Dr Armin Peter & Eva Schager: Die Durchwanderbarkeit

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Dr Armin Peter & Eva Schager: Die Durchwanderbarkeit Die Durchwanderbarkeit im Rhein Beispiele aus der Schweiz: Rheinzuflüsse Armin Peter & Eva Schager Eawag: Das Wasserforschungs-Institut des ETH-Bereichs, CH-6047 Kastanienbaum Internationaler Workshop „Durchwanderbarkeit Rhein“, Freiburg i. Br. 23.6.2007 23.6.2007 1 Überblick • Verbreitung des Lachses in der Schweiz • Bedeutende Zuflüsse: Wiese, Birs, Ergolz, Töss, Thur • Aktueller Status dieser Flüsse • Durchgeführte Massnahmen • Probleme: Temperatur • Zusammenfassung 23.6.2007 2 Staustufen im Hochrhein Schaffhausen Albruck-Dogern Rheinau Laufenburg Eglisau Säckingen Reckingen Bodensee Ryburg_Schwörstadt Rheinfelden Augst-Wylen Thur Birsfelden Töss Aare Glatt Ergolz Wiese, Birs 23.6.2007 3 Glatt Lachs Limmat Birs (Salmo salar) Thur Aare Töss Emme Reuss Saane Verbreitungsgebiet 19. Jahrhundert 23.6.2007 4 (Dönni & Freyhof 2002) Weitere früher bedeutende Fisch- und Rundmaularten mit Langdistanzwanderungen • Aal • Stör • Meerforelle • Maifisch • Flussneunauge • Meerneunauge 23.6.2007 5 Wiese • degradierter Zustand • Durchwanderungsprobleme • montone Habitate Revitalisierungsmassnahmen 1998-2000 • Verbesserung der Ökomorphologie (Breiten- und Tiefenverhältnisse) • Verbesserung des Austausches Ober- flächenwasser - Grundwasser 23.6.2007 6 Wiese vorher nachher Quelle: www.statistik-bs.ch/kennzahlen/ iak/g_umwelt/e_ul4 23.6.2007 7 Wiese Geeignet bedingt geeignet nicht geeignet aus Becker & Rey 2005 23.6.2007 8 Wiese Kosten Revitalisierungsprojekt 1998-2000 Fr. 976‘000.– für eine Strecke von 640m Entspricht Fr. 1‘525.– pro Laufmeter (zirka Euro 955) 23.6.2007 9 Birs Durchgeführte Massnahmen: • Durchwanderbarkeit (z. B. Mündung) • Revitalisierungen (z. B. BirsVital:1.5 km, St. Jakobsstrasse, Strecke Münchenstein-Arlesheim • Entlastung von gereinigtem Abwasser 23.6.2007 10 Birs aus Becker & Rey 2005 23.6.2007 11 Birs Verbesserung der Durchgängigkeit im Mündungsbereich vorher nachher Fotos aus Becker & Rey 2005 23.6.2007 12 Birs Massnahme Revitalisierung Birs vor Revitalisierung http://www.wald-basel.ch/docs/bud/mitbud/2004/ 23.6.2007 13 Birs Projekt BirsVital, 1.5 km Birs nach Revitalisierung http://www.wald-basel.ch/docs/bud/mitbud/2004/ 23.6.2007 14 Revitalisierung Münchenstein – Arlesheim Birs 2004-2005 23.6.2007 15 Kosten Birs • Entfernung Birskopfschwelle (Jahr 2000): Fr. 1.4 Mio Fr. (0.88 Mio Euro) • Renaturierungsarbeiten und Durchgängig- keit im Jahr 2001 (St. Jakobstr.-Häfeliwehr) Fr. 250‘000.– (Euro 158‘000) • Projekt Birs Vital: Ableitungskanal Fr. 10.2 Mio (6.4 Mio Euro) Revitalisierung Fr. 7.1 Mio für 1.5 km = Fr. 4733 pro Laufmeter (2981 Euro) • Münchenstein-ARA Reinach, Uferverbesserungen zirka 1‘100 m total Fr. 165‘000 oder Fr 150.– pro Laufmeter (Euro 95) 23.6.2007 16 Ergolz • Untergeordnete Bedeutung als Lachsgewässer • Erste natürliche Barriere nach knapp 3 km • Lokale Massnahmen zur Verbesserung der Durchgängigkeit im Oberlauf • Strukturelle Aufwertungen von ca. 1400 m (Oberlauf) Quelle: Becker & Rey 2005 23.6.2007 17 Töss und Thur Schaffhausen Albruck-Dogern Rheinau Laufenburg Eglisau Säckingen Reckingen Bodensee Ryburg_Schwörstadt Rheinfelden Augst-Wylen Thur Birsfelden Töss Aare Glatt Ergolz Wiese, Birs 23.6.2007 18 Thur durchgängig auf ~41 km 5 Stauwehre / 66 km 12 km bis 1. natürliches Hindernis (2.5m) Töss durchgängig auf 4.2 km 11 Stauwehre / 57 km 162 künstliche Abstürze 17 natürliche Abstürze ~3 Abstürze/km 23.6.2007 19 Quelle: Bafu 2006 Thur 23.6.2007 20 http://www.baudirektion.zh.ch/internet/bd/de/medienforum/Medienmitteilungen/ Thur 23.6.2007 21 http://www.baudirektion.zh.ch/internet/bd/de/medienforum/Medienmitteilungen Thur Projektkosten: zirka 52 Mio Fr. (Euro 33 Mio) 23.6.2007 22 http://www.baudirektion.zh.ch/internet/bd/de/medienforum/Medienmitteilungen 23.6.2007 23 Fotos: Chr. Herrmann, BHATeam AG, Frauenfeld Thur Foto Thur: Chr. Herrmann, BHATeam AG, 23.6.2007 24 Frauenfeld Thur 23.6.2007 25 Thur Massnahme Flussaufweitung • Länge 1.5 km • Gerinneverbreiterung Faktor > 2.5 • Kosten: Fr. 9.9 Mio (Euro 6.2 Mio) • (Fr. 6‘600 pro Laufmeter (Euro 4‘150) 23.6.2007 26 Problem Gewässertemperatur Erwärmung der Fliessgewässer in den letzten 25 Jahren (Folge des Klimawandels): 0.4 – 1.6 °C Kritisches Temperaturmaximum für 0+-Lachs liegt zirka bei 29 °C (Grande & Andersen 1991) 23.6.2007 27 Wassertemperatur Sommermaximum °C 2003 2004 Birs / Münchenstein 24.4 21.6 Thur / Andelfingen 27.2 24.7 Töss / Freienstein 25 21.7 Quellen: BWG, Kanton ZH 23.6.2007 28 Zusammenfassung • Durchwanderbarkeit und Morphologie kontinuierlich verbessert • allerdings noch viele Defizite vorhanden (Habitate, Staustufen in Hochrhein & Aare) • hohes Investitionsvolumen • Thur und Töss bleiben schwierig zu erreichen, aber für dort vorkommende Fischarten deutliche Verbesserungen • Problembereich: Temperatur 23.6.2007 29.
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