Lateral concentration distribution of contaminant transport in tidal wetland flows
Lateral concentration distribution of contaminant transport in tidal wetland flows
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潮汐湿地流中污染物迁移的横向浓度分布
DOI：
10.1016/j.jhydrol.2020.124978
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发表时间：
2020-08
影响因子：
6.4
通讯作者：
Z.Q. Zhang
中科院分区：
文献类型：
--
作者：
Ping Wang;Z.Q. Zhang
潮汐流，除了植被，引入相当复杂的湿地流中的污染物的运输。在湿地可视为多孔介质的假设下，采用相平均技术，得到了潮汐湿地水流在宏观相平均尺度上明显连续的浓度分布，而不是在微观植物尺度上极其复杂的浓度分布。为了满足严格的环境和健康风险评估对浓度峰值位置和数值的精确要求，本文研究了横向浓度分布，而不是通常研究的近似纵向分布的平均浓度。具体推导了潮汐湿地水流的横向浓度函数，以支持广义弥散模型的一阶级数展开。我们发现，横向浓度的不均匀性可以定性地改变作为污染物云被带回上游的潮汐流。浓度峰值位置随潮流的变化周期性地出现在中心线或壁面，在输运过程中浓度峰值甚至会增大。由于其分析功能，这项工作提供了一个模型，计算成本低，有效的环境管理。
Tidal flows, in addition to the vegetation, introduce considerable complexity into the transport of contaminants in wetland flows. Under the hypothesis that wetlands can be treated as porous media, we apply the phase averaging technique to obtain the apparently continuous concentration distribution at the macro phase-average scale in tidal wetland flows, rather than the extremely complex concentration distribution at the micro plant scale. To meet the requirements of precise concentration in terms of peak concentration position and value for strict environmental and health risk assessments, this work studied the lateral concentration distribution rather than the generally studied approximate longitudinally distributed mean concentration. The lateral concentration functions for tidal wetland flows are concretely derived to support the first-order series expansion of the generalized dispersion model. We show that the lateral concentration nonuniformity can be qualitatively altered as the contaminant cloud is carried back upstream by tidal flows. The peak concentration position periodically appears at the center line or at the wall depending on the tidal flows, and the peak concentration value can even be increased in the transport process. Due to its analytical features, this work provides a model with low computational cost for effective environmental management.
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