Arid
DOI10.1002/2014WR016593
Mixing effects on nitrogen and oxygen concentrations and the relationship to mean residence time in a hyporheic zone of a riffle-pool sequence
Naranjo, Ramon C.1; Niswonger, Richard G.1; Davis, Clinton J.2
通讯作者Naranjo, Ramon C.
来源期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2015
卷号51期号:9页码:7202-7217
英文摘要

Flow paths and residence times in the hyporheic zone are known to influence biogeochemical processes such as nitrification and denitrification. The exchange across the sediment-water interface may involve mixing of surface water and groundwater through complex hyporheic flow paths that contribute to highly variable biogeochemically active zones. Despite the recognition of these patterns in the literature, conceptualization and analysis of flow paths and nitrogen transformations beneath riffle-pool sequences often neglect to consider bed form driven exchange along the entire reach. In this study, the spatial and temporal distribution of dissolved oxygen (DO), nitrate (NO3-) and ammonium (NH4+) were monitored in the hyporheic zone beneath a riffle-pool sequence on a losing section of the Truckee River, NV. Spatially varying hyporheic exchange and the occurrence of multi-scale hyporheic mixing cells are shown to influence concentrations of DO and NO3- and the mean residence time (MRT) of riffle and pool areas. Distinct patterns observed in piezometers are shown to be influenced by the first large flow event following a steady 8 month period of low flow conditions. Increases in surface water discharge resulted in reversed hydraulic gradients and production of nitrate through nitrification at small vertical spatial scales (0.10-0.25 m) beneath the sediment-water interface. In areas with high downward flow rates and low MRT, denitrification may be limited. The use of a longitudinal two-dimensional flow model helped identify important mechanisms such as multi-scale hyporheic mixing cells and spatially varying MRT, an important driver for nitrogen transformation in the riverbed. Our observations of DO and NO3- concentrations and model simulations highlight the role of multi-scale hyporheic mixing cells on MRT and nitrogen transformations in the hyporheic zone of riffle-pool sequences.


英文关键词hyporheic zone nitrogen reactions mixing mean residence time
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000363391300017
WOS关键词DESERT STREAM ECOSYSTEM ; VERTICAL HYDROLOGIC EXCHANGE ; SUBSURFACE WATER EXCHANGE ; SURFACE-WATER ; MOUNTAIN STREAM ; RIPARIAN ZONES ; HOT MOMENTS ; BED FORMS ; GROUNDWATER ; NITRATE
WOS类目Environmental Sciences ; Limnology ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/190795
作者单位1.US Geol Survey, Carson City, NV 89701 USA;
2.Univ Nevada, Dept Nat Resources & Environm Sci, Reno, NV 89557 USA
推荐引用方式
GB/T 7714
Naranjo, Ramon C.,Niswonger, Richard G.,Davis, Clinton J.. Mixing effects on nitrogen and oxygen concentrations and the relationship to mean residence time in a hyporheic zone of a riffle-pool sequence[J]. United States Geological Survey,2015,51(9):7202-7217.
APA Naranjo, Ramon C.,Niswonger, Richard G.,&Davis, Clinton J..(2015).Mixing effects on nitrogen and oxygen concentrations and the relationship to mean residence time in a hyporheic zone of a riffle-pool sequence.WATER RESOURCES RESEARCH,51(9),7202-7217.
MLA Naranjo, Ramon C.,et al."Mixing effects on nitrogen and oxygen concentrations and the relationship to mean residence time in a hyporheic zone of a riffle-pool sequence".WATER RESOURCES RESEARCH 51.9(2015):7202-7217.
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