Paper No. 25-15
Presentation Time: 8:00 AM-6:00 PM
SUBMARINE GROUNDWATER DISCHARGE BENEATH EASTERN CASCO BAY, MID-COAST, MAINE
LIM, Megan Elizabeth, Geology, Bowdoin College, 502 Smith Union, Brunswick, ME 04011, mlim@bowdoin.edu and LAINE, Edward P., Geology, Bowdoin College, Druckenmiller Hall, Room 120C, Brunswick, ME 04011

Hydrographic studies in several locations within eastern Casco Bay suggest that ground water is discharging through the seabed, creating layers of anomalously fresh water in the bottom most meter of the water column. Deep-water areas of Quahog Bay continuously revealed bottom water up to 5 psu fresher when compared to overlying waters. Locations in Quahog Bay and Harpswell Sound were monitored with multiple CTD lowerings on several time scales during a three-month period in the summer of 2002. Moreover, salinity anomalies were both geographically and temporally persistent. Similar intensive hydrographic studies in nearby Harpswell Sound showed little evidence for widespread submarine groundwater discharge. Our working hypothesis is that submarine groundwater discharge originates from fractured bedrock aquifers beneath Quahog Bay. Quahog Bay is underlain by the gneisses of the Late Ordovician to Early Silurian East Harpswell Group. Harpswell Sound is underlain by the schists of the Middle Ordovician Spring Point and Cape Elizabeth Formations.

Northeastern Section - 38th Annual Meeting (March 27-29, 2003)
General Information for this Meeting
Session No. 25--Booth# 43
Undergraduate Research in the Geological Sciences I (Posters)
Westin Hotel: Commonwealth A
8:00 AM-6:00 PM, Friday, March 28, 2003
 

© Copyright 2003 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.