived velocity profile, environmental dispersivity is obtained, effectively illustrating the effects of critical dimensionless parameters. Analytical expressions for evolution of the lateral mean concentration and critical length of the contaminant cloud are determined by combining the effects of both hydraulic dispersion and ecological degradation. An application example is provided to illustrate the evolution of contaminant cloud in terms of the critical length and duration with concentration greater than a given environmental standard level. Results show that for three-zone wetlands, the duration is clearly increased while the region affected by the contaminant cloud is slightly smaller than that for two zone wetland flows. (C) 2016 Elsevier B.V. All rights reserved.; Key Program of National Natural Science Foundation of China [51439007]; Natural Science Foundation of China [11372232]; Specialized Research Fund for the Doctoral Program of Higher Education [20130141110016]; SCI(E); EI; ARTICLE; wxhuai@whu.edu.cn; 341-351; 534
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437637]
专题	工学院
推荐引用方式 GB/T 7714	Luo, Jing,Huai, Wenxin,Wang, Ping. Contaminant transport in a three-zone wetland: Dispersion and ecological degradation[J]. JOURNAL OF HYDROLOGY,2016.
APA	Luo, Jing,Huai, Wenxin,&Wang, Ping.(2016).Contaminant transport in a three-zone wetland: Dispersion and ecological degradation.JOURNAL OF HYDROLOGY.
MLA	Luo, Jing,et al."Contaminant transport in a three-zone wetland: Dispersion and ecological degradation".JOURNAL OF HYDROLOGY (2016).