The effect of density‐driven flow on the transport of high‐concentration solutes in the hyporheic zone,Hydrological Processes

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The effect of density‐driven flow on the transport of high‐concentration solutes in the hyporheic zone
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-10-21 , DOI: 10.1002/hyp.13949
Guangqiu Jin _{1,

2} , Yongfei Hao _{1,

2} , Jie Wei ₃ , Yihang Yang ₄ , Xiaoxiao Shen ₅ , Hongwu Tang _{1,

2} , Ling Li ₆

Affiliation

In this study, both laboratory experiments and numerical simulations were conducted to investigate the effect of density‐driven flow on the transport of high‐concentration pollutants in the hyporheic zone. The results show that the density gradient can change the flow of pore water and the strong density‐driven flow can lead to an unstable flow, which increases the effect of preferential flow and thus causes the appearance of solute fingers in the hyporheic zone. Notably, these solute fingers become more obvious with the increase of depth. The appearance of solute fingers depends on the relative strength of the pumping exchange and density gradient, which are represented by the dimensionless number M* and N* respectively. Finger flows appear near the interface when M^* is less than 0.5 N^*. This study may contribute to better understanding the transport and destination of solutes and thus may provide some insights into the assessment on pollution incidents.

中文翻译：

密度驱动的流动对流变带中高浓度溶质运移的影响

在这项研究中，进行了实验室实验和数值模拟，以研究密度驱动流对流变带中高浓度污染物迁移的影响。结果表明，密度梯度会改变孔隙水的流动，而强的密度驱动流动会导致不稳定的流动，从而增加优先流动的效果，从而导致溶质指状物出现在流变带中。显然，这些溶质指随着深度的增加而变得更加明显。溶质指的外观取决于泵送交换的相对强度和密度梯度，分别由无因次数M *和N *表示。当M时手指流出现在界面附近^*小于0.5 N ^*。这项研究可能有助于更好地理解溶质的运输和目的地，从而可以对污染事件的评估提供一些见识。

更新日期：2020-10-21

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