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unchanged, but even more evident.
By comparing bathymetric maps, it is quite evident that
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' PALUDE 3 f
Circulation of rising tide. Shaded areas indi-
eate "hummoek" areas; dotted line represents the
channels; and the black arrows indicate the main
flow pattern.
fact the lines, very pronounced by harmonic analysis, followthe
eourse of the smaller, natural canals. loreover, these areas
which are slowly submerged by the tide are detectable because
they present themselves as an obstacle to the flow pattern
eausing a slight thermal perturbation on the upper surface.
So even if the well-known infra'ed technique only surveys
the phenomena on their surfaces, it seems to be able to givean
analysis in a vertical sense. Of course this fact is caused by
the drift of the electrical signal due to the elaboration used.
Since the thermal signal was used in a non thermal way, the boun
dary layer effect must be confined to a shallow area and short
distances. It is for this reason, we are not concerned with
the amplitude of a thermal signal. To contain the contrast be-
tween the information from ground and water data, an ulterior
logarithmic compression is relayed by signals.