Analysis of meteorological drought for Dagua river basin, Valle del Cauca, Colombia

Abstract

Context: Extreme climatic events causes great challenges for social, economic and environmental sustainability of a region. Droughts affect agricultural activities significantly thus endangering the livelihoods and food security of rural populations, this is especially crucial for developing countries. The objective of this study is to characterize meteorological drought in Dagua river basin, Valle del Cauca. Method: Intensity, magnitude, duration and frequency of drought events was estimated using the Standardized Precipitation Index (SPI), for semi-annual and annual groupings with records of 19 stations, during the period 1982-2011 Results: At least one drought was identified in each series; the area near to the subxerofític Basin region, exhibits more frequency of extremely strong drought and lower threshold of minimum precipitation; the largest percentage of spatial coverage of drought coincides with El Niño phenomena events, such as those that occurred in 91-92 to 09-10. Conclusions: The results obtained provide an approach for prediction and characterization of drought, and offer inputs to generate strategies for planning and mitigation of their impacts.

Keywords

• Cuenca del río Dagua, Fenómeno El Niño Oscilación del Sur, Índice Estandarizado de Precipitación (SPI), Sequías meteorológicas.