Distribution and Morphology of Fluidogenic Landforms in the Shallow Part of the Pechora Sea

The results of multibeam echo sounding and high-frequency seismic profiling in the Pechora Sea in 2020–2023 have established regularities in the distribution of fluidogenic landforms on the bottom associated with the background topography, which was formed in the Late Pleistocene under the influence of subaerial processes. In areas where submarine permafrost is massive or of high areal coverage, seabed fluid flow is usually diffuse and fluidogenic landforms are not expressed or are extremely weakly expressed. The highest density of fluidogenic landforms is observed in depressions where permafrost has fragmentary structure or low areal coverage. Fluidogenic landforms are not widespread in shallow water areas (less than 35 m), as permafrost acts here as a powerful fluid barrier. In the process of gradual flooding of the territory at the end of the Late Pleistocene and the beginning of the Holocene, the development of fluidogenic landforms took place with the participation of currents (in the early stages, including wave and tidal currents). Areals of fluidogenic landforms on the bottom lead to the appearance of lateral differentiation of current velocities, appearance of local erosion and accumulation zones, appearance of specific microrelief (depressions, scarps, channel drifts).