Ulteriori esperienze geofisiche sul lago di Caldouazzo. Morfologia ed origine delle sesse. Dati microtermologici. Progressivo insabbiamento elei piccoli lagbi*.



The limnographic, barographic and tliermological recordings,
taken in a week of October of the years 1906, 1967 and 1971 on
the Lake of Caldonazzo, are reviewed. The properties of free uninodal,
binodal etc. oscillations of the Lake have been examined, once again with
the result that they coincide with the values previously elaborated theoretically:
the amplitudes of uninodals in the North (Lido di San Cristoforo)
are about twice as large as those measured in the extreme South (Lido di
Caldonazzo); the behaviour of uninodals in the Northern part of the Lake
(besides the uninode) in conformity with the theory, etc.
The simultaneous function of a microbarograph, mounted near the
Lido of San Cristoforo, proved that the main, if not exclusive, reason of
the seiches lies in the interaction between the atmosphere and the hydrosphere.
The passage of even the slightest pressure variations above the
Lake, with rhythms of 10m, 5m, . . . cause an immediate response of the
Lake by free uninodal, binodal. . . oscillations, and the amplitude of water
oscillations is all the larger the more the period of perturbing causes approaches
the period of the corresponding free oscillation, in other words,
the more it approaches resonance.
Observations on microvariations of temperature have been made as
well which may occur on very short periods (in the order of 1 -2 sec) and
give evidence of a swift brownian motion of liquid molecules. This
must have a considerable influence on the Lake's microbiology. The increase
of the period of uninodals, against the period of batliymetric mea-

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DOI: https://doi.org/10.4401/ag-5105
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X