Rainfall Variability and Vegetation Cover Dynamics in the Northern Part of the Southern Rivers: from Basse Casamance (Senegal) to Rio Gêba (Guinea Bissau)

Dome Tine, Mbagnick Faye and Guilgane Faye
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Dome Tine: Cheikh Anta DIOP University of Dakar, Department of Geography, Applied Remote Sensing Laboratory (ARL), BP 5005, Dakar, Senegal
Mbagnick Faye: Cheikh Anta DIOP University of Dakar, Department of Geography, Laboratory of Climatology and Environmental Studies (LCE), BP 5005 Dakar, Senegal
Guilgane Faye: Cheikh Anta DIOP University of Dakar, Department of Geography, Physical Geography Laboratory, BP 5005 Dakar, Senegal

International Journal of Research and Innovation in Social Science, 2022, vol. 6, issue 9, 159-166

Abstract: The aim of this contribution is to analyse the impact of rainfall variability on vegetation cover dynamics in the northern part of the Southern Rivers. The methodology adopted is based on the processing of rainfall data (1961-2018), Landsat satellite images and time series of Normalized Difference Vegetation Index (NDVI). The results show a highly contrasted rainfall variability, highlighted by the Standard Precipitation Index (SPI). The latter shows that annual variations in rainfall are slightly in favour of drought. The temporal profile of the NDVI revealed two periods with different rates of change. A first period from 1984 to 2000, characterised by good phenological activity, with good vegetation cover, and a second period from 2001 to 2018, marked by a significant decrease in vegetation cover. Spatial analysis of the evolution of vegetation formations reveals a north-south density gradient accompanied by an increase in dense forest and the regression of open savannah.

Date: 2022
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