The urban areas of the N’zo watershed, in western Côte d’Ivoire, face recurring floods that exacerbate the vulnerability of the households exposed to them. The objective of this study is therefore to analyze the hydro-pluviometric dynamics in this basin in order to understand the recurrence of flooding in the urban areas of Man, Guiglo, and Bangolo. The study of hydro-pluviometric characteristics is therefore essential to understandingthe origins of this hydrological risk in these urban areas. To this end, statistical analyses have highlighted changes in precipitation as well as in the hydrological regime. Concurrently, the use of geographic information systems (GIS) has enabled the identification and spatialization of areas exposed to flooding. The results reveal annual and seasonal fluctuations in precipitation and runoff, with a high concentration during the period from July to October. This period is there fore particularly prone to the occurrence of high water levels and flooding. Furthermore, the study reveals that 28.67% of the urban area of Man is at risk of flooding. In Guiglo and Bangolo, the areas exposed to this natural hazard account for 49.88% and 36.63% of these urban areas, respectively. In this context, urban populations are exposed to this hydrological risk and are becoming increasingly vulnerable due to its recurrence.

The rapid expansion of cashew orchards in the Diabo, Botro and Bodokro sub-prefectures in central Côte d'Ivoire is putting great pressure on vegetal cover. This situation has encountered the sustainability of farms. Thus, the objective of this research is to map the levels of vulnerability of land use units facing the spatial progression of cashew orchards in these spaces. The intention is to raise awareness among local populations and to draw the attention of decision-makers to the real threats of food insecurity and loss of forest cover in these areas. The method used comes down to spatial modeling on Arc-gis from the 2002 and 2017 land cover maps of the study area. The results show a high concentration of land use units likely to be colonized by cashew orchards near the localities. In addition, fallows are extremely vulnerable to the expansion of cashew orchards with 15,892 ha likely to be invaded by cashew trees within a 1 km radius, followed by shrub savannas with 15338 ha.