Resumo

ECHEVERRI TAFUR, Leyder  e  OBANDO MONCAYO, Franco Humberto. RAINFALL EROSIVITY IN THE SOUTH CENTER ZONE OF THE DEPARTMENT OF CALDAS, COLOMBIA. Rev. Fac. Nac. Agron. Medellín [online]. 2010, vol.63, n.1, pp.5307-5318. ISSN 0304-2847.

Erosivity and temporal variation of rainfall were calculated, with annual rates Fournier index (AFI), Modified from Fournier index (MFI) and the Precipitation Concentration (PCI). We used the daily rainfall record of 10 years in 15 meteorological stations located in the central region - South of the department of Caldas. The AFI was estimated by four procedures (AFI₁, AFI₂, AFI₃ and AFI₄), the MFI through two methodologies (MFI₁ e MFI₂), like the PCI (PCI₁ and PCI₂). Through a matrix of Spearman correlation coefficients, were highly significant linear correlations between AFI₁, AFI₂, AFI₃, MFI₁ and MFI₂. Between the first two procedures, there was a correlation coefficient (r=0.91) and between MFI₁ and MFI₂ (r=0.97). The AFI₄ did not correlate with any of the procedures. Moreover, according to PCI₁, the average monthly precipitation is distributed uniformly, following the trend bimodal characteristic of the Andean region of Colombia, concentrating about 70% of the annual volume of rainfall during the wetter seasons (March-April-May and September-October-November). The study suggests that the risk of water erosion may be greater in the zone of influence of the climate stations in the municipalities of Manizales, Chinchiná and Palestine, located within the altitudinal range between 1010 and 1800 meters above sea level, specifically in the central coffee zone in the department of Caldas.

Palavras-chave : Rainfall; erosivity; AFI; MFI; PCI.

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