Based on measurements of waves and currents obtained for a period of 302 days with
a bottom-mounted RDCP (Recording Doppler Current Profiler) at two differently
exposed locations, a model for significant wave height was calibrated separately for
those locations; in addition, the Gulf of Riga-Vainameri 2D model was validated,
and the hydrodynamic conditions were studied. Using wind forcing data from the
Kihnu meteorological station, a set of current, water exchange and wave hindcasts
were obtained for the period 1966–2011. Current patterns in the Gulf and in the
straits were wind-dependent with characteristic wind switch directions. The Matsi
coast was prone to upwelling in persistent northerly wind conditions. During the hindcast period, currents increased along the Koiguste coast and in the Suur Strait,
waves decreased noticeably off Koiguste but fluctuated without a clear linear trend
near Matsi. The spatially contrasting results for differently exposed coasts were
related to the corresponding variations in local wind conditions and to changes in
atmospheric circulation patterns over northern Europe.
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