INTRA- AND INTER-ANNUAL SEASONAL VARIATIONS OF VEGETABLE COVER (NDVI AND SAVI) IN THE RIPARIAN FOREST OF THE CAATINGA BIOME ASSOCIATED WITH THE SERRINHA II RESERVOIR, PE, BRAZIL AND THEIR CORRELATION WITH SPI AND ACCUMULATED WATER VOLUME
DOI:
https://doi.org/10.14393/RCG259970639Keywords:
MSI – Sentinel 2, Environmental regions, DroughtAbstract
Riparian forests are environmental regions that contribute to water purification and reduce vulnerability to flooding. This study aimed to analyze the seasonal variations in Caatinga vegetation cover near the Serrinha II Reservoir - PE, Brazil. The orbital data set consisted of images from the MSI - Sentinel 2 satellite from 2016 to 2021 between the rainy and dry periods. The spectral responses of the Normalized Difference Vegetation Index (NDVI) and Soil Adjusted Vegetation Index (SAVI) were evaluated and correlated with the Standardized Precipitation Index (SPI) and the volumetric variation of the reservoir. The results showed that the indexes indicated vegetation growth in the rainy season and reduction in the dry season. From 2016 to 2018, correlating the SPI with the indexes showed a reduction in vegetation due to drought events. From 2019 to 2021, there was a regeneration stage with a positive increase in SPI values. These events also led to a reduction in the reservoir's accumulated volume, which was lowest in 2017 (11.66 hm³). The association of SPI with the indexes made it possible to identify changes in vegetation cover and reservoir volume caused by rainfall deficits.
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Copyright (c) 2024 Ubiratan Joaquim da Silva Junior, Juarez Antonio da Silva Junior, Débora Natália Oliveira de Almeida, Ester Milena dos Santos, Anderson Luiz Ribeiro de Paiva, Sylvana Melo dos Santos, Leidjane Maria Maciel de Oliveira
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