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Authors: Locritani, Marina* 
Carmisciano, Cosmo* 
Bruni, Federico* 
Filippini, Michele* 
Title: The environmental characterization of Lake Vättern and the AUV test for the Clean Sea project
Issue Date: 2018
Series/Report no.: 392 / (2018)
Keywords: Lake Vättern
Clean Sea Project
Abstract: Clean Sea (Continuous Long-term Environmental and Asset iNtegrity monitoring at SEA) project [Gasparoni et al., 2013a] concerns the use of commercially AUV [Gasparoni et al., 2013b] with a modular interchangeable payload for environmental monitoring and inspection tasks around Eni oil & gas offshore infrastructures. The platform identified for the development of the project was SAAB Seaeye Sabertooth. The project defined peculiar hardware and software architecture, where the payload controller is separate from the AUV controller and able of modifying “in real time” the mission strategy [Buffagni et al., 2014]. The environmental payload chosen for AUV was: Temperature [°C], Salinity [psu], Methane [μmol/l], Colored Dissolved Organic Matter [ppb], Chlorophyll [μg/l], Turbidity [m-1 sr-1], Oxygen [μmol], Oxygen [%], Polycyclic Aromatic Hydrocarbons [μg/l], pH, Oxidation Reduction Potential [mV]. The Lake Vättern (Figure 1), the sixth largest lake in Europe and the second largest lake in Sweden after Lake Vänern, has been chosen as test field for the first AUV ascertainment. In detail, 36 tests have been realized in two different sites (Figure 1), located in the North-East (latitude 58°32’32.27”N, longitude 14°58’9.03”E) and North-West (latitude 58°32’32.27”N, longitude 14°58’9.03”E) side of the Lake, from November, 2012 to July 2013. The aim of this report is the Lake Vättern characterization made by on-line available data, needed to support the AUV mission planned and to evaluate the data acquired during the tests. The most significant tests results are: the spatial and seasonal variation of measured parameters during the tests, and the comparison between the historical data free available on-line and the data acquired during the tests.
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