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Evaluate the impact of hydrodynamic pressure on hydrologic exchange fluxes and resident time for a large-scale river section over a long-term period
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  • Jie Bao,
  • Yunxiang Chen,
  • Yilin Fang,
  • Xuehang Song,
  • William Perkins,
  • Zhuoran Duan,
  • Huiying Ren,
  • Zhangshuan Hou,
  • Marshall Richmond,
  • Xiaoliang He,
  • Timothy Scheibe
Jie Bao
Pacific Northwest National Laboratory
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Yunxiang Chen
Pacific Northwest National Laboratory
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Yilin Fang
Pacific Northwest National Laboratory
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Xuehang Song
PNNL
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William Perkins
Pacific Northwest National Laboratory
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Zhuoran Duan
Pacific Northwest National Laboratory
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Huiying Ren
Pacific Northwest National Laboratory
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Zhangshuan Hou
Pacific Northwest National Laboratory
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Marshall Richmond
Pacific Northwest National Laboratory
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Xiaoliang He
Pacific Northwest National Laboratory
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Timothy Scheibe
Pacific Northwest National Laboratory
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Abstract

Quantifying hydrologic exchange fluxes (HEF) and subsurface water residence times (RT) are important for managing the water quality and ecosystem health in dynamic river corridor systems. Laboratory-scale experiments and models have shown that hydrodynamic pressure variations on the riverbed induced by dynamic river flows can strongly impact HEFs and RTs. In this study, the impacts of hydrodynamic pressure on HEFs and RT for a 30 km section of the Columbia River in Washington State over a three-year period were quantitatively evaluated using a coupled transient three-dimensional (3D) multi-phase surface and subsurface water flow transport approach. Based on comparisons between model simulations with and without considering hydrodynamic pressure, we found that hydrodynamic pressure increase the net HEFs by 7% of flowing into river from subsurface domain, and also leads to a reduction of the area with long RT, and increase of area with short RT.

Peer review status:UNDER REVIEW

26 May 2021Submitted to Hydrological Processes
28 May 2021Assigned to Editor
28 May 2021Submission Checks Completed
28 May 2021Reviewer(s) Assigned
09 Jun 2021Review(s) Completed, Editorial Evaluation Pending