Field data – CTD (Conductivity, Temperature, Depth)
To gain information on the hydrophysics
of the two water bodies within
the target area a number of vertical
temperature profiles were measured with a light weight
CTD (Sea & Sun Technology). The instrument which was applied
for this survey was a multi-parameter
probe (CTP173), which additional
to the water temperature provided pressure, conductivity,
dissolved oxygen, pH and turbidity
data.
To provide a general overview on the spatial distribution of the
water temperature within the two lakes a number of high resolution
vertical profiles were measured at selected positions. Due to the
high accuracy and resolution of the instrument and the fast measuring
procedure it was possible to gain within a short period of time
a quasi-synoptic three-dimensional picture about the water temperature
and conductivity of the entire water body.
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CTD-Locations
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Temperature and Conductivity
Profiles [1-8]
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Within the area close to the inflow location (CTD-1) the vertical
temperature profiles reveal a water
body which is completely mixed,
whereas at locations 2, 3 and 4 the build-up of a layering due
to the solar radiation can be observed.
In the centre of the lake (CTD-3),
where the solar radiation has highest impact, the temperature
difference between bottom and surface
water is as high as 3.5 °C.
Unlike to the temperature layering
the conductivity remains constant
all over the two lakes.
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