Longitudinal spread of bicomponent contaminant in wetland flow dominated by bank-wall effect
Longitudinal spread of bicomponent contaminant in wetland flow dominated by bank-wall effect
复制标题
岸墙效应主导的湿地流中双组分污染物的纵向扩散
DOI：
10.1016/j.jhydrol.2013.11.015
复制
发表时间：
2014-02
影响因子：
6.4
通讯作者：
L. Feng
中科院分区：
文献类型：
--
作者：
L. Zeng;Y.J. Zhao;B. Chen;P. Ji;Y.H. Wu;L. Feng
本文从理论上分析了在岸壁效应主导下，双组分污染物在充分发展的稳定湿地流中的纵向扩散规律。基于湿地水流浓度输运方程的一般形式，建立了在可逆反应、不可逆反应和水力弥散共同作用下，湿地水流浓度衰减的生态风险评价模型。通过求解线性抛物方程组的方法与湿地水流中水力弥散的渐近分析相结合，严格推导出了双组分污染物浓度长期演化的解析解，并给出了解析解的图解。该解决方案被证明是已知的解决方案的扩展，由于一个不可逆的反应和水力分散，以及生物组分污染物运输由于可逆的反应和水力分散的单组分污染物运输。结果表明，二元组分的浓度比可以接近平衡状态，达到平衡状态所需的时间取决于各组分的迁移和降解速率。给出了污染物云浓度超过环境标准的影响区域长度和持续时间。结果表明，长度随时间的增加而增大，达到最大值后减小为零，持续时间对无量纲参数的变化较为敏感，反映了不可逆作用和侧向质量弥散的相对重要性。
Presented in this paper is a theoretical analysis for longitudinal spread of bicomponent contaminant in a fully developed steady wetland flow dominated by bank-wall effect. Based on the general form of concentration transport equations adopted for wetland flows, an ecological risk assessment model is given for the decay of concentration under the combined action of reversible and irreversible reactions, as well as hydraulic dispersion. Through a combination of the method for solving linear parabolic system and an asymptotic analysis for hydraulic dispersion in the wetland flow, an analytical solution for long time evolution of bicomponent contaminant concentration is rigorously derived and illustrated. The solution is shown to be an extension of known solutions for single component contaminant transport due to an irreversible reaction and hydraulic dispersion, as well as biocomponent contaminant transport due to reversible reactions and hydraulic dispersion. It is found that the concentration ratio of binary components can approach an equilibrium status, with necessary time to obtain the status dependent on transfer and degradation rates of each component. The length and duration of influenced region with concentration of contaminant cloud beyond given environmental standard level are presented for a uniform instantaneous emission into the wetland flow. The result shows that the length increases with time to reach maximum and then decreases to zero, and the duration is sensitive to the variation of a dimensionless parameter to reflect the relative importance of an irreversible action and lateral mass dispersion.
登录
查看更多内容
影响因子：
3.1
作者：
Zeng, L.;Chen, G. Q.
通讯作者：
Chen, G. Q.
影响因子：
2.7
作者：
F. Carvalho;J. Villeneuve;C. Cattini;J. Rendón;J. Oliveira
通讯作者：
F. Carvalho;J. Villeneuve;C. Cattini;J. Rendón;J. Oliveira
影响因子：
4.1
作者：
G. Linder;R. Hazelwood;D. Palawski;J. Malloy;K. DuBois;M. Bollman;David C. Wilborn;S. Ott;G. Pascoe;Julie A. Dalsoglio
通讯作者：
G. Linder;R. Hazelwood;D. Palawski;J. Malloy;K. DuBois;M. Bollman;David C. Wilborn;S. Ott;G. Pascoe;Julie A. Dalsoglio
影响因子：
2.2
作者：
A. Lightbody;H. Nepf
通讯作者：
A. Lightbody;H. Nepf
DOI：
10.1007/978-94-009-2825-1_8
发表时间：
1988
期刊：
--
影响因子：
--
作者：
J. Brady;D. Koch
通讯作者：
J. Brady;D. Koch