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  • 1
    Electronic Resource
    Electronic Resource
    Stehende interne Wellen in rechteckigen Becken (1970)
    Springer
    Ocean dynamics 23 (1970), S. 61-79 
    Details
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary A method is described for generation of standing internal waves in rectangular tanks by varying air pressure at the surface periodically. So the main part of the spectra of eigenoscillations of the stratified water can be generated. The vertical amplitudes of internal waves are measured by conductivity probes. It is shown that these internal waves can be described by perturbation equations of the first order. The damping of free internal waves are caused by friction at the walls. The attenuation is measured and calculated approximately.
    Abstract: Résumé On décrit une méthode expérimentale de production d'ondes internes stationnaires dans un bassin rectangulaire par variations périodiques de la pression atmosphérique à la surface. On peut, de cette manière, reproduire une grande partie du spectre des oscillations propres de l'eau salée stratifiée. Les amplitudes verticales des ondes internes sont mesurées par sondages de la conductibilité. On montre que des ondes internes, même de grande amplitude, peuvent être décrites par des équations de perturbation du 1er ordre. L'amortissement d'ondes internes libres est dû presque exclusivement au frottement contre les parois et on en donne la mesure par un calcul approché.
    Notes: Zusammenfassung Es wird eine Versuchsanordnung zur Erzeugung stehender interner Wellen in rechteckigen Becken durch periodische Luftdruckschwankungen beschrieben, mit der sich ein wesentlicher Teil des Spektrums der Eigenschwingungen der geschichteten Salzlösung erzeugen läßt. Die vertikalen Amplituden der internen Wellen werden durch Leitfähigkeitssonden gemessen. Es wird gezeigt, daß interne Wellen auch großer Amplitude durch Störungsgleichungen 1. Ordnung beschrieben werden können. Die Dämpfung freier interner Wellen beruht fast ausschließlich auf Haftreibung an den Wänden. Sie wird durch eine Näherungsrechnung bestimmt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02226223
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    Paper (German National Licenses)
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  • 2
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    Stehende interne Wellen in rechteckigen Becken (1970)
    Springer
    Details
    Publication Date: 1970-03-01
    Print ISSN: 0012-0308
    Electronic ISSN: 1616-7228
    Topics: Geosciences , Physics
    Published by Springer
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    PAPER CURRENT
  • 3
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    Stehende interne Wellen in rechteckigen Becken (1969)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 64 pp
    Details
    Publication Date: 2017-09-15
    Type: Thesis , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 4
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    Baltic 75 : physikalischer Teil ; Messungen des IfM, der FWG und der DFVLR (1975)
    Institut für Meereskunde Kiel
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 011 . Institut für Meereskunde Kiel, Kiel, Germany, pp. 1-100, 100 pp.
    Details
    Publication Date: 2016-10-06
    Type: Report , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 5
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    Ein Schleppkabel zur Messung räumlicher Temperaturprofile : technischer Bericht (1972)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-06
    Description: Es wird der Aufbau eines 50 m langen Schleppkabels beschrieben, das 30 zweipolige Stecker im Abstand von 1,5 m trägt, an die Sensoren zur Messung ozeanographischer Parameter angeschlossen werden können. Zur Reduzierung des Strömungswiderstandes und zur Dämpfung von Vibrationen wird das Kabel mit Kunststoffflossen verkleidet. Als Depressor dient ein Jalousie-Drachen, mit dem Schleppgeschwindigkeiten bis zu 12 kn möglich sind. Gegenwärtig werden an die Stecker 30 NTC-Widerstände angeschlossen, die auf eine gemeimame Kennlinie abgeglichen worden sind. Die Temperaturen werden mit Hilfe einer digitalen Datenerfassungsanlage auf Lochstreifen registriert. The construction is described of a 50 m cable supplied by 30 connectors with two contacts at distances cf 1.5 m in order to attach oceanographic instruments. For the purpose of reducing drag forces and vibrations the cable is faired with plastic fins. With a depressor shaped like a Venetian blind towing speeds up to 12 kn are possible. At present 30 NTC-resistors are used, adjusted to an identical temperature reponse. The temperatures are measured by means of a digital data Iogging system and printed on punch tape.
