期刊
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
卷 120, 期 3, 页码 538-548出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JG002852
关键词
permeable sediments; denitrification; hyporheic zone; reactive transport; migrating bed forms; groundwater hydrology
资金
- Australian Research Council [LP0991254, DP1096457]
- Melbourne Water Corporation
- Environment Protection Authority Victoria
- Monash University Sir James McNeil Foundation Postgraduate Research Scholarship
- U.S. National Science Foundation CAREER grant [EAR-0955750]
- Australian Research Council [LP0991254, DP1096457] Funding Source: Australian Research Council
- Directorate For Geosciences
- Division Of Earth Sciences [0955750] Funding Source: National Science Foundation
Bed form celerity, the migration rate of ripples along a sediment bed, has previously been shown to have dramatic effects on oxygen distribution and transport within the hyporheic zone of permeable sediments. This has the potential to influence denitrification ratesin particular by increasing the coupling of nitrification and denitrification. To further understand this, we numerically modeled nitrogen cycling under migrating ripples. While the simulated oxygen profiles match with expected behavior, almost no effect on denitrification or coupled nitrification-denitrification was observed with increasing celerity. Instead, denitrification rates were dominantly controlled by the flow velocity of water overlying the sediment. Key Points
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