Taylor dispersion in wind-driven current

被引：12
|
作者：
Li, Gang [1 ]
Wang, Ping [2 ]
Jiang, Wei-Quan [3 ]
Zeng, Li [3 ]
Li, Zhi [1 ]
Chen, G. Q. [1 ]
机构：
[1] Peking Univ, Coll Engn, Beijing 100871, Peoples R China
[2] Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China
[3] China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China
来源：
JOURNAL OF HYDROLOGY | 2017年 / 555卷
基金：
中国国家自然科学基金;
关键词：
Wind-driven current; Taylor dispersion; Vertical concentration distribution; Method of concentration moments; SOLUTE-DISPERSION; BED ABSORPTION; STRAIGHT PIPE; LAMINAR-FLOW; WATER; TUBE; CIRCULATION; VEGETATION; TRANSPORT; MOMENTS;
D O I：
10.1016/j.jhydrol.2017.10.063
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Taylor dispersion associated with wind-driven currents in channels, shallow lakes and estuaries is essential to hydrological environmental management. For solute dispersion in a wind-driven current, presented in this paper is an analytical study of the evolution of concentration distribution. The concentration moments are intensively derived for an accurate presentation of the mean concentration distribution, up to the effect of kurtosis. The vertical divergence of concentration is then deduced by Gill's method of series expansion up to the fourth order. Based on the temporal evolution of the vertical concentration distribution, the dispersion process in the wind-driven current is concretely characterized. The uniform shear leads to a special symmetrical distribution of mean concentration free of skewness. The non-uniformity of vertical concentration is caused by convection and smeared out gradually by the effect of diffusion, but fails to disappear even at large times. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：697 / 707
页数：11
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