Transport of a volatile contaminant in a free-surface wetland flow

doi:10.1007/s11707-013-0364-0

Front Earth Sci

2014, Vol. 8

Issue (1) : 115-122 https://doi.org/10.1007/s11707-013-0364-0

RESEARCH ARTICLE

Transport of a volatile contaminant in a free-surface wetland flow

Jue YUAN¹, Li ZENG¹(

), Yijun ZHAO¹, Yihong WU¹, Ping JI¹, Bin CHEN²

1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 2. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China

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Abstract

Presented in this paper is an analytical study of a pulsed volatile contaminant emission into a free-surface wetland flow. A simplified model is given for contaminant transport under the combined action of advection, mass dispersion, apparent reaction, and volatilization at the free water surface. The effect of periodic apparent reaction on contaminant transport is separated from the hydraulic effect via an extended transformation, with a limiting case covering the known transformation for constant apparent reaction rate. The analytical solutions of zeroth and first order concentration moments are rigorously derived and illustrated. It was found that the amount of contaminant decreases from the bottom bed to the free-surface under volatilization, and the total amount of contaminant decays with time. It was also found that the moving speed of the mass center of the whole contaminant cloud increases, as the ratio of volatilization coefficient to vertical effective mass dispersivity increases.

Keywords contaminant transport volatilization reaction wetland hydraulics

Corresponding Author(s): ZENG Li,Email:lizeng0914@163.com

Issue Date: 05 March 2014

Cite this article:

Jue YUAN,Li ZENG,Yijun ZHAO, et al. Transport of a volatile contaminant in a free-surface wetland flow[J]. Front Earth Sci, 2014, 8(1): 115-122.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-013-0364-0
https://academic.hep.com.cn/fesci/EN/Y2014/V8/I1/115

Fig.1 Sketch for a free-surface wetland flow under volatilization.

Fig.2 Variation of Λwith for =1, and =0.1, 0.2, and 0.3.

Fig.3 Variation of Λwith for =1, and =0.1, 0.2, and 0.3.

Fig.4 Variation of Λ with for =1, and =0.1, 0.2, and 0.3.

Fig.5 Variation of Λ with τ for =0.2, and =0.5, 1, and 2.

Tab.1 Eigenvalues (=1, 2, 3, 4 and 5) for =0.25, 0.5, 1.0, 2.0, and 4.0

Fig.6 Variation of with for =0.1, and = 0.25, 0.5, 1.0, 2.0 and 4.0.

Fig.7 Variation of with for =1, and = 0.25, 0.5, 1.0, 2.0 and 4.0.

Fig.8 Variation of with for = 0.25, 0.5, 0.75, 1.0, and 2.0.

Fig.9 Variation of / with for, =1.0, =1.0 and = 0.25, 0.5, 1.0, 2.0 and 4.0.

Fig.10 Variation of with for, =1.0, and = 0.25, 0.5, 1.0, 2.0 and 4.0.

