Circulation Changes in the Sheepscot River Estuary, Maine, Following Removal of a Causeway

Abstract
A causeway which had restricted tidal flow in a portion of the Sheepscot River estuary was removed late in 1974. Flowmeter data from moored plankton nets fished over full tidal cycles, and salinity observations made in conjunction with the net sets, were used to evaluate the effects of causeway removal on circulation in the estuary. Tidal flows in the main channel increased by almost 50%. This increase was accompanied by substantial decreases in salinity stratification and in the strength of the gravitational circulation.

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