Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR024198 |
Effect of Surface Water Stage Fluctuation on Mixing-Dependent Hyporheic Denitrification in Riverbed Dunes | |
Hester, Erich T.; Eastes, Lauren A.; Widdowson, Mark A. | |
2019-06-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:6页码:4668-4687 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The hyporheic zone, where surface water (SW) and groundwater (GW) interact in shallow sediments beneath rivers, is uniquely reactive and attenuates pollutants. Mixing of reactants from SW and GW enables mixing-dependent (MD) reactions, which may be the last opportunity for GW contaminants to react before entering SW. Yet little is known about hyporheic MD reactions, particularly how they respond to daily or seasonal SW fluctuations or sediment heterogeneity. We used MODFLOW and SEAM3D to simulate non-mixing-dependent (NMD) aerobic respiration and MD denitrification in a riverbed dune with nitrate from SW and dissolved organic carbon from GW. We varied SW heads and heterogeneity of sediment hydraulic conductivity. For longer-term fluctuations (i.e., seasons), increasing SW depth from 0.1 to 1.0 m increased NMD aerobic respiration by 270% and MD denitrification by 78% in homogeneous sediment. MD reactions thus were controlled by mixing zone length or size and would be stronger when SW stage is elevated, for example, during wintertime. Adding sediment heterogeneity to the long-term scenarios, particularly by increasing hydraulic conductivity correlation length, increased flow focusing and consequently increased MD denitrification by 20-30%. By contrast, the net effect of daily SW fluctuations on MD denitrification in homogeneous sediment was minor. In sum, SW fluctuations are an important control on hyporheic MD reactions, primarily by controlling mixing zone length. The hyporheic zone may attenuate nitrate in upwelling GW plumes, but temporal fluctuations may be considerable as quantified above. |
英文关键词 | river stream nitrogen oxygen hyporheic zone hyporheic exchange |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000477616900010 |
WOS关键词 | IN-STREAM STRUCTURES ; NONSORBING SOLUTES ; INSET FLOODPLAINS ; RESIDENCE TIMES ; ZONE ; EXCHANGE ; GROUNDWATER ; FLOW ; TRANSPORT ; DISCHARGE |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183964 |
专题 | 资源环境科学 |
作者单位 | Virginia Tech, Dept Civil & Environm Engn, Blacksburg, VA 24061 USA |
推荐引用方式 GB/T 7714 | Hester, Erich T.,Eastes, Lauren A.,Widdowson, Mark A.. Effect of Surface Water Stage Fluctuation on Mixing-Dependent Hyporheic Denitrification in Riverbed Dunes[J]. WATER RESOURCES RESEARCH,2019,55(6):4668-4687. |
APA | Hester, Erich T.,Eastes, Lauren A.,&Widdowson, Mark A..(2019).Effect of Surface Water Stage Fluctuation on Mixing-Dependent Hyporheic Denitrification in Riverbed Dunes.WATER RESOURCES RESEARCH,55(6),4668-4687. |
MLA | Hester, Erich T.,et al."Effect of Surface Water Stage Fluctuation on Mixing-Dependent Hyporheic Denitrification in Riverbed Dunes".WATER RESOURCES RESEARCH 55.6(2019):4668-4687. |
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