User:DorisH68/Aasee (Münster)

Lake Aasee is an artificial lake in Münster, Westphalia.

Contents

• 1 Geography
• 2 History
• 3 Life around lake Aasee
• 4 Water bus
• 5 Water quality
• 7 Bibliography

Geography

The lake lies southwest of the city center. It has an area of 0,402 km² (0.155mi²) and is approximately 2.3 km (1.4 mi) long. It is 2 meters (79 inches) at its deepest point. The lake is surrounded by numerous green spaces and trees, which makes it the largest recreational area in the city of Münster.

The lake blocks the water of Münster´s Aa River and protects the city from flooding. It also provides cool air for the city, because mainly southwest air masses are cooled above the lake. Therefore, it has an important ecological and urban planning function for the city. This also applies to the increasingly natural environment around the lake, which offers breeding grounds and habitat areas for many species and as a result makes it a popular recreation area for the citizens of Münster. The water level fluctuates by up to a meter (39 inches).

History

During the siege of Munster by Prince Bishop Christoph Bernhard von Galen on December 18, 1660, two earth walls collapsed, cutting off the city's water supply, causing large parts of the city to be flooded. Münster then surrendered to the besiegers.Even years later, the floodwaters from the collapse of the dam could still be seen at the site of today's Lake Aasee.

Until the beginning of the 19th century there were still wetlands and swampy meadows,caused by the 1660 flood, where the Aa River was running through. These meadows were regularly flooded, sometimes the water level rose high enough to flood the historic downtown of Münster. As early as 1888, Hermann Landois, a professor of zoology in Münster, advocated for the construction of an “Aa basin” to better control the level of the Aa River. At the same time, Landois wanted to guarantee the city's drinking water supply with the reservoir, enable sports activities such as rowing, sailing and swimming. The lake should contribute to the city's beautification, and also reduce the source of pathogens by flushing the Aa bed, since the Aa also acts as a sewage canal for the city. In spring 1914, a quarter of a century after Landois´ explanations and nine years after his death, Italian workers started to implement his visions to reduce the risk of flooding for the city of Münster.

However, the excavation for the artificial lake had already been interrupted that year by World War I. The construction, under mayor Georg Sperlich, was only resumed after a serious flooding in 1925. The lake was finally completed in 1934 with a water surface of 20.7 hectares (51 acres). Under the Nazis there were plans to build an amphitheatre in the surrounding meadows. These plans were discarded after the end of the war and, instead, in 1972 to 1976 the lake south of the Torminbridge was expanded by 19,5 hectars (48 acres) to almost double the size, as part of the construction work for the Münster Allwetterzoo . In 1976, the park areas were enlarged by 50 hectares to a total of 90 hectares, with about 10 kilometers of trails that run through it and around 18 hectares (44.5 acres) of lawn for recreation.

Later, shallow water zones were created on the banks of the new part of the Aasee. They were intended to reduce the nutrition load of the inflowing water. In 1996 the riverside landscape was redesigned as far as Haus Kump. In 2008 the Aaseeterrassen were opened. These steps for visitors to sit on are on the most northern point of the water near to the city. The lake "Aasee" area is home to three restaurants, a boat rental, a boating school and three sailing clubs: Segel-Club Münster, Segelclub Hansa Münster and Westfälisch-Holsteinische Seglervereinigung mit Hochschulsegelclub Münster (WHS/HSC).

Aaseeterrassen

In 2009, the Aasee Park was named "Most Beautiful Park in Europe" after being voted "Germany's Most Beautiful Park" in 2008.

In the first half of 2012, the "Badestraße fish ladder" was built. The intention was to enable the continuity of the Aasee weir for aquatic organisms in accordance with the requirements of the Water Framework Directive. Due to limited space available in the inner city, the so-called "slotted pass construction" was chosen for this fish ladder. (→water quality)

Life around the lake Aasee

2004-09-07-Aasee Münster

Today the lake is the centerpiece of a popular recreation destination near the city center. A youth hostel, several student residences, the student canteen at the Aasee, the "Sentruperhöhe" sports park, the Allwetterzoo Münster with the Westphalian Horse Museum Münster, the LWL (Regional Association of Westphalia-Lippe) Museum for Natural History with a planetarium and the "Mühlenhof" open-air museum Münster are located at the Aasee. There are two small sailing boat harbors with with a variety of places to eat. A hiking and jogging trail of about 5.7 km (3,5 miles) length leads around the lake.

