Effects of Hyporheic Exchange and Settlement on the Particle Size Distribution of Colloids

IF 2.7 3区工程技术 Q3 ENGINEERING, CHEMICAL

Transport in Porous Media Pub Date : 2024-03-06 DOI:10.1007/s11242-024-02061-4

Zhongtian Zhang, Guangqiu Jin, Hongwu Tang, Wenhui Shao, Qihao Jiang, Xiaorong Zhou, Haiyu Yuan, David Andrew Barry

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Abstract

Colloid particle size plays an important role in contaminant adsorption and clogging in the hyporheic zone, but it remains unclear how the particle size changes during the transport of colloids. This study investigated the variation of the particle size of colloids in the overlying water and the effects of settlement and hyporheic exchange via laboratory experiments and numerical simulations with two main factors settlement and hyporheic exchange being considered. The results show that the particle size distribution varies when colloids transport in hyporheic zone, and both settlement and hyporheic exchange are involved in the exchange of colloids between stream and streambed. Large-sized particles are mainly controlled by settlement and advection and thus their concentration in the overlying water decreases more quickly; but small-sized particles are mainly controlled by hyporheic exchange and thus their concentration decreases more slowly, and some particles can be resuspended. The increase of retention coefficient and settling velocity will accelerate the transfer of colloids into the streambed. This study may provide important insights into the variation of the particle size of colloids in the overlying water and the effects of settlement and hyporheic exchange.

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孔隙水交换和沉降对胶体粒径分布的影响

摘要胶体粒径在底流区污染物吸附和堵塞过程中起着重要作用，但胶体在迁移过程中粒径如何变化仍不清楚。本研究通过实验室实验和数值模拟，研究了上覆水中胶体粒径的变化以及沉降和底流体交换的影响，主要考虑了沉降和底流体交换两个因素。结果表明，胶体在下垫面区迁移时，粒径分布会发生变化，沉降和下垫面交换都参与了溪流与河床之间的胶体交换。大颗粒主要受沉降和平流的控制，因此其在上覆水中的浓度下降较快；而小颗粒主要受微流体交换的控制，因此其浓度下降较慢，部分颗粒还可再悬浮。滞留系数和沉降速度的增加会加速胶体向河床的转移。这项研究可为了解上覆水中胶体粒径的变化以及沉降和流体交换的影响提供重要信息。

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来源期刊

Transport in Porous Media 工程技术-工程：化工

CiteScore

5.30

自引率

7.40%

发文量

155

审稿时长

4.2 months

期刊介绍： -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).