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

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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.

Highlights

  • The distribution of colloidal particle size varies during the transport process in hyporheic zone.

  • Larger sized colloidal particles are affected by settlement more when transport in hyporheic zone, while smaller sized are affected by both hyporheic exchange and settlement.

  • The increase of retention coefficient and settling velocity will accelerate the transfer of colloids into the streambed, and the effect of settling velocity is more sensitive than that of retention coefficient.

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Data Availability

The data sets for this study are available online at https://zenodo.org/record/8024901.

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Funding

This research has been supported by the Natural Science Foundation of China (U2040205, 52309090), Fundamental Research Funds for the Central Universities (B200203063), the National Key R&D Program of China (2019YFE0109900), the Water Science and Technology Project of Jiangsu Province (2021034, 2022057).

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Contributions

Conceptualization—Zhongtian Zhang; Guangqiu Jin—Methodology—Zhongtian Zhang; Hongwu Tang; Wenhui Shao—Formal analysis and investigation—Zhongtian Zhang; Qihao Jiang—Writing—original draft preparation—Zhongtian Zhang; Xiaorong Zhou—Writing—review and editing—Haiyu Yuan; Guangqiu Jin—Funding acquisition—Guangqiu Jin; Hongwu Tang—Resources—Guangqiu Jin; Hongwu Tang—Supervision—Guangqiu Jin; David Andrew Barry.

Corresponding author

Correspondence to Guangqiu Jin.

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Zhang, Z., Jin, G., Tang, H. et al. Effects of Hyporheic Exchange and Settlement on the Particle Size Distribution of Colloids. Transp Porous Med 151, 719–741 (2024). https://doi.org/10.1007/s11242-024-02061-4

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  • DOI: https://doi.org/10.1007/s11242-024-02061-4

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