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1 December 2003 TRANSIENT GEOMORPHIC CONTROL OF WATER TABLE AND HYDRAULIC HEAD REVERSALS IN A COASTAL FRESHWATER PEATLAND
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Abstract

We studied a Great Lakes peatland protected by a barrier dune system to test the hypothesis that changes in the morphology of a barrier beach alter the wetland surface-water and ground-water hydrology such that the plant rooting zone in the wetland interior might be affected. Hydraulic head measured in observation wells located on transects perpendicular to a flow-through channel, uplands, and Lake Ontario were compared to lake-level changes, weather patterns, and the temporal conditions of the barrier beach. Water-table elevations within the wetland complex always remained 0.35 to 0.84 m above Lake Ontario's water level (mean difference = 0.62 m) and did not fluctuate in parallel with changes in the lake's water level. Flooding events occurred when breaches closed and isolated the wetland complex from Lake Ontario; daily average water levels rose between 0.06 m and 0.27 m. When the barrier beach was breached naturally or by human activity, daily average water-table elevations in the wetland receded between 0.16 m and 0.41 m. During the growing season, vertical ground-water-flow directions also changed as a function of changing hydraulics controlled by the barrier beach. Vertical recharge-discharge gradients ranged from −0.2 to 0.1 m·m−1. Water-table elevation and hydraulic head gradients across the study area were controlled primarily by short-term (days to weeks) changes in shoreline geomorphology, whereas seasonal weather patterns and Lake Ontario water-level fluctuations imposed secondary controls on the ground-water-flow regime.

Kathleen M. Bailey and Barbara L. Bedford "TRANSIENT GEOMORPHIC CONTROL OF WATER TABLE AND HYDRAULIC HEAD REVERSALS IN A COASTAL FRESHWATER PEATLAND," Wetlands 23(4), 969-978, (1 December 2003). https://doi.org/10.1672/0277-5212(2003)023[0969:TGCOWT]2.0.CO;2
Received: 1 July 2002; Accepted: 1 August 2003; Published: 1 December 2003
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