Department of Geography-Journal Articles

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Journal Articles (Geography)

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Browsing Department of Geography-Journal Articles by Author "Eludoyin, Adebayo O"

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    Air temperature, relative humidity, climate regionalization and thermal comfort of Nigeria
    ( International Journal of Climatology, 2014-05) Eludoyin, Oyenike M.; Adelekan, Ibidun O.; Webster, R; Eludoyin, Adebayo O
    Planners and policy makers require information about the regions for which they are responsible. However, it seems that many developing countries, including Nigeria, are not adequately prepared either for their current climates or for the impact of climate change because they lack sufficient information. We have therefore examined the variations in the thermal condition in terms of the temperature, relative humidity, effective temperature (ET), temperature– humidity index (THI) and relative strain index (RSI). We studied the spatial and temporal (1951–2009, 1951 –1980, 1981 –2009, decadal, seasonal and monthly averages) variations in the thermal climate of Nigeria, and we divided Nigeria into thermal climate regions for effective climate change management. Mean annual minimum, mean and maximum temperatures (with their standard deviations) were 21.4 (3.5), 27.1 (2.7) and 32.8 (3.4) ◦C, respectively, while the overall mean relative humidity was 62 (24.8)%. Mean ET, THI and RSI were 24.3 (0.85), 24.8 (1.83) and 0.2 (0.18) ◦C, respectively. The ET, THI and RSI provided contrasting expressions of thermal comfort for Nigeria, because of its varied climate. We also found that elevation; the movement of the Inter Tropical Discontinuity and urbanization affect thermal comfort in Nigeria. We conclude that thermal stress has increased in Nigeria from 2000 at most stations, especially in the south and north-western regions, and that Nigerian thermal comfort climate is heterogeneous and requires analysis of multiple thermal indices
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    Air temperature, relative humidity, climate regionalization and thermal comfort of Nigeria
    (Wiley Online Library, 2014-05) Eludoyin, Oyenike M.; Adelekan, Ibidun O.; Webster, R; Eludoyin, Adebayo O
    Planners and policy makers require information about the regions for which they are responsible. However, it seems that many developing countries, including Nigeria, are not adequately prepared either for their current climates or for the impact of climate change because they lack sufficient information. We have therefore examined the variations in the thermal condition in terms of the temperature, relative humidity, effective temperature (ET), temperature–humidity index (THI) and relative strain index (RSI). We studied the spatial and temporal (1951–2009, 1951–1980, 1981–2009, decadal, seasonal and monthly averages) variations in the thermal climate of Nigeria, and we divided Nigeria into thermal climate regions for effective climate change management. Mean annual minimum, mean and maximum temperatures (with their standard deviations) were 21.4 (3.5), 27.1 (2.7) and 32.8 (3.4) ◦C, respectively, while the overall mean relative humidity was 62 (24.8)%. Mean ET, THI and RSI were 24.3 (0.85), 24.8 (1.83) and 0.2 (0.18) ◦C, respectively. The ET, THI and RSI provided contrasting expressions of thermal comfort for Nigeria, because of its varied climate. We also found that elevation; the movement of the Inter Tropical Discontinuity and urbanization affect thermal comfort in Nigeria. We conclude that thermal stress has increased in Nigeria from 2000 at most stations, especially in the south and north-western regions, and that Nigerian thermal comfort climate is heterogeneous and requires analysis of multiple thermal indices.
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    Land cover change and forest management strategies in Ife nature reserve, Nigeria
    (GeoJournal, 2018-09) Eludoyin, Adebayo O; Iyanda, Olamide Olaleye
    This study examined the existing forest management strategies and land cover change in one of nature forest reserves in Nigeria. It analysed freely available Landsat imageries for the assessment of land cover change between 1986 and 2014, and conducted key informant interviews on forest guards and an administrator in relevant ministry, for information on management practiced. Results showed that about 35.2% of the vegetal cover were lost within the study period; 80% of the interviewed forest guards attributed such loss to unrestricted access of the surrounding communities, 60% to logging or chain saw operation, and 40% to farming practices and bush burning in the reserve. Management practiced is that, which ensures passive input with active harvesting, but cannot be fixed within a specific sustainable strategy of the Food and Agriculture Organisation of the United Nations. The study concluded that given the management strategy practiced in the forest reserve, which also allows defaulters of forest reserve regulations to escape punishment because they can ‘settle’, indicate that corruption, rather than poverty, is the major drive of deforestation in the area.
