Water exchange between the deep basins of the Baltic Sea during stagnation periods ventilates the bottom layer. Such exchange may be local and associated with the seabed topography features. The aim of this study is to investigate the possible pathway of water exchange within the Gdańsk-Gotland Sill. A comprehensive study was conducted near the one of the local erosional trenches (depressions), comprising bathymetric survey using multibeam echosounder, water column CTD-sounding, tilt current meters mooring, and sampling of seabed deposits and macrozoobenthos. The absence of pelitic sediments even in the natural trench depressions was identified. The seabed is composed of dense clays with surface erosion signs. The presence of a current towards the Gotland Basin was recorded in the bottom layer of the erosional trench. This layer was characterized by increased salinity and dissolved oxygen concentration. The trench was also an area with macrozoobenthos richer in species composition and biomass. Moreover, indicator species of the North Sea waters were found exclusively within the erosional trench. Macrozoobenthic community structure and the age of benthic organisms confirm the existence of permanent water exchange directly from the Słupsk Furrow through the erosional trench, and indicate one of the advective pathways of water exchange between the deep Baltic Sea basins.

在停滞期间，波罗的海深水盆地之间的水交换使底层通风。这种交换可能是局部的，并且与海床的地形特征有关。这项研究的目的是研究格但斯克-哥德兰基尔内水交换的可能途径。在其中一个局部侵蚀沟（洼地）附近进行了一项综合研究，包括使用多束回波测深仪进行水深测量，水柱CTD测深，倾斜式电流计系泊以及对海底沉积物和大型动物的采样。甚至在自然的沟洼中也没有骨灰质沉积物。海床由具有表面侵蚀迹象的致密粘土组成。在侵蚀沟渠的底层记录了流向哥特兰盆地的水流。该层的特征在于盐度和溶解氧浓度的增加。该沟也是一个大型动物的区域，那里的物种组成和生物量都比较丰富。此外，仅在侵蚀沟内发现了北海水域的指示物种。大型动物学的底栖生物群落结构和底栖生物的年龄证实了直接存在于斯洛普斯克沟通过侵蚀沟的永久性水交换的存在，并表明了波罗的海深海盆地之间水交换的对流途径之一。