A rowing regatta is held every spring. Around 900 rowers in 470 boats took part in the 42nd spring regatta on April 20th and 21st, 2013.Juniors from the age of 17 participated as well as the adult participants over the Olympic distance of 2000 meters, which stretches over the entire length of Lake Aasee. Younger athletes could compete over a distance of 1500 meters, while the older ones go in for 1000 meters.

Since 2009, Lake Aasee has been one of the venues for the German Rowing League. In September 2012, the German Sprint Championships were held in Münster. From October 11th to 18th, 2013 the 100th German championship of the rowing eight on the long distance took place.

Rowing regatta in April 2010

On April 12th and 13th, 2013, for the third time a ranking regatta of the Paralympic one-man keelboat class 2.4mR was held on Lake Aasee.

The oldest hot-air balloon event in Germany, has been held on the Aasee meadows since 1969. The Montgolfiade is organized every August by the „Freiballonsport-Verein Münster und Münsterland e. V.“ in cooperation with the sports department of the city of Münster. This local recreation area serves as a sailing venue for two sailing clubs. In autumn, the Pirates' Aasee Cup, organized by the Münster Sailing Club, takes place on the part of the lake nearest to the city. On the upper Aasee, the part of the lake farther away from the city center, the pirate regatta "Bockwurst Challenge", the "Laser Cup" for all laser classes and the optimist "Kiepenkerlregatta" are held every year as ranking list regattas by the "Hansa Münster" sailing club.

The local recreation area serves as a sailing area for two sailing clubs

Especially on May 1st (Mayday holiday) the Aasee draws crowds of guests who visit the local recreation area for a barbecue. After May 1, 2013, employees of the waste management company of Münster collected six tons of trash from the park area around Lake Aasee. The underground bins for waste and hot barbecue ashes, installed the year before, have been well received.

The stairs of the Aasee terraces offer space for 2,000 spectators at events to sit on. Episodes of the Wilsberg crime series, set in Münster, are regularly shown there. Classical concerts with international cast known as "AaSeerenaden" have also been performed on the Aasee Terraces since 2010 and end always with a fireworks display. A musical program ranging from “jazz to classical, orchestra to choir, pop to baroque” is regularly performed. Intendant (artistic director) is Peter von Wienhardt. According to the organizers, more than 20,000 visitors take part in the three-day event and its supporting program.

Water bus

The "Waterbus Professor Landois", which was named after Hermann Landois, the founder of the zoo in Münster, was built from mahagony on oak in a shipyard on Dümmersee (lake Dümmer) in 1974 based on the model of a Dutch canal boat with a length of 17 meters and a width of 4.50 meters. After 36 years of service and it´s last trip, the water bus was transferred to a shipyard in Stralsund on November 6, 2011. The successor was also built there.

„Solaaris“ on lake Aasee

The successor "Solaaris" is a solar catamaran made entirely of aluminum and powered by two electric motors. At full load, the electric motors have a volume of 55 decibels and accelerate the craft to 9.8 km/h (about 6.1 m/h). The usual service speed is 7 km/h (4.3 m/h). The Solaaris has no alternative drive to its electric motor. Solaaris is almost 16 meters long, has disability access and can accommodate 68 passengers. It´s cost is approximately 500,000 Euros. The battery system alone comes to around 200,000 euros. Münster´s department of public works subsidized Solaaris with a contribution in the amount of 55.000 Euros in 2012. The Solaaris was built in the Ostseestaal shipyard in Stralsund within 70 days. On March 23, 2012, she had her maiden voyage on the Baltic Sea. A day later it arrived on a flatbed truck in Münster at the Aasee. Lord Mayor Markus Lewe then christened the ship on April 2, 2012, at Lake Aasee. He casted off on the maiden voyage on Lake Aasee and scraped a sailing dinghy. Solaaris started its regular service on the Aasee on Good Friday, April 6th, 2012. In the 27 weeks of service in 2012, the Solaaris,carrying 20,000 to 20,500 passengers, made 1,045 trips using solar energy. Since Solaaris is almost five meters wider than its predecessor Professor Landois, around 40 meters of sheet piling had to be removed in the Allwetterzoo Münster so that the boat could reach the zoo's harbor. Accordingly divers were deployed by a Duisburg company who welded under water.