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    A multi-perspective view of the effects of a pipeline explosion in Nigeria
    (International Journal of Disaster Risk Reduction, 2013-11) Makinde, E. O.; Eludoyin, Adebayo O; Salami, Ayobami T
    Vandalisation of petroleum pipelines is a major cause of pipeline fire disasters. However, except the number of deaths recorded, little information of the effects of such disasters on the environment is often reported in developing countries, and post-disaster remediation process is thus usually unmonitored or ineffective. This study investigated the effect of a major pipeline disaster in a rural environment in Nigeria from multi-date satellite imageries (orthophoto map, Landsat Enhanced Thematic Mapper Plus, ETM þand IKONOS), social and ecological surveys. Results showed that some of the affected settlements were within the pipeline corridor before the disaster, and pipeline vandalisa- tion was encouraged by one or more cases of faulty and exposed pipeline, deficient pipeline monitoring system, sabotage and readily available markets for siphoned oil. Ecological effects include loss of about 200 ha of vegetation resulting into significantly lower woody and herbaceous plant species in the affected regions than the adjacent plots. Significant proportion of the survivors also reported lower quality of groundwater (well water), air and streams, health problems (mainly abdominal pain) after they drank the well water and destruction of their crops and farmlands. The study concluded on the need for enforcement of the right-of-way laws on pipelines in Nigeria.
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    A multi-sensor-based evaluation of the morphometric characteristics of Opa river basin in Southwest Nigeria
    (trading as Taylor & Francis Group, 2019-11) Adewole, Adedayo Oreoluwa; Felix, Ike; Eludoyin, Adebayo O
    Studies have shown that many river basins in the sub-Saharan Africa are largely unmonitored, partly because they are poorly or totally ungauged. In this study, remote sensing products (Landsat, Advanced Spaceborne Thermal Emission and Reflection Radiometer; ASTER and Shuttle Radar Topography Mission; SRTM) that are freely availableintheregionwereharnessedforthemonitoringofOpariver basin in southwestern Nigeria. The remote sensing products were complementarily used with topographical sheets (1:50,000), ground based observation and global positioning systems to determine selected morphometric characteristics as well as changes in landuse/ landcoveranditsimpactonpeakrunoff intheOpariverbasin.Results showed that the basin is a 5th order basin whose land area has been subjected to different natural and anthropogenic influences within the study period. Urbanisation is a major factor that threatens the basin with degradation and observed changes, and the threats are expectedtobecomeworseifrestorationisnotconsideredfromsome tributaries. The study concluded that commentary use of available remotesensingproductsintheregionwillprovideanimportantlevel of decision support information for management and monitoring of river basins.
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    A remote sensing-based evaluation of an ungauged drainage basin in Southwestern Nigeria
    (Taylor & Francis, 2019-07) Adewole, Adedayo Oreoluwa; Eludoyin, Adebayo O
    Paucity of scientific information about many river basins in developing countries, especially in subSaharan Africa, has been linked to poor datasets and expensive monitoring technology. This study assessed the capability of freely available Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Shuttle Radar Topography Mission (SRTM) Digital Elevation Models (DEMs) and Landsat imageries to provide management decision support on river basins in the region. Main objectives are to examine landuse/landcover change over the Opa river basin in Ife area in southwest Nigeria, characterize the basin morphometrically and compare the morphometric characteristics from different sensors and resolutions. Results showed that the ecosystem of the river basin is vulnerable to urban intrusion and disturbance from human activities as urban population increases. Also, analysis of the DEMs allowed the drainage basin to be delineated into relatively homogenous and manageable sizes that can ease management, organization and evaluation of their eco-hydrological systems. The study concluded that complementary use of SRTM and ASTER DEMs with Landsat imageries that are freely available spatial data for researchers, is capable of providing useful decision support system for management of river basins in the region, to a level of uncertainty occasioned by sensors’ characteristics.