Abstract
While there is an abundant literature on the sediments of Swedish, German and North American lakes, the bottom deposits of Danish lakes are nearly terra incognita. In spite of the paper on Lake Marl, Lake Ores and Lake Gytje published in 1901 by Wesenberg Lund a more systematic investigation has long been needed. In 1942 I therefore began an investigation of the sediments in Lake Tystrup Sø, Zealand (Sjælland), in co-operation with the Laboratory for Fresh Water Biology of the University of Copenhagen, and using the laboratory's annex in Suserup woods as a base. It is my aim to continue such investigations in other Danish lakes. It is my pleasant duty to thank the Director of the Laboratory for Fresh Water Biology, Prof. Kai Berg for that friendship which he has shown me during the investigation, both in the laboratory in Hillerød, and in Suserup. I also thank the Geological Survey of Denmark because it has agreed to include this paper in its publications, and lastly I thank the Carlsberg Fond who have subsidized the publication.
Highlights
The connection between lake Tystrup S0 and lake Bavelse S0 is through the 150 m long and 60 m wide channel between the northern shore of the lakes and the isthmus Rejnstrup Holme
In connection with the bottom investigations the author h as made several sounding traverses, a reading being taken for every twenty five oar strokes on a traverse between two points on the shores
This method is not very accurate, for when the wind is blowing strongly it is difficult to hold course, and as the soundings were taken in the years 1945- 1947, some in the spring, some in the summer and others in the autumn, one cannot be sure that the water level in the lakes was exactly the same at a ll times
Summary
The connection between lake Tystrup S0 and lake Bavelse S0 is through the 150 m long and 60 m wide channel between the northern shore of the lakes and the isthmus Rejnstrup Holme. In connection with the bottom investigations the author h as made several sounding traverses, a reading being taken for every twenty five oar strokes on a traverse between two points on the shores This method is not very accurate, for when the wind is blowing strongly it is difficult to hold course, and as the soundings were taken in the years 1945- 1947, some in the spring, some in the summer and others in the autumn, one cannot be sure that the water level in the lakes was exactly the same at a ll times.
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