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Fluxes of water and solute in a coastal wetland sediment. l. The contribution of regional groundwater discharge

January 1, 1995

Upward discharge of fresh groundwater into a mid-Atlantic intertidal wetland contributed 62% of the water needed to replace evapotranspiration losses from the sediment during an 11 day period in September. Infiltration during flooding by tides provided most of the balance; thus there was a net advection of salt into the sediment. The amount of groundwater discharge was estimated from changes in water storage in the sediment, as inferred from measurements of hydraulic head made every 10 min. We argue that this approach is inherently more accurate than calculating the flux as the product of hydraulic conductivity and head gradient. Evapotranspiration was estimated from direct measurements of net radiation. On an annual time-scale, our results suggest that groundwater discharge at this site may exceed the evapotranspiration flux during months of reduced evapotranspiration. Should this occur, groundwater-driven advection would supplement diffusion, during flooding, in removing salt from the sediment.

Citation Information

Publication Year 1995
Title Fluxes of water and solute in a coastal wetland sediment. l. The contribution of regional groundwater discharge
DOI 10.1016/0022-1694(94)02561-O
Authors William K. Nuttle, Judson W. Harvey
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Hydrology
Series Number
Index ID 70185368
Record Source USGS Publications Warehouse
USGS Organization Toxic Substances Hydrology Program

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