Key questions of sampling frequency estimation during system calibration, on the example of the Kis-Balaton Water Protection System’s data series
Keywords:
sampling frequency estimation, monitoring system calibration, variogram, Kis-Balaton Water Protection SystemAbstract
In this study the practice of sampling frequency estimation is described on data series from the Kis-Balaton Water Protection System. The main aim was to point out the milestones, and common problems of sampling frequency estimation using variograms. Firstly, the importance of sampling frequency estimation during the calibration of the system is emphasized, embedding it in the idea of sustainable development. The applied method itself, the variogram is then discussed. This is a function used in geostatistics; basically, it is the expected squared increment of the values between locations x and y (Wackernagel, 2003). The results of the variogram analysis pointed to a series of problems and solutions which must be faced when an attempt is made to prepare the data sets for analysis. These problems mainly concern the removal of periodicity as a “special trend”. The final results explicitly show a 7 day (or less) sampling frequency is needed in the case of the total phosphorous parameter in order to permit long term assumptions and interventions to be based on it. The method described in the article can be used in the analysis of many other parameters complying with the needs of the variogram analysis, so it may prove to be highly useful to any scientist working with data received from sampling.
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Copyright (c) 2011 Kovács József, Hatvani István Gábor, Székely Kovács Ilona, Jakusch Pál, Tanos Péter, Korponai János
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