Concentration distribution of environmental dispersion in a wetland flow: Extended solution
Concentration distribution of environmental dispersion in a wetland flow: Extended solution
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湿地流中环境扩散的浓度分布：扩展解
DOI：
10.1016/j.jhydrol.2017.03.016
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发表时间：
2017-06
影响因子：
6.4
通讯作者：
Chen G. Q.
中科院分区：
文献类型：
--
作者：
Jiang Wei-Quan;Wang Ping;Chen G. Q.
湿地水体中污染物运移的水文过程具有环境弥散的特征。对于标量色散的浓度分布，严格扩展了小时间尺度上垂直分布（Wu et al., 2015）的初步估计，以考虑偏度和峰度等高阶效应。结合Aris的浓度矩法和Gill的广义色散模型，导出了垂直分布函数的最高四阶项和全时二维浓度分布。主要代表湿地植被密度的阻尼因子的增量增强了平均分布的不对称性，降低了纵向弥散性（相对于偏度和峰度），增加了垂直分布的不均匀性。因此，浓密的植被对应较大的阻尼因子会延迟Taylor色散模型成立的时间，并且一阶近似在小时间尺度上变得粗糙，需要进行高阶修正。结果为典型的湿地水流环境弥散提供了更详细、更准确的解析解。
Hydrological processes of contaminant transport in wetland flows are characterized by environmental dispersion. For concentration distribution of scalar dispersion, the preliminary estimate of vertical distribution (Wu et al., 2015) on small time scale is rigorously extended to account for high order effects as skewness and kurtosis. Based on a combination of Aris’ method of concentration moments and Gill’s generalized dispersion model, up to fourth order terms of vertical distribution functions and full-time two-dimensional concentration distribution are derived. The increments of damping factor, mainly representing the density of vegetation in wetlands, is shown to strengthen the mean distribution asymmetry and reduce the longitudinal dispersivity (with respect to skewness and kurtosis), and to increase the non-uniformity of vertical distribution. Therefore, dense vegetation corresponding to a large damping factor will postpone the time when Taylor’s dispersion model holds, and the first order approximation becomes rough on small time scale, demanding higher order modifications. The results provide more detailed and more accurate analytical solution for the typical environmental dispersion in wetland flows.
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影响因子：
3.1
作者：
Zeng, L.;Chen, G. Q.
通讯作者：
Chen, G. Q.
岸墙效应主导的湿地流中双组分污染物的纵向扩散
影响因子：
6.4
作者：
L. Zeng;Y.J. Zhao;B. Chen;P. Ji;Y.H. Wu;L. Feng
通讯作者：
L. Feng
明渠流中标量输运的解析解：慢衰减瞬态效应
影响因子：
6.4
作者：
Wu Zi;Chen G. Q.
通讯作者：
Chen G. Q.
DOI：
10.1098/rspa.1972.0040
发表时间：
1972-03
期刊：
Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
影响因子：
--
作者：
W. Gill;R. Sankarasubramanian
通讯作者：
W. Gill;R. Sankarasubramanian
DOI：
10.1098/rspa.1967.0107
发表时间：
1967-05
期刊：
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
影响因子：
--
作者：
W. Gill
通讯作者：
W. Gill