Drought Conditions Maximize the Impact of High-Frequency Flow Variations on Thermal Regimes and Biogeochemical Function in the Hyporheic Zone

Song, Xuehang; Chen, Xingyuan; Stegen, James C.; Hammond, Glenn; Song, Hyun ‐Seob; Dai, Heng; Graham, Emily B.; Zachara, John M.

doi:10.1029/2018WR022586

Title: Drought Conditions Maximize the Impact of High-Frequency Flow Variations on Thermal Regimes and Biogeochemical Function in the Hyporheic Zone

Journal Article · 19 September 2018 · Water Resources Research

DOI: https://doi.org/10.1029/2018WR022586 · OSTI ID:1529988

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Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Anthropogenic activities, such as dam operations, often induce larger and more frequent stage fluctuations than those occurring in natural rivers. However, the long-term impact of such flow variations on thermal and biogeochemical dynamics of the associated hyporheic zone (HZ) is poorly understood. A heterogeneous, two-dimensional thermo-hydro-biogeochemical model revealed an important interaction between high-frequency flow variations and watershed-scale hydrology. High-frequency stage fluctuations had their strongest thermal and biogeochemical impacts when the mean river stage was low during fall and winter. An abnormally thin snowpack in 2015, however, created a low river stage during summer and early fall, whereby high-frequency stage fluctuations caused the HZ to be warmer than usual. Furthermore, this study provided the scientific basis to assess the potential ecological consequences of the high-frequency flow variations in a regulated river, as well as guidance on how to maximize the potential benefits—or minimize the drawbacks—of river regulation to river ecosystems.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830; BER SBR SFA; AC05‐76RL01830; AC02‐05CH11231

OSTI ID:: 1529988

Alternate ID(s):: OSTI ID: 1476382

Report Number(s):: PNNL-SA-123922

Journal Information:: Water Resources Research, Vol. 54, Issue 10; ISSN 0043-1397

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 46 works

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