The weather modification technologies designed to mitigate hail damage for economic and social objects become more and more demanded, despite ambiguous estimates of their results and thus expediency of their practical use [15,17]. In this connection, results of antihail work in the areas where this activity lasts for many years are of direct scientific and practical interest. The Republic of Moldova is a good example of such an area. Antihail shield, based on the rocket technology of reagent injection into the cloud, has been under operation for more than 40 years. In the paper, the conceptual basis of hail-dangerous Cb cloud modification technique are presented along with some data on modification results during the last 10 years; an optimistic estimate of the antihail shield efficiency in the country is obtained.
Generalized are the results of the research carried out by the Special Service for Weather Modification of the Republic of Moldova and of the features of formation and evolution of cumulonimbus clouds Cb based on studying their radar echo in the Lagrange (moving) coordinate system. Besides the regularities proceeding from the ideas about the evolution of Cb on the sides of atmospheric mesoscale structures [16], the features of evolution of powerful Cb are revealed at the significant wind shear. The direction and evolution features of Cb can be predicted using the wind hodograph in the troposphere plotted in the moving coordinate system. Results of the research are used in the Special Service for Weather Modification of the Republic of Moldova during the operational activities on hail suppression for predicting the areas of formation of new convective cells and for optimizing the size of the areas for their seeding with the crystallizing reagent.
Basing on statements of general theory of systems, possibilities are considered to use the Lotki-Volterra model describing behavior of the system of consumer-resource (object-resource) for biological populations, in description of evolution elements of convective cloud (convective cell). The obtained results lead to a conclusion on applicability of the approach to the mentioned purposes.
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