lake pusiano field experiment: first preliminary results greg attwater & diego copetti,...
TRANSCRIPT
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Lake Pusiano field experiment: first preliminary results
Greg Attwater & Diego Copetti, Supervisors: Giannni Tartari & Jorg Imberger
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PART 1: CWR Equipment
SCAMPMeasures extremely small scale fluctuations (few mm) in temperature and conductivity (Carter & Imberger, 1986)
by Greg Attwater
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Lake Diagnostic System (LDS)LDS combine a weather station measuring wind, air temperature, relative humidity, short wave radiation and net long wave radiation with a thermistor chain . Using the LAKEMON software, the system is used to monitor the strength of mixing activity in a water body by using Lake Number concept. Robertson & Imberger (1984).
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F-ProbeA fine scale profiler using commercially available sensors for the measurement of temperature, conductivity, oxygen, pH and turbidity (Fozdar et al., 1985)In this experiment the F-Probe has been dropped with the Fluoro probe in order to obtain information on the distribution of 4 algal groups, total clorophyll a and DOC.
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Why?
Scientific goals: to investigate on the bluegreen – green algal shift between 2002 and 2003;
to study the mechanism involved in the formation of the plankton patches. Distinguishing between physical, chemical and biological causes;
Applied goal: to study the ecology of the Lake Pusiano during the stratification period in order to obtain a detailed description of the nutrients circulation and their effect on the phytoplankton populationand suggest adequate strategies in order to obtain an ecological recover of the lake.
Part 2: Scientific Issues
by Diego Copetti
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LDSmeteorological parameters
thermal structure
SCAMPwater column stability
F-ProbeTransport process
WQ samplingnutrient availability
Biological response
Biological sampling Fluoro probePhosphorus bioavailable
experiment
PAR
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Experimental plan
LDS
SCAMP
hydrochemical parameters:P6, P18, P21biological parametersP3, P19, P11, P15, P21PARP3, P6, P21, P11, P15, P16, P18, P20
Bioavailable phosphorus concentration experiment
WE transect
NS transect
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ELCOM - CAEDYM
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Results: meteorological data and thermal structure
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During 25 July 2003 intense wind produce regular high frequency wave
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SCAMP profile 209 day
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2002 hydrodynamic model (DYRESM)
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The data collected during the Pusiano field experiment 2003 appear very consistent;
The first elaborations of the physical dataset underline the production of regularhigh frequency internal wave;
It is evident an anisotropy distribution of the phytoplankton community aggregatedin patches;
The results obtained during the field experiment will be the starting point of the restoration plan of the lake, particularly in the evaluation of the nutrient internalload.
Conclusion