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Event-Driven Hyporheic Exchange during Single and Seasonal Rainfall in a Gaining Stream

Author

Listed:
  • Chengpeng Lu

    (Hohai University)

  • Keyan Ji

    (Hohai University)

  • Yong Zhang

    (University of Alabama)

  • Jan H. Fleckenstein

    (Helmholtz Center for Environmental Research, UFZ)

  • Chunmiao Zheng

    (Southern University of Science and Technology)

  • Kate Salsky

    (University of Alabama)

Abstract

This study combined a reach-scale field survey and numerical modelling analysis to reveal the pattern of transient hyporheic exchange driven by rainfall events in the Zhongtian River, Southeast China. Field observations revealed hydrodynamic properties and flux variations in surface water (SW)/ groundwater (GW), suggesting that the regional groundwater recharged the study reach. A two-step numerical modelling procedure, including a hydraulic surface flow model and a groundwater flow model, was then used to interpret the transient hyporheic flow system. The hyporheic exchange exhibited strong temporal evolution in the study reach, as indicated by the rainfall event-driven hyporheic exchange. The reversal of the hydraulic gradient and transient hyporheic exchange were simulated using numerical simulation. Anisotropic hydraulic conductivity is the key to generating transient hyporheic exchange. A revised conceptual model was used to interpret the observed temporal patterns in hyporheic exchange. The seasonal rainfall events generate transient hyporheic exchange, and the pattern of transient hyporheic exchange indicates that transient hyporheic exchange appears only after an increased phase of the river stage but does not last long. The temporal pattern of hyporheic exchange can significantly affect the hydrodynamic exchange and the evolution of hydrology in the hyporheic zone for a gaining stream, and these results have important guiding significance for the comprehensive management of surface water and groundwater quantity and quality.

Suggested Citation

  • Chengpeng Lu & Keyan Ji & Yong Zhang & Jan H. Fleckenstein & Chunmiao Zheng & Kate Salsky, 2020. "Event-Driven Hyporheic Exchange during Single and Seasonal Rainfall in a Gaining Stream," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 34(15), pages 4617-4631, December.
    • Handle: RePEc:spr:waterr:v:34:y:2020:i:15:d:10.1007_s11269-020-02678-2
    DOI: 10.1007/s11269-020-02678-2
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    Cited by:

    1. Chengpeng Lu & Keyan Ji & Wanjie Wang & Yong Zhang & Tema Koketso Ealotswe & Wei Qin & Jiayun Lu & Bo Liu & Longcang Shu, 2021. "Estimation of the Interaction Between Groundwater and Surface Water Based on Flow Routing Using an Improved Nonlinear Muskingum-Cunge Method," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(8), pages 2649-2666, June.

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