Impulswellen: Effekte der Rutschdichte und der Wassertiefe
Language: German
Published by GRIN Verlag, 2010
- Softcover
- New
Seller: AHA-BUCH GmbH, Einbeck, GermanyAHA-BUCH GmbH
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Druck auf Anfrage Neuware - Printed after ordering - Doktorarbeit / Dissertation aus dem Jahr 2004 im Fachbereich Ingenieurwissenschaften - Bauingenieurwesen, Note: '-', Eidgenössische Technische Hochschule Zürich (Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie (VAW)), Sprache: Deutsch, Abstract: Impulswellen werden hauptsächlich in Alpenrandseen, Stauseen und steilufrigen Meeresbuchten durch eintauchende Fels- und Bergstürze, Erdrutsche, Uferinstabilitäten, Schneelawinen und Gletscherabbrüche generiert. Derartige Wasserwellen ereignen sich daher oft unerwartet und stellen eine bedeutende Naturgefahr dar, weil sie oftmals ganze Uferbereiche verwüsten oder an Talsperren überschwappen. Aufgrund der steilen Uferpartien, geringen Seebreiten, potentiell grossen Rutschmassen und der andererseits vielfach exponierten Lage von Siedlungen und Wasserbauwerken ist das Risiko von Impulswellen im Alpenraum besonders hoch. Die Generierung von Impulswellen im Eintauchbereich des Rutsches und deren Propagation im Nahbereich der Wellengenerationszone wurden in einem zweidimensionalen physikalischen Modell untersucht. Die massgeblichen Rutscheigenschaften wie Form, Volumen und Eintauchgeschwindigkeit wurden durch einen Pneumatikgenerator mit eingebauter Rutschbox gesteuert, welche die granulare Rutschmassein einen rechteckig-prismatischen Wellenkanal beschleunigte. Die Effekte der Eintauchgeschwindigkeit, der Rutschmächtigkeit, der granularen Rutschmasse und der Ruhewassertiefe auf die resultierende Impulswelle wurden unabhängig voneinander untersucht. Einzig der Eintauchwinkel = 45° längs der Hangneigungsrampe des Rutsches und der granulare Korndurchmesser wurden nicht variiert. Die Wellenprofile wurden von sieben kapazitiven Wellenpegeln aufgenommen, welche längs der Kanalachse in konstantem Abstand hintereinander angeordnet waren. Das turbulente Dreiphasengemisch aus Luft, Wasser und eintauchendem Granulat in der Wellengenerationszone wurde mithilfe von Particle Image Velocimetry (PIV) festgehalten, einer nicht-intrusiven Methode zur Aufnahme von instantanen Fliessgeschwindigkeitsfeldern. [.] Die aus dem physikalischen Modell hergeleiteten Dimensionierungsgleichungen wurden anhand von Feldmessungen einzelner Prototypen getestet, woraus sich eine zufriedenstellende Übereinstimmung ergab. Ausserdem wurden die Resultate aus den granularen Rutschversuchen auf Vergleichsmessungen mit starren Blöcken in demselbenphysikalischen Modell angewandt. Die resultierenden Abweichungen ergaben, dass starre und kompakte Blöcke beim Eintauchen in einen ruhenden Wasserkörper grössere Impulswellen als deformierbare und poröse Rutschkörper bei sonst identischen Rutschparametern erzeugen.…
Seller Inventory # 9783640588916
- Title
- Impulswellen: Effekte der Rutschdichte und der Wassertiefe
- Author
- Andreas Zweifel
- Publisher
- GRIN Verlag
- Publication year
- 2010
- Condition
- Neu
- Binding
- Taschenbuch
- Language
- German
- ISBN 10
- 3640588916
- ISBN 13
- 9783640588916
- Item weight
- 331 grams
- Dimensions
- 210x148x16 mm
"Synopsis" may belong to another edition of this title.
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|---|---|---|
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