Blankensee (lake near Trebbin)
|Geographical location||Germany , Brandenburg|
|Places on the shore||Blankensee|
|Location close to the shore||Trebbin|
|Altitude above sea level|
|Maximum depth||2.00 m|
|Middle deep||1.38 m|
The lake is under nature protection
- Northwest side about 2.74 km
- East side about 1.56 km and
- South side about 2.19 km.
Despite its considerable size of 280 hectares , the Blankensee is very shallow with an average water depth of 1.38 m and a maximum water depth of 2.0 m. At the time of the early Atlantic around 7000 years ago, the Blankensee was still 12 to 18 m deep. As drill core investigations from 2004 show, the lake was of course eutrophic even at that time . In the subsequent period silted lake unusually fast and since the period around 3000 BC already polytrophic , at times even more than today. Planktogenic sediments from diatom flora formed on the lake bed . In the 13th century the lake was only 2 m deep. Since the water in shallow lakes can no longer be stratified according to temperature differences and is therefore regularly mixed by the wind, such waters are considered polymictic lakes. Due to the Nieplitz flow through the lake, on the one hand substances such as nitrogen and above all phosphorus are carried into the lake, on the other hand the river mixes the water and exchanges it. The Blankensee is now considered hypertrophic with an unusually high total biomass volume of around 62 cm³ / m³ water. Because of the excess supply of nutrients and the rapid warming caused by the shallow water depth when exposed to sunlight, there is an increase in algae masses in summer, the water bloom . In the summer algae species of the Blankensee, blue-green algae predominate with 89% .
The lake is surrounded by an intact belt of reeds , several hundred meters wide in places , and represents a valuable biotope . The silting, marshy banks are inaccessible. A boardwalk runs along the north-eastern shore of the Blankensee, which allows you to visit the lake. The lake is a nature reserve , swimming and fishing are therefore prohibited.
Not far from the southwest corner of the Blankensee is the small Zauchwitz district of Körzin . Here the Nieplitz and the Pfefferfliess flow into the lake. Not far from the north-western bank, the district boundary runs between the districts of Teltow-Fläming and Potsdam-Mittelmark . The district of Breite , which belongs to Stücken , is about 360 m from the north-west bank. Blankensee, named after the lake, is located with its center on the left bank of the Nieplitz not far from the northern tip of the lake. Here the Nieplitz leaves the lake and strives for the Grössinsee, 1.3 km away . The east bank, which is almost completely covered with trees, is slightly higher and sloped through the western foothills of the Glauer Berge . Not far from the east bank, the road runs from Jütchendorf to Schönhagen , which is around 1.4 km from the south-eastern corner of the lake. Finally, the south bank is also slightly elevated, here are the Mühlenberg and Lankenberg mountains. South of this hill the federal highway 246 leads from Schönhagen to Stangenhagen .
Since the reopening of the centuries-filled Vohskutengraben on the Riebener See in 2004, there has again been a permeable connection for fish and other water hikers between the Blankensee and the Riebener See via the Pfeffergraben and the Pfefferfließ.
- Paleolimnian model construction and biocene-based assessment approaches for river lakes using the example of diatoms (= specialist articles by the State Environment Agency . Issue No. 93, 2005. PDF file, 2 MB).