Powered by OpenAIRE graph
Found an issue? Give us feedback
https://dx.doi.org/1...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
versions View all 2 versions
addClaim

This Research product is the result of merged Research products in OpenAIRE.

You have already added 0 works in your ORCID record related to the merged Research product.

Resonanz und Anomale Dispersion bei Wasserwellen

Authors: Büsching, Fritz;

Resonanz und Anomale Dispersion bei Wasserwellen

Abstract

Bei der Auswertung seiner vor Sylt durchgeführten Naturmessungen hochenergetischer Brandungswellen war der Autor auf das bis dahin für Schwerewellen unbekannte Phänomen der anomalen Dispersion gestoßen. Unter Dispersion wird bei den meisten Wellenarten insbesondere die Abhängigkeit der Phasengeschwindigkeit (Wellenfortschrittsgeschwindigkeit) c[m/s] von der Frequenz f[Hz] bzw. von der Wellenlänge L[m] verstanden. Bei Schwerewellen ist diese normal und durch dc/df ≤ 0 bzw. dc/dL ≥ 0 gekennzeichnet, etwa vergleichbar den elektromagnetischen Wellen (EM-Wellen) im Bereich des sichtbaren Lichts mit der bekannten Abfolge der Spektralfarben. Resonanzen treten aber insbesondere auch bei EM-Wellen zusammen mit dem Phänomen der anomalen Dispersion mit dc/df > 0 bzw dc/dL < 0 auf. Als Ergebnis der Suche nach analogen Bedingungen bei Wasserwellen hat der Autor insbesondere zwei unterschiedliche Modellvorstellungen für (partiell) stehende Wellen im Zusammenhang mit resonanten Beckenschwingungen als anwendbar erkannt: In der Natur als Resonanz der von See kommenden Wellen (Erreger) mit partiell stehenden Halbwellen in einem abgrenzbaren Beckenvolumen (Resonator) und im verkleinerten Modell als Resonanz des Wellenerzeugers (Erreger) mit partiell stehenden Viertelwellen im Wellenkanal (Resonator).

Analyzing field measurements of high energetic surf waves, the author has come across an anomalous dispersion effect (ADE) that was previously unknown in connection with gravity waves. For most kinds of waves, dispersion means the dependence of phase velocity c[m/s] on frequency f[Hz] or on wave length [L] respectively. With gravity waves dispersion is normal, which means that dc/df ≤ 0 or dc/dL ≥ 0, - similar to what is known about electromagnetic waves (EM-waves) in the limited frequency range of the visible light (as demonstrated by the known sequence of spectral colors). With EM-waves, however, Resonances appear together with the phenomenon of an ADE, marked by dc/df > 0 or dc/dL < 0 respectively. Seeking analogue conditions for water waves, the author had found two different model conceptions to be appropriate for (partial) standing waves in connection with basin oscillations. In natural field conditions: incident waves from the sea (stimulator) resonating with partial standing half-waves in a definable water basin (resonator), and in a scale model: the wave maker (stimulator) resonating with partial standing quarter-waves in the wave tank (resonator).

Country
Germany
Keywords

ddc:620, komplexer Reflexionskoeffizient, basin oscillation, Phasensprung, energy spectrum, phase jump, Beckenschwingung, 620, standing wave, Energiespektrum, Veröffentlichung der TU Braunschweig, complex reflection coefficient, stehende Welle, ScholarlyArticle

  • BIP!
    Impact byBIP!
    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
Powered by OpenAIRE graph
Found an issue? Give us feedback
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Related to Research communities
Energy Research