HISTORICAL SERIES AS TOOLS FOR VERIFICATION OF SEASONAL THERMAL AND CHEMICAL STRATIFICATION ON WATER QUALITY
Keywords:
Lentic environment, chemical and thermal profiles, permutation test, descriptive statistics, stratification, water quality monitoringAbstract
Water quality in reservoirs usually is monitored according to the energy company monitoring program, which is approved by de environmental agency for licensing purposes. These programs provide robust databases. However, rarely the water quality historical series are evaluated in a detailed way. Thus, aiming to expand the knowledge towards Vossoroca water quality characteristics, water quality data from 2005 to 2017 were evaluated. The specific objectives were: to identify each parameter variability along the depth and through time, to verify the influence of seasonality in thermal and chemical profiles of the reservoir and to point out the water quality parameters that varied the most with depth and seasonality. In order to comprehend the temporal dynamics of the reservoir related to seasonality and depth, box plot profiles were produced for each variable. Moreover, descriptive statistics tools, such as variation coefficients and medians, as well as inferential tools, such as the permutation test, were applied. The historical data studies pointed out the tendency to stratification of the water column especially on summer and spring.
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