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C.T. Koulibaly, J.O. Ayoade
classification algorithms or supervised classification algorithms functions were used
to create a binary image that separate water bodies to land surrounding. This calcu‑
lation was also done using our 10 years interval analysis: 1978 to 1988, 1988 to 1998,
1998 to 2008, and 2008 to 2018. The 2 binary images of each of these 2 dates were then
overlaid one on top the other, from the most recent to the oldest for erosion detection
and from the oldest to the youngest for accretion detection.
3. Results
The results emanating from the analysis of shoreline changes show that the
coastline has been unstable over the considered period (1978–2008). Both erosion
and accretion phenomenon were noticed along the coastline but were strongly vari‑
able according to time and space.
3.1. Shoreline Change Rate
Shoreline Change Rate from 1978 to 1988 (Figs. 5, 6)
Between 1978 and 1988, the analysis illustrated by Figure 5 reveals the shore‑
line is strongly affected with a retreat ranging from −1 to −19.48 from Rufisque to
Toubab Dialaw.
Fig. 5. Shoreline change rate from 1978 to 1988