Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/2014WR016593 |
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
![]() |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。