globalchange  > 气候减缓与适应
DOI: 10.1002/2017JC013008
Scopus记录号: 2-s2.0-85041575407
论文题名:
Coupling End-Member Mixing Analysis and Isotope Mass Balancing (222-Rn) for Differentiation of Fresh and Recirculated Submarine Groundwater Discharge Into Knysna Estuary, South Africa
作者: Petermann E.; Knöller K.; Rocha C.; Scholten J.; Stollberg R.; Weiß H.; Schubert M.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:2
起始页码: 952
结束页码: 970
语种: 英语
英文关键词: end-member mixing analysis ; isotopes ; Knysna ; radon ; submarine groundwater discharge ; water balance
Scopus关键词: coastal water ; estuarine pollution ; freshwater ; groundwater pollution ; heavy metal ; mixing ratio ; organic compound ; pollutant transport ; radon isotope ; river discharge ; seawater ; tidal cycle ; underwater environment ; vulnerability ; water budget ; Knysna Estuary ; South Africa ; Western Cape
英文摘要: Quantification of submarine groundwater discharge (SGD) is essential for evaluating the vulnerability of coastal water bodies to groundwater pollution and for understanding water body material cycles response due to potential discharge of nutrients, organic compounds, or heavy metals. Here we present an environmental tracer-based methodology for quantifying SGD into Knysna Estuary, South Africa. Both components of SGD, (1) fresh, terrestrial (FSGD) and (2) saline, recirculated (RSGD), were differentiated. We conducted an end-member mixing analysis for radon (222Rn) and salinity time series of estuary water over two tidal cycles to determine fractions of seawater, riverwater, FSGD, and RSGD. The mixing analysis was treated as a constrained optimization problem for finding the end-member mixing ratio that is producing the best fit to observations at every time step. Results revealed highest FSGD and RSGD fractions in the estuary during peak low tide. Over a 24 h time series, the portions of FSGD and RSGD in the estuary water were 0.2% and 0.8% near the estuary mouth and the FSGD/RSGD ratio was 1:3.3. We determined a median FSGD of 41,000 m³ d−1 (1.4 m³ d−1 per m shoreline) and a median RSGD of 135,000 m³ d−1 (4.5 m³ d−1 per m shoreline) which suggests that SGD exceeds river discharge by a factor of 1.0–2.1. By comparison to other sources, this implies that SGD is responsible for 28–73% of total DIN fluxes into Knysna Estuary. © 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/114549
Appears in Collections:气候减缓与适应

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作者单位: Department Groundwater Remediation, Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany; Department Catchment Hydrology, Helmholtz Centre for Environmental Research – UFZ, Halle, Germany; Biogeochemistry Research Group, School of Natural Sciences, Geography Department, Trinity College Dublin, Dublin, Ireland; Department of Sedimentology, Coastal and Shelf Research, Institute of Geosciences, University of Kiel, Kiel, Germany

Recommended Citation:
Petermann E.,Knöller K.,Rocha C.,et al. Coupling End-Member Mixing Analysis and Isotope Mass Balancing (222-Rn) for Differentiation of Fresh and Recirculated Submarine Groundwater Discharge Into Knysna Estuary, South Africa[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)
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