No abstract

A digital bathymetric model with a spatial resolution of 10 × 10 m have been created based on measurements of bottom depths on the Southwest slope of the Island Valaam (Lake Ladoga) by sidescan sonar combined with geo-referenced system. Bottom inclinations were recognized with magnitudes up to 60° with rock structures with virtually no modern sediments. Scree and large boulders have been found, which can cause underwater noise when sliding down the steep slopes of Island Valaam.