Geography- Scholarly Publications

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Browsing Geography- Scholarly Publications by Author "Abbas, I.I"

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  • Item
    Open Access
    Geographic Information for Disaster Management in Nigeria: Case Study of the Mud-beach Coast of Southwestern Nigeria
    (University of Lagos, 2014) Fasona, M.J; Omojola, A.S; Soneye, A.S.O; Akintuyi, A.O; Abbas, I.I
    This paper demonstrates the importance of geographic information in disaster management. It examines the state of disaster management in Nigeria and presents a local area case study of the use of geographic information to establish the vulnerability to composite environmental threat and hazard of 605 communities around the Mud-beach coast of southwestern Nigeria. Environmental threat and hazard factors interpreted from remote sensing imageries were integrated within geographic information systems with data that characterized the communities. The integrated data was further analyzed for indices of exposure (stressors which define damage potentials) and management (likely coping ability which defines severity) for each community. Vulnerability index for each community was evaluated by comparing the difference between the degree of exposure and management. In terms of exposure, the results suggest that 18 communities fall under high exposure, 129 under medium exposure and 458 under low exposure categories. For management, 41 communities fall under the high management-low severity, 131 under average management-average severity and 433 under the low management-high severity categories. In all, 70 communities most of which are first-line settlements are highly vulnerability to composite environmental hazard. 80% of the highly vulnerable communities are found around degraded ecosystems including permanently inundated lands and areas where active devegetation is being experienced which confirms the connection between creeping environmental change process and vulnerability to disasters especially at local levels.
  • Item
    Open Access
    Outlook of Land-change projection in the wooed savannah under present day and future climate scenarios using the CA-Markov Model
    (Department of Geography, University of Lagos, 2015) Fasona, M.J; Soneye, A.S.O; Ogunkunle, O.J; Adeaga, O.A; Fashae, O.A; Abbas, I.I
    Understanding the feedback between climate and land-cover is important for planning climate mitigation and adaptation measures at local scales. This study presents evidence that climate change has the potential to influence land-cover patterns over space and time and land change models can compliment climate models to provide better understanding of the climate and land-cover relations at local levels. Present day (1982-2006) and downscaled future(2046-2065) rainfall and temperature data were integrated with local eco-geographical factorsto build change suitabilities for land-cover change for present day and future climate scenarios. The basis land-cover maps were derived from Landsat imageries. The change suitabilities werecombined with markov probabilities and applied to the basis land-cover to predict future land-cover maps under the present day and future climate scenariosusing Idrisi’s Cellular Automata-Markov land change model. The results suggest that forest and woodland which are the major canopy ecosystems are expected to remain relatively stable both in areal coverage and spatial pattern under the present day climate scenario. In the future climate scenario, the areal coverage of the canopy ecosystems is expected to be relatively stable, but dramatic change in the spatial pattern is likely as the wooded savanna becomes drier. The forests would likely become more disturbed, with galleria forest becoming the most significant forest type. Shrub/grassland is also projected to become much more widespread. This scenario is expected to alter the spatial pattern of emerging built up and agricultural land-uses