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Universidade Federal de Pernambuco (UFPE) 2016

Variabilidade pluvial no semiárido brasileiro : impactos e vulnerabilidades na paisagem da bacia hidrográfica do rio Moxotó

ALVES, Keyla Manuela Alencar da Silva

Titre : Variabilidade pluvial no semiárido brasileiro : impactos e vulnerabilidades na paisagem da bacia hidrográfica do rio Moxotó

Auteur : ALVES, Keyla Manuela Alencar da Silva

Université de soutenance : Universidade Federal de Pernambuco (UFPE)

Grade : Doutor em Geografia (2016)

Résumé
This research aimed to understand environmental changes aspects (climate and vegetation cover), and the impacts and vulnerabilities produced by those changes in Moxotó watershed, located in semiarid. In order to investigate the environmental changes, Mann-Kendall trends test was applied to analyze precipitation trends by using a series of 84-year data obtained from 38 meteorological stations, and to evaluate space-temporal changes in vegetation cover NDVI method was used through Landsat 5 and 7 imagery. The data provided by these methods permitted to observe the impacts and served as indicators of climate change vulnerability index. The results of Mann-Kendall test showed that trends of precipitation in Moxotó watershed are not homogeneous ; and the analysis of vegetation cover behavior demonstrates that native vegetation is well-preserved in higher altitude areas and residual landforms of Jatobá sedimentary basin. Indicators used to construct the climate changes vulnerabilities index were selected trough their conceptual/scientific relation between climate changes and the study area. Therefore, social, economic and physical indicators were selected and clustered in three sub- indexes (exposure, sensibility and adaptive capacity), each one represented the climate variability and changes in vegetation cover, social and economic vulnerabilities and positive aspects that favors adaptation to climate change, respectively. The outcomes obtained through the sub-indexes and final index presented that Jatobá, Ibimirim and Tupanatinga municipalities presented the highest vulnerability levels to climate changes. Based on the results and analysis mentioned, became evident the importance of researches in social and environmental vulnerabilities issues to support the understanding of climate changes effects on social and environmental systems.

Mots Clés : climate changes ; Moxotó watershed ; NDVI ; precipitation trend ; vulnerability

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Page publiée le 28 août 2017