    Type: Article , NonPeerReviewed
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  • 6
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    Currents and stratification in the Belt Sea and the Arkona Basin during 1962-1968 (1973)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-10
    Description: A great number of observations, mainly on temperature and current fluctuations in the Arkona Basin, have been made during the years 1962-1968 (figs. 2 and 4). Corresponding to the wind conditions over the Baltic Sea (mean value about zero, fluctuations of about 5 m sec-1), currents and stratification are extremely variable. The mean currents in fig. 7 are towards NE for the entire eastern part of the Arkona Basin, but the actual flow can have any direction (fig. 32). The current fluctuations are non-Gaussian (fig. 10). The mean stratification in the Arkona Basin underlies also great variations. Temperature fluctuations of 8°C and salinity fluctuations of 3 ‰ occur within 2 days (fig. 5). In the mean thermocline level we find also in the central part of the Arkona Basin a current towards NE (fig. 9). The current spectra of the Belt Sea and the Arkona Basin are principally of the same shape, but inertial waves do not occur in the Belt Sea (fig. 13). The mode decomposition reveals the strongest baroclinity in the period range from approximately 10h - 40h; at the inertial frequency the major baroclinic mode contains 10 times the energy of the barotropic one (fig. 28). The spectrum of the barotropic mode corresponds to the spectrum of the windstress whereas the spectra of the internal modes correspond to divergence and curl of the stress field (fig. 28). The strongest signal are the inertial currents. In general their wave length seems to be short; they consist of at least 4 internal modes and the barotropic one (fig. 37). The Reynolds stress clue to inertial waves leads to negative viscosity (fig. 40). The seiches currents are very weak compared to the inertial currents. The oscillations in the Arkona Basin seem to be short-crested and strongly influenced by Bornholm and the Rönne Bank. Towed thermistor cable records lead to the conclusion that several features of the temperature structure are of quasi-permanent character.
    Type: Article , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 7
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    On the observation of internal tides at the continental slope off the coast of Norway (1973)
    Bornträger
    Details
    Publication Date: 2022-06-20
    Description: At first a technique is presented to evaluate repeated hydrographic sections. In order to separate the periodic variations and the fluctuations which arise as a result of the horizontal motion of the profiling ship, the data at defined locations are averaged relative to time. The procedure of averaging can be applied successfully to sets of sections repeated at a constant rate under the assumption that the spatial field is approximately stationary during the time of observation and that the energy of the overlapping temporal processes is concentrated over a few spectral bands. In these cases, the mean spatial distribution can be expected as a result. The periodic part is extracted as the deviation of the actual sections from the averaged section. This procedure was applied to a set of observations made at 28 discrete stations along a triangular course at the continental shelf off the coast of Norway during the expedition "Norwegian Sea 1969". Temperature sections were repeated six times at an interval of 18 hours. The average section shows the expected downsloping of the isotherms perpendicular to the continental shelf corresponding to the Norwegian current. lt turns out that the fluctuations with respect to time during the period of observation are probably produced by semidiurnal internal tides. Wavelength and phase velocity are estimated to be A = 22 km and c = 0.5 ms-1 respectively. The waves progress towards the shelf at right angles. For depths of 250-500 m at the continental slope a considerable amplification of wave is noticed.
    Type: Article , PeerReviewed
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  • 8
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    Evidence of increased turbulent mixing in the coastal jet of the NW-African upwelling region (1976)
    Bornträger
    Details
    Publication Date: 2022-06-22
    Description: Temperature data are presented which were obtained by means of a towed thermistor cable during the expedition "Auftrieb '72" in the immediate vicinity of the continental slope within the NW African upwelling region. While most of the data have been sampled on the offshore side of the upwelling front, the front is crossed on a few occasions, and some data cover the area of the upwelling coastal jet. They reveal a very deep homogeneous surface ]ayer within the coastal jet, indicative for increased turbulent mixing. These conclusions from the temperature sections are confirmed by the temperature and salinity data from CTD casts made in the same area at the same time. In spite of the complicated hydrography of the area and the large number of water masses involved, the existence of a zone of increased turbulent mixing within the jet is indicated in the data.
    Type: Article , PeerReviewed
    Format: text
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