The influence of winds and tides in the formation of circulation layers in a bay, a case of study: Concepcion bay, Chile

Sobarzo, Marcus; Figueroa, Dante; Arcos, Dagoberto

Keywords: chile, concepcion bay, Circulation layers

Abstract

Horizontal water velocities were measured using three current meters moored at the levels of 5, 18, and 30 m depth in the oriental side of Concepcion Bay (3640’S; 7302’W), an almost rectangular, shallow bay off central Chile, connected with the open sea through two mouths. The large momentum transfer from the wind to the water causes variations of the internal volume of the bay generating circulation layers having almost anti-parallel directions. Northerly winds carry superficial water into the bay, causing a compensating flow leaving the bay near its bottom. Winds from the SW, on the other hand, cause an outgoing circulation layer in the surface and a circulation layer entering into the bay near the bottom. During wind calm periods, longer than 12 h, the two layers disappear, leaving a current system comprising only one circulation layer. The response time necessary for the generation or dissipation of these layers, which fluctuates between 1 and 7 h, depends on the initial conditions of the bay and on the intensity, direction and persistence of the wind.

Más información

Título de la Revista: ESTUARINE COASTAL AND SHELF SCIENCE
Volumen: 45
Editorial: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Fecha de publicación: 1997
Página de inicio: 729
Página final: 736
Idioma: English