Reconstruction of the primary bottom of a unique crater lake in the “Meteoryt Morasko Reserve” (Poland)

Abstract

There are a total of several million lakes in the world, which includes only approximately 30 crater lakes. Due to this extreme global rarity, they are the subject of research in many scientific disciplines. In spite of the widespread interest in them, however, many issues still require detailed investigation. In the case of the Morasko crater lake (Poland), hydrological research has been weakly developed so far. The undertaken analysis, which employed a complex research procedure involving the use of georadar, geological corings and bathymetric measurements, aimed to determine the primary bottom of the lake, and further to determine the scale and rate of its evolution. The modern water level suggests that the lake basin is currently approximately 55% filled in with organic matter, and the rate of its sedimentation in the deepest place can be estimated at approximately 0.8 mm·y−1.

Classification and Quantification of Urban Geodiversity and Its Intersection with Cultural Heritage

“…The valley, deeply cut into the terminal morainic hills of the Poznań Phase and occupied by a multichannel, meandering or anastomosing river (Zwoliński et al 2017 ), became a favourable area for medieval settlement. Other prominent geological features present within the city’s administrative boundaries include endorheic basins of meteoritic origin and crater lakes that are unique in Poland and rare on a global scale (Choiński et al 2019 ).…”