1	Aris R (1956). On the dispersion of a solute in a fluid flowing through a tube. P Roy Soc Lond A Mat 235(1200), 67-77
2	Barton N G (1983). On the method of moments for solute dispersion. J Fluid Mech , 126(1): 205-218 doi: 10.1017/S0022112083000117
3	Chen G Q, Wu Z, Zeng L (2012). Environmental dispersion in a two-layer wetland: analytical solution by method of concentration moments. Int J Eng Sci , 51: 272-291 doi: 10.1016/j.ijengsci.2011.09.009
4	Chen G Q, Zeng L, Wu Z (2010). An ecological risk assessment model for a pulsed contaminant emission into a wetland channel flow. Ecol Model , 221(24): 2927-2937 doi: 10.1016/j.ecolmodel.2010.08.018
5	Chen Z M, Chen G Q, Chen B, Zhou J B, Yang Z F, Zhou Y (2009). Net ecosystem services value of wetland: Environmental economic account. Commun Nonlinear Sci Numer Simul , 14(6): 2837-2843 doi: 10.1016/j.cnsns.2008.01.021
6	Costanza R, d’Arge R, de Groot R, Farber S, Grasso M, Hannon B, Limburg K, Naeem S, O’Neill R V, Paruelo J, Raskin R G, Sutton P, van den Belt M (1997). The value of the world’s ecosystem services and natural capital. Nature , 387(6630): 253-260 doi: 10.1038/387253a0
7	Fried J J (1975). Groundwater Pollution: Theory, Methodology, Modelling and Practical Rules. Amsterdam: Elsevier Scientific Publishing Company
8	Lightbody A F, Nepf H M (2006a). Prediction of velocity profiles and longitudinal dispersion in emergent salt marsh vegetation. Limnol Oceanogr , 51(1): 218-228 doi: 10.4319/lo.2006.51.1.0218
9	Lightbody A F, Nepf H M (2006b). Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology. Environ Fluid Mech , 6(5): 477-488 doi: 10.1007/s10652-006-9002-7
10	Liu S, Masliyah J H (2005). Dispersion in porous media. In: Vafai K ed. Handbook of Porous Media . Boca Ratton: CRC Press, 81-140
11	Mei C C, Auriault J L, Ng C O (1996). Some applications of the homogenization theory. In: Hutchinson J W, Wu T Y eds. Advances in Applied Mechanics . California: Academic Press, 277-348
12	Mitsch W J, Gosselink J G (1993). Wetlands (2nd ed). New York: Van Nostrand Reinhold
13	Murphy E, Ghisalberti M, Nepf H (2007). Model and laboratory study of dispersion in flows with submerged vegetation. Water Resour Res , 43(5): W05438 doi: 10.1029/2006WR005229
14	Nepf H, Ghisalberti M, White B, Murphy E (2007). Retention time and dispersion associated with submerged aquatic canopies. Water Resour Res , 43(4): W04422 doi: 10.1029/2006WR005362
15	Shao L, Wu Z, Zeng L, Chen Z M, Zhou Y, Chen G Q (2012). Embodied energy assessment for ecological wastewater treatment by a constructed wetland. Ecol Model , doi: 10.1016/j.ecolmodel.2012.09.004
16	Taylor G (1953). Dispersion of soluble matter in solvent flowing slowly through a tube. P Roy Soc Lond A Mat . 219(1137): 186-203
17	Wu Z, Chen G Q, Zeng L (2011a). Environmental dispersion in a two-zone wetland.Ecol Modell , 222(3): 456-474 doi: 10.1016/j.ecolmodel.2010.10.026
18	Wu Z, Li Z, Chen G Q (2011b). Multi-scale analysis for environmental dispersion in wetland flow. Commun Nonlinear Sci Numer Simul , 16(8): 3168-3178 doi: 10.1016/j.cnsns.2010.12.002
19	Wu Z, Zeng L, Chen G Q, Li Z, Shao L, Wang P, Jiang Z (2012). Environmental dispersion in a tidal flow through a depth-dominated wetland. Commun Nonlinear Sci Numer Simul , 17(12): 5007-5025 doi: 10.1016/j.cnsns.2012.04.006
20	Zeng L 2010. Analytical Study on Environmental Dispersion in Wetland Flow. Disseration for Ph D degree . Beijing: Peking University (in Chinese)
21	Zeng L, Chen G, Wu Z, Li Z, Wu Y H, Ji P (2012a). Flow distribution and environmental dispersivity in a tidal wetland channel of rectangular cross-section. Commun Nonlinear Sci Numer Simul , 17(11): 4192-4209 doi: 10.1016/j.cnsns.2012.03.002
22	Zeng L, Chen G Q (2011). Ecological degradation and hydraulic dispersion of contaminant in wetland. Ecol Modell , 222(2): 293-300 doi: 10.1016/j.ecolmodel.2009.10.024
23	Zeng L, Chen G Q, Tang H S, Wu Z (2011). Environmental dispersion in wetland flow. Commun Nonlinear Sci Numer Simul , 16(1): 206-215 doi: 10.1016/j.cnsns.2010.02.019
24	Zeng L, Wu Y, Ji P, Chen B, Zhao Y J, Chen G Q, Wu Z (2012b). Effect of wind on contaminant dispersion in a wetland flow dominated by free-surface effect. Ecol Modell , 237-238: 101-108 doi: 10.1016/j.ecolmodel.2012.04.020

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