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| Titel |
Barotropic response in a lake to wind-forcing |
| VerfasserIn |
Y. Wang, K. Hutter, E. Bäuerle |
| 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 ; 19, no. 3 ; Nr. 19, no. 3, S.367-388 |
| Datensatznummer |
250014226
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| Publikation (Nr.) |
 copernicus.org/angeo-19-367-2001.pdf |
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| Zusammenfassung |
We report results gained
with a three-dimensional, semi-implicit, semi-spectral model of the shallow
water equations on the rotating Earth that allowed one to compute the
wind-induced motion in lakes. The barotropic response to unidirectional, uniform
winds, Heaviside in time, is determined in a rectangular basin with constant
depth, and in Lake Constance, for different values and vertical distributions of
the vertical eddy viscosities. It is computationally demonstrated that both the
transitory oscillating, as well as the steady state current distribution,
depends strongly upon the absolute value and vertical shape of the vertical eddy
viscosity. In particular, the excitation and attenuation in time of the inertial
waves, the structure of the Ekman spiral, the thickness of the Ekman layer, and
the exact distribution and magnitude of the upwelling and downwelling zones are
all significantly affected by the eddy viscosities. Observations indicate that
the eddy viscosities must be sufficiently small so that the oscillatory
behaviour can be adequately modelled. Comparison of the measured current-time
series at depth in one position of Lake Constance with those computed on the
basis of the measured wind demonstrates fair agreement, including the
rotation-induced inertial oscillation.
Key words. Oceanography: general
(limnology) – Oceanography: physical (Coriolis effects; general circulation) |
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