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Biogeochemistry

, Volume 38, Issue 2, pp 189–205 | Cite as

Magnitude and variations of groundwater seepage along a Florida marine shoreline

  • JAYE E. CABLE
  • WILLIAM C. BURNETT
  • JEFFREY P. CHANTON
Article

Abstract

Direct groundwater inputs are receiving increasingattention as a potential source of nutrients and otherdissolved constituents to the coastal ocean. Seepageinto St. George Sound, Florida was measuredextensively from 1992 to 1994 using seepage meters. Spatial and temporal variations were documented alonga 7-km stretch of coastline and up to 1 km from shore. Measurements were made at 3 transects perpendicular toshore and 1 transect parallel to shore. The generalresults indicated that seepage decreased with distancefrom shore (2 of 3 transects), and substantialtemporal and spatial variability was observed inseepage flow from nearshore sediments. In addition,trends in mean monthly integrated seepage rates weresimilar to precipitation patterns measured at a nearbycoastal weather station. Based on these measurements, weestimate that the magnitude of groundwater seepage intothe study area is substantial, representing from 0.23 to4.4 m3 ⋅ sec-1of flow through the sediments, approximately equivalentto a first magnitude spring. Although it is unknown howrepresentative this region is with respect to globalgroundwater discharge, it demonstrates thatgroundwater flow can be as important as riverine andspring discharge in some cases. Our subsurfacedischarge rates suggest groundwater is an importanthydrologic source term for this region and may beimportant to the coastal biogeochemistry as well.

Keywords

Precipitation Geochemistry Temporal Variation Weather Station Spatial Variability 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • JAYE E. CABLE
    • 1
  • WILLIAM C. BURNETT
    • 2
  • JEFFREY P. CHANTON
    • 2
  1. 1.Department of Fisheries and Aquatic SciencesUniversity of FloridaGainesville
  2. 2.Department of OceanographyFlorida State UniversityTallahassee

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