首页|Development of an annual drought classification system based on drought severity indexes

Development of an annual drought classification system based on drought severity indexes

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  • NSTL
  • Acad Brasileira De Ciencias
In order to characterize the occurrence and intensity of droughts in the Doce River Basin, as well as to develop a system for its classification, four different drought indexes were evaluated: Percent of Normal Precipitation (PNP), Deciles Method (DM), Rainfall Anomaly Index (RAI) and Standardized Precipitation Index (SPI). The indices were calculated annually, based on precipitation data from 89 rainfall stations of the Brazilian National Water Agency (ANA). Nine analysis units (AUs) were determined in the basin and the Thiessen Polygons method was used to obtain the average precipitation in the respective drainage areas. The indices were calculated for each AU and then related to the drought intensity classes. An overall classification of the indices was proposed for the drought classification system for a 30-year base period, from 1985 to 2015. The most critical hydrological years of the Doce River Basin in relation to the drought were 1994/1995, 2000/2001 and 2014/2015, the latter being the most critical of the last 30 years. The results show that the annual drought classification system proved to be efficient in the identification of events, allowing to verify that the Doce River Basin presents a severe climatic drought condition, on average, every seven years.

climatic conditionDoce riverprecipitationrainfall seasonriver basin

Lima, Rafael P. C.、Da Silva, Demetrius D.、Pereira, Silvio B.、Moreira, Michel C.、Passos, Jessica B. M. C.、Coelho, Clivia D.、Elesbon, Abrahao A. A.

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Univ Fed Vicosa, Dept Engn Agr, Av PH Rolfs S-N,Campus Univ, BR-36570000 Vicosa, MG, Brazil

Univ Fed Oeste Bahia, Ctr Ciencias Exatas & Tecnol, Rua Prof Jose Seabra de Lemos 316, BR-47808021 Barreiras, BA, Brazil

Inst Fed Educ Ciencia & Tecnol Espirito Santo, Unidade Colatina, Av Arino Gomes Leal 1700, BR-29700060 Colatina, ES, Brazil

2019

10.1590/0001-3765201920180188

Anais da Academia Brasileira de Ciências

Anais da Academia Brasileira de Ciências

ISSN：0001-3765
年,卷(期)：2019.91(1)
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