globalchange  > 气候减缓与适应
DOI: 10.1002/2017JC013568
Scopus记录号: 2-s2.0-85043371352
论文题名:
Variability in Benthic Exchange Rate, Depth, and Residence Time Beneath a Shallow Coastal Estuary
作者: Russoniello C.J.; Heiss J.W.; Michael H.A.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:3
起始页码: 1860
结束页码: 1876
语种: 英语
英文关键词: benthic exchange ; coastal groundwater ; Delaware Inland Bays ; hypokymatic flow ; submarine groundwater discharge ; tides and currents ; USA ; waves
Scopus关键词: Acoustic Doppler Current Profiler ; aquifer ; chemical reaction ; coastal water ; coastal zone ; estuarine environment ; exchange rate ; flow modeling ; groundwater ; groundwater flow ; hydrodynamics ; inland sea ; residence time ; surface water ; water column ; water depth ; water exchange ; Delaware Bay ; Rocky Mountains ; Sierra Madre [United States] ; United States
英文摘要: Hydrodynamically driven benthic exchange of water between the water column and shallow seabed aquifer is a significant and dynamic component of coastal and estuarine fluid budgets. Associated exchange of solutes promotes ecologically important chemical reactions, so quantifying benthic exchange rates, depths, and residence times constrains coastal chemical cycling estimates. We present the first combined field, numerical, and analytical modeling investigation of wave-induced exchange. Temporal variability of exchange was calculated with data collected by instruments deployed in a shallow estuary for 11 days. Differential pressure sensors recorded pressure gradients across the seabed, and up- and down-looking ADCPs recorded currents and pressures to determine wave parameters, surface-water currents, and water depth. Wave-induced exchange was calculated (1) directly from differential pressure measurements, and indirectly with an analytical model based on wave parameters from (2) ADCP and (3) wind data. Wave-induced exchange from pressure measurements and ADCP-measured wave parameters matched well, but both exceeded wind-based values. Exchange induced by tidal pumping and current-bed form interaction—the other primary drivers in shallow coastal waters were calculated from tidal stage variation and ADCP-measured currents. Exchange from waves (mean = 20.0 cm/d; range = 1.75–92.3 cm/d) greatly exceeded exchange due to tides (mean = 3.7 cm/d) and current-bed form interaction (mean = 6.5 × 10−2 cm/d). Groundwater flow models showed aquifer properties affect wave-driven benthic exchange: residence time and depth increased and exchange rates decreased with increasing hydraulic diffusivity (ratio of aquifer permeability to compressibility). This new understanding of benthic exchange will help managers assess its control over chemical fluxes to marine systems. © 2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114351
Appears in Collections:气候减缓与适应

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作者单位: Department of Geological Sciences, University of Delaware, Newark, DE, United States; Now at Department of Earth Sciences, Syracuse University, Syracuse, NY, United States; Now at The National Academy of Sciences, Washington, DC, United States; Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, United States

Recommended Citation:
Russoniello C.J.,Heiss J.W.,Michael H.A.. Variability in Benthic Exchange Rate, Depth, and Residence Time Beneath a Shallow Coastal Estuary[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(3)
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