Browsing by Author "Dami, A."

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    Analysis of the Relationship between Wildfire Occurrences and Population Trend within the Shores of Lake Chad Basin Using Geoinformation
    (Department of Geography, Nasarawa State University Keffi, 2012-03-01) Dami, A.; Ayuba, H.K.; Bila, M.
    The study focuses and examines the relationship that exists between wildfire occurrence and the population trend within the shore of the Lake Chad. Geospatial analysis of fire pixel counts from MODIS images of the period 2001 – 2009 was performed to determine the relationship between the wildfire occurrences and the population trend. The interpretation of SPOT panchromatic imagery in combination with field survey provided perimeters of settlements and estimated population in the area with the highest fire density in the north basin of Lake Chad. Major findings shows that the distribution of wildfires on the floor of Lake Chad for the period 2001-2009 reflected a spatial relationship with the distribution of vegetation and a temporal relationship with the seasonality of human-ecosystem interactions. The total number of fires recorded on the Lake floor is 25,690 leading to a burnt area of 19,274 km2. The population trend however, is increasing while that of wildfire occurrences is decreasing. The increasing trend in population against a decreasing trend in wildfire occurrences is an indication of the gradual conversion of the wild habitat between the old and the new shorelines of Lake Chad through human-ecosystem interactions from wild land to human occupation and exploitation.
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    Analysis of Wildfire Occurrences within the Shores of Lake Chad using Geo-information Technology
    (Department of Geography, Nasarawa State University Keffi, 2011-11-01) Ayuba, H.K.; Dami, A.; Mohammed, Bila D.
    Geographic Information Technology provides an important tool in modeling ecosystem dynamics. One of the drivers of ecosystem change in the Lake Chad Basin is wildfire. This paper examines the historical spatial patterns of wildfires and employed a trend analysis using Geographic Information System (GIS) technique in analyzing fire pixel counts from MODIS images of the period 2001-2009. The results revealed a declining trend in wildfire occurrences and a non-linear relationship in the numbers of wildfire occurrences for the period 2001-2009. This is due to the interplay of several factors such as human influence, winds, temperature changes, and the type, extent and spread of vegetation. During the period under study, the total number of fires recorded in the Lake floor is 25,690 with a burnt area of 19,274 km2 The highest number of fires occurred in 2001, with varying figures in subsequent years. The highest number of fires in 2001 may be connected to the extent of flooding and the subsequent invasion by vegetable biomass on the Lake floor after the recession of floods. The decline in wildfires is indicative of the fact that the biomass within the lake floor, which would ordinarily have been burnt, is now being cleared to make way for farmlands. The declining trend in wildfires on the lake floor of the Lake Chad Basin is seen as a good development for the basin.
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    Ground water pollution in Okpai and Beneku, Ndokwaeast local government area, delta state, Nigeria
    (Department of Geography, Nasarawa State University Keffi, 2013-02-21) Dami, A.; Ayuba, H.K.; Amukali, O.
    This study has assessed the probable contamination of ground water resources in Okpai and Beneku area of Delta State, Nigeria. The ground water samples were collected in the dry season (December, January and February) and wet season (June, July and August) seasons from Okpai (experimental site) and Beneku (control site). The water samples were analyzed for Physico -Chemical and biological parameters using standard procedures. The results show that both Okpai and Beneku ground water contained high amounts of magnesium (1.173mg/l in the dry season and 1.277mg/l in the wet season) and iron (0.036mg/l in the dry and 0.021mg/l in the wet) for the former while cadmium (0.002mg/l in the dry and 0.005mg/l in the wet), iron (0.676mg/l in the dry and 1.062mg/l in the wet), magnesium (1.21mg/l in the dry and 1.437mg/l in the wet) and lead (0.004mg/l in the dry and 0.005mg/l in the wet) for the latter. Apart from these specific cases, other values corresponded to the approved maximum permissible level (i.e. maximum permissible limits for drinking water set by NAFDAC, USEPA and WHO). The ground waters therefore, were more impacted upon by chemical parameters, than physical and biological parameters. In conclusion, this study recommends for the Bio- Physico-Chemical assessment extension to other new areas of the Niger Delta region of Nigeria.
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    Physico-Chemical and Bacterialogical Analysis of the Surface Water Used for Domestic Purposes in Okpai and Beneku, Delta State, Nigeria
    (Department of Geography, Nasarawa State University Keffi, 2012-01-01) Dami, A.; Ayuba, H.K.; Amukali, O.
    The main focus of this study is to analyze the effects of gas flaring and oil spillage on surface water used for domestic purpose in Okpai and Beneku area, Delta State Nigeria. Surface water samples were collected in the dry (December, January and February) and wet (June, July and August) seasons from Okpai (experimental site) and Beneku (control site). The water samples were analyzed for chemical, physical and biological parameters using standard procedures. The results for all the parameters analyzed showed higher variation between samples obtained from the experimental site and those of the control site which indicate possible pollution in the experimental site for instance, the pH values were 5.33 and 5.586 in the dry and wet seasons respectively for Okpa. For Beneku, the pH values were 6.82 and 6.91 in the dry and wet seasons respectively. Magnesium (2.437mg/l in the dry and 2.063mg/l in the wet recorded in samples obtained from Okpai were higher than those obtained Beneku. The presence of coliform (<2 colonies in the dry and approximately <1.67 colonies in the wet were recorded in Okpai samples.