Dynamique informelle de l'espace urbain et érosion accélérée en milieu tropical humide : le cas de la ville de Yaoundé

Abstract

Schéma Directeur d'menagement et d'urbanisme de 1 9 8 2. 2.-Soci&é Immobilière de Construction.

Hydrochemical Characterisation and Assessment of the Level of Contamination of Groundwater Collected by Private Waterworks in the Town of Moundou in the South of Chad

“…Moundou is one of the cities in Africa south of the Sahara with strong demographic growth, "this acceleration of the population is followed by a dizzying spatial expansion and widespread poverty in and around it" (Djangrang et al, 2011). As a result, "in most cases, the population occupies flood-prone areas and is vulnerable to heavy rains" (Tchotsoua, 2007). Faced with urban growth, the commune is finding it difficult to control the pace of spatial development in the new districts, and water, which is a factor in development and spatial organisation, is becoming a worrying problem for the town's population.…”

Effect of Vegetation Degradation on the Soil Quality of Green Spaces in a Tropical Megacity (Lubumbashi, Dr Congo): Potential Implications for Ecosystem Services

“…When the soil is degraded, its ability to perform its functions decreases, which causes not only a decrease in its own viability but also an increase in the occurrence of extreme natural events (erosion, ooding, landslides) (Roose, Boli, and Rishirumuhirwa, 2015). In several tropical cities, the destruction of soil structure by the loss of vegetation due to the mismanagement of green spaces causes important damage (M. Tchotsoua 1994). For instance, in Yaoundé and Ngaoundéré in Cameroon, the ferralitic soils (Tchotsoua 1994; Tchotsoua and Bonvallot 2001), and in Ivory Coast, tropical soils (Rakotoarimanana et al 2008) of cities are subject to erosion because of the mismanagement of green spaces.…”

“…In several tropical cities, the destruction of soil structure by the loss of vegetation due to the mismanagement of green spaces causes important damage (M. Tchotsoua 1994). For instance, in Yaoundé and Ngaoundéré in Cameroon, the ferralitic soils (Tchotsoua 1994; Tchotsoua and Bonvallot 2001), and in Ivory Coast, tropical soils (Rakotoarimanana et al 2008) of cities are subject to erosion because of the mismanagement of green spaces.…”