From June 12th to June 14th, 2013 plays including Shakespeare's The Tempest were performed aboard the Solaaris.

Water quality

Swimming and surfing in Lake Aasee are currently not recommended and even prohibited due to the poor water quality, especially in the hot summer months. However, there are efforts to improve the water quality. The main problems are the blue-green algae, which are multiplying in large numbers due to over-fertilization, but also E. coli bacteria. Skin contact with the Aasee water can lead to irritation in summer, and swallowing it can lead to life-threatening illnesses. The Hygiene Institute of the Westfälische Wilhelms-Universität Münster has meanwhile reduced the number of blue-green algae in particular with the help of appropriate chemicals to remove nutrients from the lake. Good results have already been achieved after two years of use.

However, the main sources of eutrophication in the lake have not been eliminated. In many places, the Münstersche Aa is still surrounded by a lot of farmlands and the fields drain into the river. Pollutants like nutrients, streets and sewage treatment plants should also not be neglected. The trophic level of a still body of water as in the Aasee cannot be kept permanently low. Without extreme structural interventions such as deep-water drainage or heavy dredging, it will not be possible to permanently eliminate the sapropel that has been created as a negative side effect of the long period of anaerobic conditions.

It should also be noted that the trophic level of a still body of water like the Aasee cannot be kept permanently low. Without extreme structural interventions such as the deep-water drainage method or heavy dredging, it will not be possible to permanently eliminate the sapropel that has been created as a negative factor by the long period of anaerobic conditions.

In 2012, a fish ladder was completed at the cost of 350,000 Euros. The water quality of Lake Aasee will be improved by the exchange of microbes, which has not been possible for 90 years due to the weir on the street Badestraße. The fish-ladder allows organisms such as fish and microbes to migrate again. Likewise, the stocks of non-predatory fish in Lake Aasee, such as bream, should mix with the predatory fish, including pike and zander, from the Münstersche Aa in order to stabilize the ecosystem. The construction of the fish ladder was planned in 2010 but was postponed due to a lack of funds. Construction work began in July 2011 and lasted until autumn 2011.

Furthermore, by ecological measures like renaturing the course of the Münstersche Aa south of the Aasee via Haus Kump to Sentruper Straße the water quality of the Aasee is to be improved. The Aa River is now a curvaceous, natural and, above all, the flood defying body of water again². A sand filter was created at the height of Haus Kump, which is intended to prevent further silting up of the Aasee. In addition, the creation of a body of standing water is intended to lower the temperature of the inflow into the Aasee by a few degrees to reduce the growth of blue-green algae.

