Quantifier la sécheresse. Durée, intensité, fréquence

Iulian Cătălin Stângă

Abstract


Drought quantification: duration, intensity, frequency. Using data from seven meteorological stations and 27 rainfall gauges from the eastern part of Romania (Tutova Hills), the present paper desires to evidence more clearly the real significance of drought phenomena by a methodological approach. This was done with the help of some distinct expressions, resulted from the processing of monthly and daily values of the climatic parameters: rainfall decimal logarithm index, equivalent drought and the synthetic index of drought intensity, rainfall anomaly index, Palfai aridity index, Walter-Lieth climogram. Using the rainfall monthly values, the author propose two index, one for drought assessment (Rainfall Decimal Logarithm Index), the other with a climatic significance (continentalism index). The most exact expression is based on the daily values of the rainfalls (equivalent drought and synthetic index of drought intensity). Equivalent drought shows the length of the interval lacking precipitations, characterized by similar consequences in different temperature conditions, and it was computed by reporting water consumption (evapotranspiration) according to a series of elements standard considered. The synthetic index of drought intensity (severity) has been proposed taking into consideration both the length of the drought interval as well as its mean temperature (practically expressing water consumption), to which is added and the sum of precipitations from a previous interval (to approximate the easily and directly accessible crop water reserves).


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DOI: http://dx.doi.org/10.15551/scigeo.v55i0.26

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