Análisis de las principales sequías edáficas ocurridas en la provincia de Buenos Aires
Keywords:
sequías, balance de aguaAbstract
The rainfall registered in different time-spans is the weather component commonly used to determine the intensity of droughts, when it is compared with long series of precipitation average values and expressed as a desviation. However, from an agrometeorological point of view, only the knowledge of the soil water balance enables the correct definition of the duration and intensity of droughts. Using the methodology of the daily water balance with a lineal retention curve, the more intense droughts of the periods 1916-17,1924-25; 1927-1928; 1937-38; 1942-43; 1949-50; 1956-57 and 1978-79, registered in the Province of Buenos Aires, were studied. The analysis were made with data of about 130 pluviometric stations, with a minimum record of70 years (1911-85 in the majority of them), using the standard daily potential evapotranspiration evaluated after Penman's equation. The theoretical frequency distribution adopted was the Beta (I) function, which adegnatly fits the water storage values. The probability of ocurrence of the edaphic water storage values were computed for the abovementioned historic droughts. Their distribution, intensity and recurrence period were then established, as a tool of great utility for every dry barren land agricultural planning.
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References
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