Padrões Espaciais e Temporais de Episódios de Seca no Estado do Rio Grande do Norte

Abstract

As droughts represent the most complex and harmful type of natural disaster, this has been affecting the state of Rio Grande do Norte for many years. The SPEI index is determined for different time scales, with multiple and different characteristics in different climates. Index indices (SPEI) are calculated based on weather data from INMET stations collected from 1950 to 2018. In this study, the SPEI index was associated with multivariate cluster analysis statistics using the K-means method for a definition. homogeneous regions of drought, where 05 groups were identified by microregions of the state. This article aims to identify the types of drought that occur in the state of Rio Grande do Norte through the SPEI index and cluster analysis from 1950 to 2018. according to their classification. It was observed for all groups, and there was a higher incidence of moderate drought, significantly present in all 05 groups. The largest dry class, according to its duration not found in group G4, was already recorded in groups G1 and G5, and in groups G3 and G5, but with shorter duration. Extractions were included in the years

Water quality in underground dam areas in the semiarid region of rio grande do norte, Brazil

“…The present evaluated the water quality in 45 underground dams (Figure 1 The underground dams in the state are in areas with a BSh climate, hot semi-arid, according to the Köppen classification. These areas present mean annual rainfall depths of 250 to 750 mm, in a rainy season from summer to autumn with high distribution irregularity and evaporation rates, and mean annual potential evapotranspiration of 1,500 mm (DINIZ; PEREIRA, 2015;DUBREUIL et al, 2018;LIMA et al, 2019a).…”