La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Observations and simulations of water-sediment heat exchange in a shallow coastal lagoon
Auteurs :	N. P. Smith, Auteur
Type de document :	Article
Dans :	Estuaries (25(3) JUN 2002)
Article en page(s) :	483-487
Résumé :	Water and sediment temperatures from Florida's Indian River Lagoon are used to investigate water-sediment heat energy exchanges and the resulting sub-bottom temperature fluctuations in a shallow-water estuarine environment. A 132-day study documents the response to cold-air outbreaks and spring warming. A one-dimensional, 120-layer numerical model simulates temperatures in the top 24 m of the sediment in response to observed water temperatures. Model simulations supplement sediment temperatures measured 50 and 95 cm below the water-sediment interface approximately weekly. Simulated water-sediment heat fluxes are generally between +0.075 (into the sediment) and -0.050 cal cm(-2) min(-1). The average simulated water-sediment heat flux is +0.003 cal cm(-2) min(-1). Over the course of an average day, heat entering the sediment reaches a maximum rate of 0.037 cal cm(-2) min(-1) at 1700, and fluxes out of the sediments reach -0.021 cal cm(-2) min(-1) at 0700. The standard deviations of sediment temperatures simulated for the 0-20, 80-100, and 180-200 cm layers are 85%, 41%, and 14%, respectively, of the standard deviation of the water temperature.

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