School of Environmental Sciences

Permanent URI for this collection

https://repository.futo.edu.ng/handle/20.500.14562/1243

Browse

Browsing School of Environmental Sciences by Subject "Department of Geosciences"

Now showing 1 - 3 of 3
  • Thumbnail Image
    ItemOpen Access
    Application of geographic information system (GIS) in accuracy assessment of existing land use map a case study of Enugu Area, South-Eastern Nigeria
    (Scientific & Academic Publishing, 2012) Onunkwo, A. A.; Nwankwo, G. I.; Uzoije, A. P.; Okereke, C. N.
    It is suspected that continuous building collapses within Enugu area is due to faulty landuse map. This work aims at employing geographic information system principles to assess the validity of the existing landuse map of Enugu area. Three landuse options were considered (Industrial, residential and waste). The study was undertaken using Arc view 3.2a academic, Excel Statistical Software and autocard software of GIS. A total of 12 landuse determinants were selected as thematic data layers and basic factors influencing the choice of industrial, residential and waste disposal landuses. Soil characteristics and geology were integrated into the thematic maps to facilitate the weighting of the basic determinants. The thematic layers were weighted on a scale of 0% - 100% and 0-2 inclusive, using the criteria obtained from field work and laboratory investigation. The thematic layers for each landuse were subjected to overlay using arc view software overlay model builder. The operation yielded three (3) different landuse maps (Industrial, residential and wasted disposal,) which were further superimposed to produce a composite landuse map useful for regional and urban planning. Correlation with existing landuse map, exposed a lot of limitations of the existing landuse map. All the residential and industrial areas of the existing landuse map fall within the low capacity areas of the present study. Areas selected as open space by the existing landuse map correspond to the areas of industrial and residential land uses of the present study. Areas limited for use by the present study due to hazards of flooding, landslide, fault and gully erosion were not considered by the existing landuse map, rather they were mapped out for industrial, residential and partly as open space. The existing landuse map has no provision for waste disposal. The present study shows that areas to the West, Southwest and Southeast are highly suitable for industrial and residential landuses. The limitations of the existing landuse map exposed by the present study must have accounted for the cases of building collapses in the area.
  • Thumbnail Image
    ItemOpen Access
    Application of geographic information system (GIS) in industrial land capability index mapping of a developing country . a case study of Enugu area , South- Eastern Nigeria
    (2011-08-05) Onunkwo, A. A.; Uzoije, A. P.; Onyekuru, S. O.
    It was projected that the population of Enugu area will grow at approximately 300% by the year 2020. The information is further strengthened by the projected 3,237,298 population figure of the area. This implies that there is the expectation of overpopulation of the area in future. Unemployment and lowering of people’s standard of living are always associated with over population. It therefore, becomes necessary to map out areas on a sustainable basis and most suitable for the sighting of industries to employ the teeming population. Land capability index mapping using Geographic Information System (GIS) principles was used for this study. The study was undertaken using Arc View 3.2a academic, Excel statistical soft-ware and auto card software of GIS. A total of 12 land use determinants were selected as thematic data layers and basic factors influencing the choice of industrial land use. Soil characteristics and geology were integrated into the thematic maps to facilitate the weighting of the basic determinants. The thematic layers were weighted on a scale of 0%-100% and 0-2 inclusive, using the criteria obtained from field work and laboratory investigation. The thematic layers were subjected to overlay using arc view soft ware overlay model builder. The operation yielded a layer of preferred industrial land use options in a map form. 3 areas of varying suitabilities (Area 7,8 and 9) resulted from this operation. Area 7 occupies 10% of the study area suitable for industrial land use options; area 8 occupies 70% and has low suitability for industrial land use while area 9 occupies 20% of the land unit unsuitable for industrial land use.
  • Thumbnail Image
    ItemOpen Access
    Comparative analysis of the quality of the shallow and deep aquifer waters of Nsukka se, Nigeria – a preliminary approach to water resource development .
    (Elixir Publishers, 2014) Onunkwo, A, A.; Uzoije, A. P.; Ibeneme, S. I.; Obioha, E. Y.
    Comparative analysis of the shallow and deep aquifers of Nsukka SE, Nigeria was studied as a preliminary approach for the underground water resource development of the region. Method of approach involves the identification of rock formations and delineation of their stratigraphic relationships. Activities involved collection and analysis of water samples from boreholes and hand dug wells. A total of 14 water samples were collected (7 from shallow and deep aquifer each) and analyzed for inorganic and organic components. Ca2+,Na+, Mn2+, Cl-, Pb and Cd were analyzed using Atomic absorption spectroscopy. K+ was determined using flame photometer method. Copper Cu2+ was analyzed using spectrophotometer, pH was analyzed with the aid of pH meter, Fe2+ was determined calorimetrically using Spekker absorption meter; Tds was determined using glass fiber filter. Turbimetric method was used to assess turbidity. Anions like HCO3- were also estimated by titrimetric method. Coliform analysis was carried out by the most probable number technique (MPN). The result shows that average pH for deep and shallow aquifer gives 5.8 and 6.3, sulphate 14.2 and 10.97, Nitrate 2.5 and 2.2., Phosphate 1.48 and 1.68, iron 1.98 and 1.60 magnesium 11.4 and 11.8, Sodium 1.80 and 2.4, Chloride 8.4 and 9, Tds 33.51 and 62.17. The coliform count ranges from 3/100 to 7/100 ml only for shallow aquifer (pollution), magnesium is the major contributors of hardness in both cases. Deep aquifer water plots as magnesium cation and a no dominant anion and on the transition between fresh and salt water (brackish water). The shallow aquifer has magnesium sulphate and plots in the zone of sea water, and shows hard water. The SAR for deep aquifer is 0.58, while that of shallow aquifer is 0.32 both are excellent for irrigation. Both waters are ideal for use in industries and homes, while the aquifers are highly polluted by iron, the shallow aquifer is polluted by water borne diseases. Reference to these information is ideal for the water resource development of the region.