Effects of climate variability and uncontrolled urbanization on the spatial dynamics of lakes in the niayes area of senegal: case of thiourour, warouwaye, wouye and mbeubeuss lakes

Abstract

The purpose of this contribution is to study the dynamics of coastal lakes on the Great Coast of Senegal in a context of climate variability and change, as in the case of Thiourour Warouwaye, Wouye and Mbeubeuss. Diachronic mapping using aerial photographs and satellite images (Landsat and Google Earth Pro images) has made it possible to assess the extent and nature of land cover changes over four dates (1989, 1999, 2009 and 2019). The results show, over the first sequence of observations (1988 and 1999), a tendency for water bodies to decline by less than 26.7 ha for Thiourour Warouwaye and Wouye lakes, unlike Mbeubeuss lake, where the water body has increased by 47.9 ha. On the second sequence of observations (1999 and 2019), an extension is noted on the building and water bodies that increased from 41.6 ha to 51.4 ha on the different lakes (only the water body of Lake Wourouwaye has regressed). Lake systems therefore regenerate after a regressive trend observed in the first sequence in a highly anthropized environment today, thus reducing their ability to perform their ecosystem functions..

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