ISSN:
1745-6584
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Energy, Environment Protection, Nuclear Power Engineering
,
Geosciences
Notes:
The drainage basin of Barbadoes Pond, Madbury and Dover, southeastern New Hampshire, was studied by seismic refraction and magnetic measurements as part of an interdisciplinary investigation. The purpose of the geophysical measurements was to provide boundary conditions (bedrock and water–table elevations) for a mathematical model of ground–water flow. The basin is intensively used for recreation, municipal water supply, and sand and gravel mining.Barbadoes Pond is a kettle lake lying in the middle of a broad, flat–topped sand and gravel hill (a “kame plain”). The plain is surrounded by marine clay at a lower elevation.A broad, deep, northwest–southwest trending trough underlies the plain according to seismic refraction measurements (45 lines) and water wells. The present form and location of the trough are attributed to glacial enlargement of a stream valley eroded along a bedrock shear zone. The bedrock topography and seismic velocity are directly related to erosion resistance of the vertically dipping metasedimentary bedrock. Magnetic anomalies are consistent with the seismic results.Water–table elevation correlates with bedrock elevation, not surface elevation. This is a consequence of highly permeable sand and gravel, the principal surfical materials. Apparently the pond is not hydraulically independent of nearby wells and a large reservoir.The results invite speculation that kame plains occur over bedrock troughs. Such a relationship, if generally true, would speed search for good well sites in this region of rapid population growth and industrial development.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1745-6584.1976.tb03639.x
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