Influence of Net Groundwater Discharge on the Chemical Composition of a Coastal Environment: Flanders Bay, Long Island, New York
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- 作者：Daniel Montluç ; on and Sergio A. Sañ ; udo-Wilhelmy
- 刊名：Environmental Science & Technology
- 出版年：2001
- 出版时间：February 1, 2001
- 年：2001
- 卷：35
- 期：3
- 页码：480 - 486
- 全文大小：108K
- 年卷期：v.35,no.3(February 1, 2001)
- ISSN：1520-5851
文摘
Seasonal (October 1997 and May 1998) concentrations ofdissolved (<0.45 
m) trace metals (Ag, Al, Cd, Cu, Fe, Mn),inorganic nutrients (NO3, PO4, Si), DOC and DON weremeasured at seven wells during periods of low and highgroundwater flow, in the aquifer around Flanders Bay inEastern Long Island, New York. Similar measurementswere made in surface waters of Flanders Bay, a shallowcoastal embayment with restricted water flushing and riverinput. Dissolved constituents in the groundwater wereclassified according to their behavior under different flowconditions as follows: (1) peak during high flow (DOC,pH, Si, NO3, Al and Cu); (2) peak during low flow (salinity,DON, Ag, Cd, Mn); and (3) concentrations independentof flow conditions (PO4 and Fe). The primarily urban andagricultural land use on the North Fork of Long Island wasreflected in higher concentrations of nutrients, Cu andCd in groundwater, compared to samples from the SouthFork which is mostly open parkland. Principal componentanalysis indicated that groundwater seepage couldinfluence the chemical composition of Flanders Bay withrespect to the major geochemical carriers (e.g. Fe and Mn).However, mass balance estimates for Cu indicated that,during low flow conditions, net groundwater Cu input wasabout 10% of the total input. In contrast, during highflow, net groundwater flow could account for up to 58%of all Cu inputs. Nevertheless, a large imbalance, whichaccounted for up to 70% of the outflux during lowaquifer recharge, suggested that the Cu budget of theBay was not adequately described by the inputs considered(river, net groundwater flow, atmospheric deposition,and tidal exchange). Important missing components of theCu mass balance in Flanders Bay may include groundwatercirculation driven by tides and waves as well as diffusivebenthic fluxes.
m) trace metals (Ag, Al, Cd, Cu, Fe, Mn),inorganic nutrients (NO3, PO4, Si), DOC and DON weremeasured at seven wells during periods of low and highgroundwater flow, in the aquifer around Flanders Bay inEastern Long Island, New York. Similar measurementswere made in surface waters of Flanders Bay, a shallowcoastal embayment with restricted water flushing and riverinput. Dissolved constituents in the groundwater wereclassified according to their behavior under different flowconditions as follows: (1) peak during high flow (DOC,pH, Si, NO3, Al and Cu); (2) peak during low flow (salinity,DON, Ag, Cd, Mn); and (3) concentrations independentof flow conditions (PO4 and Fe). The primarily urban andagricultural land use on the North Fork of Long Island wasreflected in higher concentrations of nutrients, Cu andCd in groundwater, compared to samples from the SouthFork which is mostly open parkland. Principal componentanalysis indicated that groundwater seepage couldinfluence the chemical composition of Flanders Bay withrespect to the major geochemical carriers (e.g. Fe and Mn).However, mass balance estimates for Cu indicated that,during low flow conditions, net groundwater Cu input wasabout 10% of the total input. In contrast, during highflow, net groundwater flow could account for up to 58%of all Cu inputs. Nevertheless, a large imbalance, whichaccounted for up to 70% of the outflux during lowaquifer recharge, suggested that the Cu budget of theBay was not adequately described by the inputs considered(river, net groundwater flow, atmospheric deposition,and tidal exchange). Important missing components of theCu mass balance in Flanders Bay may include groundwatercirculation driven by tides and waves as well as diffusivebenthic fluxes.