Influence of Bedform Migration on Nitrate Reduction in Hyporheic Zones of Heterogeneous Sediments

Ping, Xue; Xian, Yang; Jin, Menggui

doi:10.1029/2022wr033258

Cited by 6 publications

(1 citation statement)

References 92 publications

(196 reference statements)

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“…Various studies have contradictory conceptualization of the redox boundary conditions of the HZ. For example, both oxic (Newcomer et al., 2018) and anoxic (Knights et al., 2017; Liu et al., 2017; Ping et al., 2023; Winnick, 2021) conditions have been assumed for the sediment lower boundary. Field studies indicate that both situations may be reasonable, depending on the observation depth (Krause et al., 2009).…”

Section: Introductionmentioning

confidence: 99%

Heterogeneity in Permeability and Particulate Organic Carbon Content Controls the Redox Condition of Riverbed Sediments at Different Timescales

Chen,

Guo,

Zhan

et al. 2024

Geophysical Research Letters

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The hydrological and biogeochemical properties of the hyporheic zone in stream and riverine ecosystems have been extensively studied over the past two decades. Although it is widely acknowledged that sediment heterogeneity can influence biogeochemical reactions, little effort has been made to understand the role of heterogeneity on the spatiotemporal variability of riverbed redox conditions under changing flow dynamics at different timescales. Here we integrate a mechanistic model and field data to demonstrate that heterogeneity in permeability plays a vital role in modulating sediment redox conditions at both seasonal (annual) and event (daily‐to‐weekly) timescales, whereas heterogeneity in particulate organic carbon (POC) content only has a comparable influence on redox conditions at the seasonal timescale. These findings underscore the importance of accurately characterizing sediment heterogeneity, in terms of permeability and POC content, in quantifying biogeochemical dynamics in the riverbed and hyporheic zones of riverine ecosystems.

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