Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020610 |
Denitrification in the banks of fluctuating rivers: The effects of river stage amplitude, sediment hydraulic conductivity and dispersivity, and ambient groundwater flow | |
Shuai, Pin1; Cardenas, M. Bayani2; Knappett, Peter S. K.1; Bennett, Philip C.2; Neilson, Bethany T.3 | |
2017-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Hyporheic exchange induced by periodic river fluctuations leads to important biogeochemical processes, particularly nitrogen cycling, in riparian zones (RZs) where chemically distinct surface water and groundwater mix. We developed a two-dimensional coupled flow, reactive transport model to study the role of bank storage induced by river fluctuations on removing river-borne nitrate. Sensitivity analyses were conducted to quantify the effects of river amplitude, sediment hydraulic conductivity and dispersivity, and ambient groundwater flow on nitrate removal rate. The simulations showed that nitrification occurred in the shallower zone adjacent to the bank where oxic river water and groundwater interacted while denitrification occurred deeper into the aquifer and in the riverbed sediments where oxygen was depleted. River fluctuations greatly increased the amount of nitrate being removed; the nitrate removal rate increased as river amplitude increased. Similarly, increasing hydraulic conductivity increased overall nitrate removal since it expanded the denitrifying zone but decreased efficiency. In contrast, increasing sediment dispersivity increased the removal efficiency of nitrate because it promoted mixing between electron acceptors and donors. The presence and direction of ambient groundwater flow had a significant impact on nitrate removal rate when compared to neutral conditions. A losing river showed a larger nitrate removal rate, whereas a gaining river showed a smaller nitrate removal rate. Our results demonstrated that daily river fluctuations created denitrification hot spots within the RZ that would not otherwise exist under naturally neutral or gaining conditions. |
英文关键词 | riparian zone denitrification numerical modeling river fluctuation riverbank aquifer dam regulation |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413484200026 |
WOS关键词 | INDUCED HYPORHEIC ZONES ; FRESH-WATER ZONE ; NUMERICAL-SIMULATION ; PERMEABLE SEDIMENTS ; TRANSPORT MODEL ; ORGANIC-CARBON ; RIPARIAN ZONE ; POROUS-MEDIA ; BED RIVER ; NUTRIENT |
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/21902 |
专题 | 资源环境科学 |
作者单位 | 1.Texas A&M Univ, Dept Geol & Geophys, College Stn, TX 77843 USA; 2.Univ Texas Austin, Dept Geol Sci, Austin, TX USA; 3.Utah State Univ, Utah Water Res Lab, Civil & Environm Engn, Logan, UT 84322 USA |
推荐引用方式 GB/T 7714 | Shuai, Pin,Cardenas, M. Bayani,Knappett, Peter S. K.,et al. Denitrification in the banks of fluctuating rivers: The effects of river stage amplitude, sediment hydraulic conductivity and dispersivity, and ambient groundwater flow[J]. WATER RESOURCES RESEARCH,2017,53(9). |
APA | Shuai, Pin,Cardenas, M. Bayani,Knappett, Peter S. K.,Bennett, Philip C.,&Neilson, Bethany T..(2017).Denitrification in the banks of fluctuating rivers: The effects of river stage amplitude, sediment hydraulic conductivity and dispersivity, and ambient groundwater flow.WATER RESOURCES RESEARCH,53(9). |
MLA | Shuai, Pin,et al."Denitrification in the banks of fluctuating rivers: The effects of river stage amplitude, sediment hydraulic conductivity and dispersivity, and ambient groundwater flow".WATER RESOURCES RESEARCH 53.9(2017). |
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