Abstract

CORTEZ-VILLA, Janeth; QUEVEDO-NOLASCO, Abel; ARTEAGA-RAMIREZ, Ramón  and  CARRILLO-FLORES, Guillermo. Trend of meteorological drought in the state of Durango by the Rodionov method. Tecnol. cienc. agua [online]. 2020, vol.11, n.1, pp.85-131.  Epub May 30, 2020. ISSN 2007-2422.  https://doi.org/10.24850/j-tyca-2020-01-03.

Drought is the natural phenomenon that affects the most people in the world, until the last consequence, the death of plants, animals, and humans. To evaluate the possible damages it causes, drought indices were developed that facilitate its quantitative analysis to carry out planning and management of water resources. However, there are currently changes in the global climate system, which cause drought conditions of greater intensity, duration, and frequency. Therefore, changes were detected with the Rodionov method in the SPEI (Standardized Precipitation Evapotranspiration Index) and SPI (Standardized Precipitation Index) indices at 6- and 12-month scales in the state of Durango, Mexico. We analyzed the trends of changes in the mean (RSI) and variance (RSSI) of the indices in 49 stations of the SPI index for 6 months and in 45 of the SPEI index for 6 months. The RSI values identified the beginning of the drought periods, most of the maximum RSI values were presented in July 1992. Trends in the frequency of RSI values decreased during the 2000-2004 period and increased during 2005-2008. The decade of greatest changes in the average was 1990-1999. The highest frequency of RSSI values was in the 1985-1989 period, the changes have remained constant during the last 20 years. The decade of greatest change in variance was 1980-1989.

Keywords : Durango; drought; SPEI; SPI; Rodionov; mean changes; changes of variance.

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