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Vertical fluid flux in the hyporheic zone: field investigation, model, and comparative analysis

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Abstract

The hyporheic zone (HZ) is a saturated sediment layer connecting groundwater (GW) and surface water (SW) along a riverbed and river channel. The HZ plays an important role in connecting SW and GW in a river ecosystem, thereby helping maintain the ecological health of rivers. Studies on the HZ have therefore increased in many disciplines. This study used the VFLUX 2 software to assess vertical fluid flux in the HZ, in which the Hatch, Kerry, McCallum, and Luce models were applied and compared. The simulations were calibrated against data measured by the US Geological Survey at a water diversion channel within the Walker River Basin in Nevada. Using COMSOL Multiphysics, we developed a two-dimensional coupled numerical model of the saturated seepage and temperature fields, calibrated against measured temperature data. We also determined the vertical seepage velocity and compared the simulations with those of the analytical models in VFLUX 2. The results showed that the temperature field distribution of the HZ is obviously nonuniform in space. With a deeper monitoring point, the thermal response of each temperature measurement pointed to periodic temperature fluctuations of the SW, which exhibited attenuation and hysteresis characteristics. When the vertical flow velocity of GW was sufficiently large, an error in the accuracy of the Kerry model amplitude ratio was observed, regardless of the heat dispersion coefficient used. Under conditions of local GW recharge by SW and a heterogeneous permeability coefficient, the use of the amplitude ratio method is recommended to quantify the vertical GW flow rate in the HZ.

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Acknowledgments

We are grateful to the US Geological Survey of Nevada for sharing the data needed in this study. We thank the precious suggestions by anonymous reviewers and editors, which have greatly helped in the improvement of the paper.

Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 51679194, 51509014), the Planning Project of Science and Technology of Water Resources of Shaanxi (Grant No. 2019slkj-12), and the State Key Laboratory of Eco-hydraulics in Northwest Arid Region (Xi’an University of Technology) (Grant No. 2019KJCXTD-10).

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Correspondence to Jie Ren.

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The authors declare that they have no conflict of interest.

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Responsible Editor: Tajudeen Iwalewa

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Ren, J., Cheng, J., Zhang, W. et al. Vertical fluid flux in the hyporheic zone: field investigation, model, and comparative analysis. Arab J Geosci 13, 9 (2020). https://doi.org/10.1007/s12517-019-4990-z

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  • DOI: https://doi.org/10.1007/s12517-019-4990-z

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