On the spatiotemporal structure and mechanisms of the Neva River flood formation |
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| Authors: | E A Zakharchuk N A Tikhonova |
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| Institution: | (1) Baltic Nest Institute, Stockholm University, 10691 Stockholm, Sweden;(2) Russian State Hydrometeorological University, Malookhtinsky pr., 98, 195196 Saint-Petersburg, Russian Federation;(3) Arctic and Antarctic Research Institute, Bering str. 38, 199397 Saint-Petersburg, Russian Federation |
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| Abstract: | A comparative contribution of the sea level oscillations of various time scales (long-term, seasonal, synoptic, and mesoscale)
to the formation of the Neva River floods is estimated. The identification of the Neva River flood waves as the long gravity
ones existing nowadays is called in question. The comparison of estimated characteristics of flood waves with the theoretical
variance relations of different types of long waves is carried out. This comparison as well as the results of analysis of
meteorological information and numerical experiments carried out before on the basis of the hydrodynamic model of the Baltic
Sea demonstrate that the Neva River flood waves are identified as the forced baroclinic topographic waves generated as a result
of the resonance between the anemobaric forces in atmospheric cyclones and low-frequency eigenmodes of the open Baltic Sea-Gulf
of Finland system. |
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