Geography- Scholarly Publications

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Browsing Geography- Scholarly Publications by Author "Abiodun, B.J"

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  • Item
    Open Access
    Climate change, Terrestrial ecology imprints and adaptation options in semi-dry environments – a case of the Nigerian savannah
    (ICID+18 2nd International Conference, 2010) Fasona, M.J; Tadross, M; Abiodun, B.J; Omojola, A.S
    Significant climate change expected over the 21st century will affect ecosystems and access to natural resources especially arable lands and water in arid and semi-arid environments. Restored and well managed, but climate-sensitive natural resource systems can become human shock absorbers, targets for climate change mitigation, and fulcrum for adaptation strategies. This study demonstrates how a degree of localised eco-geographical factors, some of which vary by season and areas, control the local climate in the semi-dry wooded savannah of Nigeria. The eco-geographic variables were integrated within a GIS and statistically analysed using principal component analysis (PCA). The result was profiled for association and feedbacks between climate and the eco-geographic variables and to also determine the principal controlling factors of the local climate in both present and future scenario. The results suggest a local climate system driven mainly by the coupling between terrain, rainfall and temperature in all seasons. This climate-orographic complex predominates around the southwest-northwest corridor in all seasons except June-July-August (JJA). The system spatially reverses to the southeast-northeast corridor in JJA, which also coincides with the arrival of the West African monsoon. The southeast-northeast corridor thus receives maximum rainfall. This pattern is projected to continue in future scenario. However, the spatial influence of the climate-orographic complex will diminish around the northwest, while the system will weaken with rainfall becoming less significant in the system in JJA. The pattern of rural settlements and rural landuse suggests that livelihood systems of the local populations are directly connected to the local climate-orographic complex. This eco-climatic asset is also the single source of all major drainage of the entire western Nigeria.
  • Item
    Open Access
    Land Systems response to Water Footprint in the Wooded Savannah of Nigeria
    (Obafemi Awolowo University Press, 2011) Fasona, M.J; Tadross, M; Abiodun, B.J; Omojola, A.S
    Erratic space and time distribution of rainfall coupled with increase in temperature means less water. The water footprint, therefore, will be critical for future development in dry and semi-dry areas where survival for large population depends on rainfed agriculture and the natural resource stock. This study investigates the linkage between water footprint and land system changes. Present and projected future rainfall and temperature data were integrated with local eco-geographical factors and subjected to principal component analysis (PCA) to decipher the present and future pattern of water footprint. These integrated dataset was also analyzed to build change drivers which were applied to satellite image derived land-cover maps to project future land-cover pattern under both present and future climate scenario using Idrisi’s dynamic CA_Markov land change model. The results suggest the emerging and future spatial pattern of ecosystems, agricultural land-use and agrarian settlements will largely follow the water footprint. Under future climate scenario (2046-2065) galleria forest - a signature of the drier savannah - is projected to dominate much of the presently forested landscapes and this will correspondingly shift the water footprint and thus alter the spatial and temporal pattern of agricultural land-use and settlement locations.