Author(s)

J. Laanearu

Abstract

On coastal waves and related upwellings in the Narva bay J. Laanearu Department of Mechanics, Tallinn Technical University, Estonia Abstract Large vertical displacements of the coastal waters in the Narva Bay (the Baltic Sea), observed during 2001-2002, were found dependent on the winds and topography. The Ekman drift of surface water associated with the eastern wind led to the longshore mixing in the southwestern side of the bay, but vertical motion in the vicinity of the Narva River mouth was suppressed. The quasi-geostrophic shallow water equations for the reduced gravity case are used to investigate the long-wave characteristics for internal motion. In the half-triangular cross section, wide in terms of the baroclinic Rossby deformation radius which is based on the potential depth, the internal wave trapped to the vertical sidewall moves with the corrected Kelvin-wave speed, and the wave speed at the other side of the section is based on the coastal slope. Simple mechanisms of the thermocl

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