Estuaries. Tidal Potomac Teacher Training Workshop June 2008 (with thanks to Leila Hamdan). Outline. What is an estuary Key Features of Estuaries in general Examining our famous Estuary: Chesapeake Bay Nutrients and Pollutants Habitat Human Interaction. What is an Estuary?.
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Tidal Potomac Teacher Training Workshop
(with thanks to Leila Hamdan)
“ An estuary is a semi-enclosed coastal body of water having a free connection with the open sea and within which the sea-water is measurably diluted with fresh water deriving from land drainage”
Pritchard’s treatment of estuaries based upon the common physical characteristics shared by this type of ecosystem
Cameron, W.M. and D.W. Pritchard. 1963. Estuaries. InThe Sea: Ideas and Observations on Progress in the Study of the Seas. Volume 2. M.N. Hill (ed) 1963. Interscience Publishers, New York.
Pritchard, D.W. 1967. What is an Estuary: Physical viewpoint. In Estuaries. Publication # 83. AAAS, Washington, D.C.
High fresh water
Runoff from snow melt into tidal rivers pushes higher salinity
water down Bay
Schubel, J.R. and D.W. Pritchard. 1987
Fresh water run-off lessens during summer and autumn.
Higher salinity waters surge in from the Bay mouth and into upper reaches of the Bay and its sub-estuaries (rivers).
Schubel, J.R. and D.W. Pritchard. 1987.
From: Schubel, J.R. and D.W. Pritchard. 1987
Sediment delivery to CB increased during urbanization of watershed (ca 1950s) and continues today
Shading due to sediment was key factor to early decline in SAV
Impervious surfaces (highways) increase sediment delivery