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| Titel |
External gravity oscillations in Lake Onega |
| VerfasserIn |
S. F. Rudnev, G. Salvadè, K. Hutter, F. Zamboni |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 13, no. 8 ; Nr. 13, no. 8, S.893-906 |
| Datensatznummer |
250011964
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| Publikation (Nr.) |
 copernicus.org/angeo-13-893-1995.pdf |
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| Zusammenfassung |
| Lake Onega is located in the southern part of
Karelia, in the north-west of Russia. We report data taken by various
limnigraphs and current meters and isolate, by spectral analysis, the most
conspicuous barotropic periods of these signals. The analysis that follows is
based on the linearized shallow-water equations, that are solved for the free
oscillations and thus identify the eigenperiods and corresponding mode
structures for this lake. Computational results are presented for a finite
difference representation for these surface-seiche equations applied to the
entire Lake Onega including its bays. The grid consists of quadratic elements of
1000 m side length corresponding to 9344 active cells. The emerging matrix
eigenvalue problem exceeds the storage and compuational capacity of standard PCs
or workstations and thus requires use of the approximate Lanczos procedure to
isolate the first ten eigenperiods and corresponding mode structures of the
barotropic seiches, lying between 12.1 and 2.2 h. Comparison of computational
results and inferences from the water level and current-meter records, disclose
satisfactory agreement between theory and observation. |
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