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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary
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Abstract: The Diurnal Variability of the Water Amounts Fallen During Significant Rains in North-Western Romania. Based on the climatic data from 11 meteorological stations in North-Western Romania, the paper analyzes the diurnal variation of the water amounts recorded during the significant rains in the warm season (April-October), between 1975 and 2006. In the case of the hourly amounts determined by the average intensity of the rain, the highest diurnal values (over 2.0 mm/h) are registered in the afternoon and in the evening, as a consequence of the short-period rains, which are very frequent in summer. During the night, the highest amounts are registered for the rains of over 3 hours, more frequent in spring and autumn. A similar diurnal variation is characteristic for the water amounts determined by the maximal intensity. The difference is given by the fact that maximal values (of over 2.0 mm/h) occur in the lowlands and the valley corridors, where there is a lower frequency of such rains. In the case of hourly average amounts determined by the length of the rains, the highest values of the amounts determined by the average and maximal intensity (between 2.2 and 2.9 mm/h, and between 1.3. and 1.9 mm/h respectively) belong to the rains lasting between 1 and 2 hours. The frequency analysis of the water amounts in relation to the duration of the rains reveals the fact that, in the case of average intensity, the rains lasting more than 3 hours have more than 50% of the total of water amounts fallen, even if the frequency of such rains is only 31.6% of the total. In the case of the maximal intensity, the largest amounts are given by short rains, up to 2 hours. Keywords: diurnal variability, significant rains, average and maximum intensity, North-Western Romania. |
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