气候变化领域集成服务门户(CCPortal): Denitrification hotspots in intertidal mixing zones linked to geologic heterogeneity

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DOI	10.1088/1748-9326/ab90a6
	Denitrification hotspots in intertidal mixing zones linked to geologic heterogeneity
	Heiss J.W.; Michael H.A.; Koneshloo M.
发表日期	2020
ISSN	17489318
卷号	15 期号:8
英文摘要	The mixing between fresh and saline groundwater in beach aquifers promotes biogeochemical transformations that affect nutrient fluxes to the coastal ocean. We performed variable-density groundwater flow and reactive transport simulations with geostatistical representations of sedimentary structure to understand the influence of heterogeneity on groundwater dynamics and denitrification in intertidal mixing zones. Ensemble-averaged simulation results show that heterogeneity can enhance mixing between fresh and saline groundwater and increase residence time, resulting in up to 80% higher nitrate removal relative to equivalent effective homogeneous aquifer sediment. Denitrification hotspots form in high permeability structures where DOC and nitrate are readily supplied by convergent flow. The results provide a physical explanation for the formation of denitrification hotspots observed in beach aquifers and illustrate for the first time the influence of sediment heterogeneity on rates and spatial patterns of biogeochemical processes in intertidal aquifers that are critical mediators of land-sea solute fluxes along world coastlines. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	beach aquifer; biogeochemistry; coastal groundwater; heterogeneity; submarine groundwater discharge
语种	英语
scopus关键词	Aquifers; Beaches; Biogeochemistry; Denitrification; Groundwater flow; Hydrogeology; Mixing; Nitrates; Nitrogen removal; Sedimentology; Biogeochemical process; Ensemble-averaged; Geologic heterogeneity; Groundwater dynamics; High permeability; Reactive transport; Saline groundwater; Sedimentary structure; Groundwater resources; aquifer; biogeochemical cycle; denitrification; groundwater flow; nitrate; pollutant removal; reactive transport; residence time; sedimentary structure; simulation
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153885
作者单位	Department of Environmental, Earth and Atmospheric Sciences, University of Massachusetts Lowell, Lowell, MA, United States; Department of Earth Geological Sciences, University of Delaware, Newark, DE, United States; Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, United States; W.D. von Gonten and Co. Laboratories, Houston, TX, United States
推荐引用方式 GB/T 7714	Heiss J.W.,Michael H.A.,Koneshloo M.. Denitrification hotspots in intertidal mixing zones linked to geologic heterogeneity[J],2020,15(8).
APA	Heiss J.W.,Michael H.A.,&Koneshloo M..(2020).Denitrification hotspots in intertidal mixing zones linked to geologic heterogeneity.Environmental Research Letters,15(8).
MLA	Heiss J.W.,et al."Denitrification hotspots in intertidal mixing zones linked to geologic heterogeneity".Environmental Research Letters 15.8(2020).