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| Titel |
Surface seiches in Flathead Lake |
| VerfasserIn |
G. Kirillin, M. S. Lorang, T. C. Lippmann, C. C. Gotschalk, S. Schimmelpfennig |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 6 ; Nr. 19, no. 6 (2015-06-03), S.2605-2615 |
| Datensatznummer |
250120730
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| Publikation (Nr.) |
 copernicus.org/hess-19-2605-2015.pdf |
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| Zusammenfassung |
| Standing surface waves or seiches are inherent hydrodynamic features of
enclosed water bodies. Their two-dimensional structure is important for
estimating flood risk, coastal erosion, and bottom sediment transport, and for
understanding shoreline habitats and lake ecology in general. In this work,
we present analysis of two-dimensional seiche characteristics in Flathead
Lake, Montana, USA, a large intermountain lake known to have high seiche
amplitudes. To examine spatial characteristics of different seiche modes, we
used the original procedure of determining the seiche frequencies from the
primitive equation model output with subsequent derivation of the spatial
seiche structure at fixed frequencies akin to the tidal harmonic analysis. The
proposed procedure revealed specific seiche oscillation features in Flathead
Lake, including maximum surface level amplitudes of the first fundamental mode
in straights around the largest island; several higher modes appearing
locally in the vicinity of the river inflow; the "Helmholtz" open harbor
mode, with the period approximately twice that of the longest seiche mode,
generated by a large shallow bay connected to the main lake basin; and
several rotating seiche modes potentially affecting the lake-wide
circulation. We discuss lake management problems related to the
spatial seiche distribution, such as shoreline erosion, floods, and transport
of sediments and invasive species in Flathead Lake. |
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