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Ecological Aspects of Dynamic Effects of Internal Waves’ Propagation in the Baltic Sea

This study is devoted to investigation of some aspects of the nonlinear dynamics of internal waves, in particular, the possibility of large-amplitude internal wave generation, in the context of their potential impact on the ecosystem of the coastal zone of the Baltic Sea and on the safety of the economic activities in this region. In this work we use the hydrology data from the Generalized Digital Environmental Model (GDEM) to show that in many regions of the Baltic Sea, due to the density stratification features, the modulation instability effect can be realized for packets of internal waves of moderate amplitudes. The critical frequency and distance at which the modulation instability develops for different regions are discussed. It is shown that model wave packet potentially can transform to the intensive internal waves. The potential impact of the fluxes induced by such waves on sediment transport is briefly discussed.