Bibliography

1. Der Aasee – Freizeit, Erholung, Ökologie und Wasserqualität. In: stadt-muenster.de. Amt für Grünflächen, Umwelt und Nachhaltigkeit, abgerufen am 20. August 2019.
2. ↑ ^{Hochspringen nach:a b c} Martin Kalitschke: „350 Jahre Aasee“: Nicht nur Schwäne – Ausstellung im Stadtmusem. In: Westfälische Nachrichten. 29. Oktober 2010, abgerufen am 21. August 2019.
3. ↑ Historie des Aasees. In: www.aaseepark.de. pars pro toto GmbH, abgerufen am 20. August 2019.
4. ↑ Segeln in der Stadt. In: whs-muenster.de. WHS/HSC Münster, abgerufen am 24. September 2019.
5. ↑ Parchi più belli. Briggs & Stratton, abgerufen am 24. September 2019 (italienisch).
6. ↑ Der Aaseepark in Münster ist Deutschlands schönster Park 2008. Pressemitteilung. Stadt Münster, Presse- und Informationsamt, 25. August 2008, abgerufen am 24. September 2019.
7. ↑ Fischaufstiegsanlage am Wehr Badestraße. In: Gewässer in Münster. Amt für Grünflächen, Umwelt und Nachhaltigkeit der Stadt Münster, abgerufen am 24. September 2021.
8. ↑ ^{Hochspringen nach:a b c} 900 Ruderer vor der Bewährungsprobe: Frühjahrsregatta auf dem Aasee. In: Westfälische Nachrichten. 17. April 2013, abgerufen am 21. August 2019.
9. ↑ ^{Hochspringen nach:a b c} Westfälische Nachrichten: Der Aasee als Jubiläumsgeschenk: Rudern: Münster trägt im Oktober die 100. Deutschen Meisterschaften im Achter aus, Lokaler Sport, Ansgar Griebel, 28. Februar 2013
10. ↑ Westfälische Nachrichten: Ranglistenregatta auf dem Aasee, Lokaler Sport, Segeln, 12. April 2013
11. ↑ ^{Hochspringen nach:a b} Klaus Baumeister: Abfallwirtschaftsbetriebe und Stadt bleiben gelassen: Bilanz des 1. Mai: Sechs Tonnen Müll am Aasee. In: Westfälische Nachrichten. 2. Mai 2013, abgerufen am 24. September 2019.
12. ↑ GIG-online.de: Münster erleben von Aasee bis Zoo, in: UNI-GIG, SS 2013, Nr. 43, S. 6 ff.
13. ↑ „Aaseerenaden haben sich etabliert“: Peter von Wienhardt zur dritten Auflage des Crossover-Festivals / Planungen für 2013 laufen schon. In: Westfälische Nachrichten. 22. Juni 2012, abgerufen am 24. September 2019.
14. ↑ ^{Hochspringen nach:a b} Westfälische Nachrichten: Bühne frei für die vierte Auflage – „AaSerenaden“: Rückblick und Ausblick. In: Extra: AaSeerenaden. 2. Juli 2012, S. 3.
15. ↑ Besucher spendeten 38.000 Euro. In: Westfälische Nachrichten. 17. Juli 2017, abgerufen am 24. September 2019.
16. ↑ ^{Hochspringen nach:a b c d} Gabriele Hillmoth: Nachrichten Münster: Der Skipper vom „Landois“. In: Westfälische Nachrichten. 6. April 2008, abgerufen am 24. September 2019.
17. ↑ ^{Hochspringen nach:a b c} Jürgen Grimmelt: Letzte Fahrt auf dem Aasee: Ende einer Ära – Abschied von der „Prof. Landois“. In: Westfälische Nachrichten. 15. November 2011, abgerufen am 24. September 2019
18. ↑ Lukas Speckmann: Ein Wahrzeichen mustert ab: Die „Professor Landois“ geht nach 36 Jahren in den Ruhestand. In: Westfälische Nachrichten. 24. September 2019, abgerufen am 12. Oktober 2011.
19. ↑ ^{Hochspringen nach:a b c} Jürgen Grimmelt: Prof. Landois-Nachfolger: Solar-Traum aus Aluminium. In: Westfälische Nachrichten. 15. Dezember 2011, abgerufen am 24. September 2019.
20. ↑ Jürgen Grimmelt: Neues Aaseeschiff: Surfer auf der „Solaaris“ – Schülerinvasion auf der Solaaris. In: Westfälische Nachrichten. 29. März 2012, abgerufen am 24. September 2019.
21. ↑ ^{Hochspringen nach:a b} Jennifer Glahn: Mit dem Wasserbus über Wogen und Wellen: Aasee-Schiff Solaaris nimmt den regulären Dienst auf. In: Westfälische Nachrichten. 9. April 2012, abgerufen am 24. September 2019.
22. ↑ Uwe Wahlbrink: Defektes Ladegerät: „Solaaris“ ging der Saft aus. In: Westfälische Nachrichten. 9. Mai 2012, abgerufen am 24. September 2019.
23. ↑ ^{Hochspringen nach:a b c} . 14. Dezember 2011. Archiviert vom Original am 11. Februar 2013. Abgerufen am 5. April 2019.
