气候变化领域集成服务门户(CCPortal): Nitrate Removal Within Heterogeneous Riparian Aquifers Under Tidal Influence

CCPortal

DOI	10.1029/2019GL085699
	Nitrate Removal Within Heterogeneous Riparian Aquifers Under Tidal Influence
	Wallace C.D.; Sawyer A.H.; Soltanian M.R.; Barnes R.T.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:10
英文摘要	Tides in coastal rivers drive river-groundwater (hyporheic) exchange and provide opportunities for nitrate removal that may improve coastal water quality. Silt and sand layers in coastal floodplain sediments can alter the flow and transformation of nitrate. Our goal was to understand how sediment heterogeneity influences nitrogen dynamics near tidal rivers. Numerical simulations show that oxic, variably saturated sand layers and anoxic, organic-rich silt layers are sites of nitrification and denitrification, respectively. The exchange of river water and nitrate through heterogeneous sediments increases with sand fraction, as sand lenses become longer and more connected. The amount of nitrate removed from river water also increases but represents a smaller portion of total nitrate exchange through the hyporheic zone, causing removal efficiency to decline. Our results suggest that accurate characterization of aquifer heterogeneity leads to an improved understanding of sites of nutrient transformation within floodplain sediments. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Aquifers; Banks (bodies of water); Floods; Groundwater resources; Hydrogeology; Nitrates; Rivers; Sand; Sediments; Silt; Stream flow; Water quality; Aquifer heterogeneity; Coastal water quality; Floodplain sediments; Heterogeneous sediments; Nitrification and denitrification; Nutrient transformations; Removal efficiencies; Variably saturated; Nitrogen removal; aquifer; coastal water; coastal zone; floodplain; hyporheic zone; nitrate; nitrification; pollutant removal; riparian zone; river water
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170320
作者单位	School of Earth Sciences, The Ohio State University, Columbus, OH, United States; Departments of Geology and Environmental Engineering, University of Cincinnati, Cincinnati, OH, United States; Environmental Studies Program, Colorado College, Colorado Springs, CO, United States
推荐引用方式 GB/T 7714	Wallace C.D.,Sawyer A.H.,Soltanian M.R.,et al. Nitrate Removal Within Heterogeneous Riparian Aquifers Under Tidal Influence[J],2020,47(10).
APA	Wallace C.D.,Sawyer A.H.,Soltanian M.R.,&Barnes R.T..(2020).Nitrate Removal Within Heterogeneous Riparian Aquifers Under Tidal Influence.Geophysical Research Letters,47(10).
MLA	Wallace C.D.,et al."Nitrate Removal Within Heterogeneous Riparian Aquifers Under Tidal Influence".Geophysical Research Letters 47.10(2020).