The new integral parameter, such as the ratio of the lake's perimeter to lake's area, is proposed for estimation of the trophical state of lakes and their classification. The trophical state of lakes on the Shatsk National Nature Park territory has been analyzed, and the comparison of different parameters, which are used for estimation of the trophical state (for example, the Carlson index on a transparency, chlorophyll index, oxygen concentration, etc.) has been carried out. It is shown that the proposed parameter well reflects the trophical state of a lake. Advantages of this parameter are established: simplicity of determination (from mapping documents, such as topographical maps, plans, aerial maps), informativity, firmness to short-term changes of meteorological and other conditions, possibility of application in the development of a strategy of lakes' treatment.

• Кошовий Володимир Вікторович (фізико-математичні науки)
• Романишин Ігор Михайлович (педагогічні науки)
• Романишин Ігор Михайлович (технічні науки)

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