24. ↑ Dirk Anger: Solarschiff schickt Landois in Rente. In: Westfälische Nachrichten. 8. Mai 2009, abgerufen am 24. September 2019.
25. ↑ ^{Hochspringen nach:a b} Münstersche Zeitung: Solaaris auf Erfolgskurs: Peter Overschmidt ist trotz Anlaufschwierigkeiten mit ersten Jahr auf See zufrieden, Nachrichten, Münster, Helmut Etzkorn, 5. November 2012
26. ↑ Dirk Anger: Diskussion in Münster über Sponsoring: 747.547 Euro aus dem Stadtwerke-Topf. In: Westfälische Nachrichten. 3. Mai 2013, abgerufen am 24. September 2019. Westfälische Nachrichten: Stadtwerke legen Sponsoring offen: Unternehmen geht Schritt in die Öffentlichkeit: Knapp 750.000 Euro wurden 2012 in Münster ausgegeben, Münsterischer Anzeiger, Münster, Dirk Anger, 3. Mai 2013
27. ↑ ^{Hochspringen nach:a b} Jürgen Grimmelt: Der neue Aasee-Wasserbus: Die „Solaaris“ nimmt Kurs auf Münster. In: Westfälische Nachrichten. 23. März 2012, abgerufen am 24. September 2019.
28. ↑ Münstersche Zeitung: Schiffstaufe: OB Lewe übernimmt das Steuer der Solaaris, Münster, Helmut Etzkorn, 2. April 2012
29. ↑ Münstersche Zeitung: Solaaris angekommen: Das neue Boot schwimmt auf dem Aasee, Münster, Helmut P. Etzkorn, 27. März 2012
30. ↑ Jürgen Grimmelt: Münsters neuer Aasee-Wasserbus: Schon fast ein richtiges Boot. In: Westfälische Nachrichten. 29. Februar 2012, abgerufen am 24. September 2019.
31. ↑ Ralf Repöhler: Solaaris sticht in See – neuer Wasserbus auf dem Aasee: Nixen stoppen Lewe nicht. In: Westfälische Nachrichten. 2. April 2012, abgerufen am 24. September 2019.
32. ↑ ^{Hochspringen nach:a b c} Taucher machen im Zoo-Kanal den Weg frei: Neuer Wasserbus „Solaaris“ ist zu breit. In: Westfälische Nachrichten. 16. März 2012, abgerufen am 24. September 2019.
33. ↑ Jürgen Grimmelt: Schrubben für den Saison-Auftakt: Wasserbus „Solaaris“ startet am Samstag in seine zweite Saison. In: Westfälische Nachrichten. 19. März 2013, abgerufen am 24. September 2019. Westfälische Nachrichten: Schrubben für den Saison-Auftakt: Wasserbus „Solaaris“ startet am Samstag in seine zweite Saison, Münster, Münster, Jürgen Grimmelt, 19. März 2013
34. ↑ Jennifer von Glahn: Solarschiff startete Fahrbetrieb auf dem Aasee: Leinen los für die Solaaris. In: Westfälische Nachrichten. 24. März 2013, abgerufen am 24. September 2019. Westfälische Nachrichten: Leinen los für die Solaaris: Solarschiff ist wieder auf dem Aasee unterwegs / Saison bis November
35. ↑ Münstersche Zeitung: Kultur-Sause auf der „Solaaris“: Philipp Schmidt schippert sein Publikum in der Reihe „Little Teaser“ unterhaltsam über den Aasee, Münster/Feuilleton, Münster, Edda Klepp, 15. Juli 2013
36. ↑ Münstersche Zeitung: Hunderttausende investiert: Fische an der Aa lernen das Treppen-Steigen, Münster, Helmut P. Etzkorn, 19. Juni 2012
37. ↑ ^{Hochspringen nach:a b c} Martin Kalitschke: Fischtreppe soll Wasserqualität steigern: Bauarbeiten starten im Juli. In: Westfälische Nachrichten. 2. Mai 2011, abgerufen am 24. September 2019.
38. ↑ Klaus Baumeister: CDU will Fischtreppe verschieben. In: Westfälische Nachrichten. 25. Januar 2010, abgerufen am 24. September 2019.
39. ↑ Jürgen Grimmelt: Wanderhilfe: Hecht und Zander können über Fischtreppe wieder in den Aasee schwimmen. In: Westfälische Nachrichten. 23. Mai 2012, abgerufen am 24. September 2019.
40. ↑ ^{Hochspringen nach:a b} Münstersche Zeitung: Teilstück wird renaturiert: Aa bekommt ihr natürliches Flussbett zurück, Münster, 10. Juli 2012
41. ↑ Thomas Schubert: Zurück ins alte Flussbett: Die Aa wird bis zum Herbst im Bereich zwischen Sentruper Straße und Haus Kump renaturiert. In: Westfälische Nachrichten. 16. Februar 2013, abgerufen am 24. September 2019.
42. ↑ Lukas Speckmann: Renaturierung: Die Aa wird schief gewickelt. In: Westfälische Nachrichten. 11. Juli 2012, abgerufen am 24. September 2019.