Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR024221 |
Modeling Influence of Sediment Heterogeneity on Nutrient Cycling in Streambeds | |
Pescimoro, Eugenio1,2; Boano, Fulvio1; Sawyer, Audrey H.3; Soltanian, Mohamad Reza4,5 | |
2019-05-01 | |
发表期刊 | WATER RESOURCES RESEARCH
![]() |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:5页码:4082-4095 |
文章类型 | Article |
语种 | 英语 |
国家 | Italy; England; USA |
英文摘要 | Rivers and their hyporheic zones play an important role in nutrient cycling. The fate of dissolved inorganic nitrogen is governed by reactions that occur in the water column and streambed sediments. Sediments are heterogeneous both in term of physical (e.g., hydraulic conductivity) and chemical (e.g., organic carbon content) properties, which influence water residence times and biogeochemical reactions. Yet few modeling studies have explored the effects of both physical and chemical heterogeneity on nutrient transport in the hyporheic zone. In this study, we simulated hyporheic exchange in physically and chemically heterogeneous sediments with binary distributions of sand and silt in a low-gradient meandering river. We analyzed the impact of different silt/sand patterns on dissolved organic carbon, oxygen, nitrate, and ammonium. Our results show that streambeds with a higher volume proportion of silt exhibit lower hyporheic exchange rates but more efficient nitrate removal along flow paths compared to predominantly sandy streambeds. The implication is that hyporheic zones with a mixture of inorganic sands and organic silts have a high capacity to remove nitrate, despite their moderate permeabilities. Plain Language Summary With the advent of intensive cultivation and livestock farms, nutrient contamination has increased in streams. Microbial communities in streambeds reduce nitrate, effectively removing it from streams. However, quantifying this removal is difficult because it is influenced by many spatially variable factors, among which sediment type plays an important role. Streambeds can contain both sandy and silty sediments distributed in complex patterns. The present study employs computer simulations to analyze how nitrate is removed in a mixture of different streambed sediments. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000474848500026 |
WOS关键词 | HYPORHEIC ZONE ; DENITRIFICATION ; NITROGEN ; GROUNDWATER ; TRANSPORT ; NITRATE ; FLOW ; PERMEABILITY ; PATTERNS ; EXCHANGE |
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/183134 |
专题 | 资源环境科学 |
作者单位 | 1.Politecn Torino, Dept Environm Land & Infrastruct Engn, Turin, Italy; 2.Univ Nottingham, Sch Math Sci, Nottingham, England; 3.Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA; 4.Univ Cincinnati, Dept Geol, Cincinnati, OH USA; 5.Univ Cincinnati, Dept Environm Engn, Cincinnati, OH USA |
推荐引用方式 GB/T 7714 | Pescimoro, Eugenio,Boano, Fulvio,Sawyer, Audrey H.,et al. Modeling Influence of Sediment Heterogeneity on Nutrient Cycling in Streambeds[J]. WATER RESOURCES RESEARCH,2019,55(5):4082-4095. |
APA | Pescimoro, Eugenio,Boano, Fulvio,Sawyer, Audrey H.,&Soltanian, Mohamad Reza.(2019).Modeling Influence of Sediment Heterogeneity on Nutrient Cycling in Streambeds.WATER RESOURCES RESEARCH,55(5),4082-4095. |
MLA | Pescimoro, Eugenio,et al."Modeling Influence of Sediment Heterogeneity on Nutrient Cycling in Streambeds".WATER RESOURCES RESEARCH 55.5(2019):4082-4095. |
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。
修改评论