Papers by Chukwubueze Onwuzuligbo
Earth science Malaysia, Dec 31, 2022
In recent decades, urban sprawl has been viewed as one of the most pressing issues that cities ov... more In recent decades, urban sprawl has been viewed as one of the most pressing issues that cities over all the world in developing countries are batting with. It is often associated mostly with rural-urban migration and rising birth rates, where development is given precedence over urban planning. The study focuses on the urban sprawl of the greater Port Harcourt city. The greater Port Harcourt city is expanding at an unprecedented rate, with no adequate planning or statistical record. The study intends to address this issue by building models using remote sensing and geographic information system (GIS) tools in order to analyze urban sprawl in the Greater Port Harcourt city. To achieve this set of objectives, three sets of Landsat sensors, which were captured at different time intervals (1986, 2006, and 2021), were used to monitor urban sprawl in the study area. The Geographic Positioning System (GPS) was used during the field visit to collect the ground control points of some locations within the city. The National Population Commission (NPC) data was also employed to acquire the demographic statistics. The result of the study shows that the built-up area had expanded from 47.35 km 2 (10.76%) in 1986 to 71.05 km 2 (16.14%) in 2000 and to 284.68 km 2 (64.68%) in 2021. This expansion in built-up area generates a decline in wetland, bare land, and forest land from 112.296 km 2 (25.51%), 61.369 km 2 (13.94%), and 160.152 km 2 (36.39%) in 1986 to 72.468 km 2 (16.47%), 86.486 km 2 (19.65%), and 136.853 km 2 (31.09%) in 2000, and to 42.810 km 2 (9.73%), 10.858 km 2 (13.94%), and 40.8384 km 2 (9.28%) in 2021. The findings of the study are important because they give the government information on how quickly the study area is expanding, allowing it to adopt an appropriate planning strategy. In conclusion, the study demonstrate that remote sensing and GIS techniques can be utilized to successfully monitor the environment on a regular basis in order to investigate urban sprawl and inform better decisionmaking.
European Journal of Environment and Earth Sciences
Ambient air pollution is widely acknowledged to be the worst type of environmental pollution. The... more Ambient air pollution is widely acknowledged to be the worst type of environmental pollution. The amount of air pollution varies from time to time and from region to region. The spatiotemporal distribution of air pollutants in the city of Enugu was investigated in this study. Due to the high concentration of industrial clusters, heavy traffic and increasing population density in the study area, notable places were purposely sampled during the hours of 8a.m. and 4p.m. A portable gas analyzer, the Aerocet-531 Met One Instrument, Drager X-am 5000, was used to quantify the amounts of PM2.5, PM10, CO, SO2, and NO2. The GPS coordinates of the sampling spots were recorded using the portable Germin-300 Global Positioning System (GPS) device analyzer, which aided in the data processing to create spatial interpolation maps in ArcMap. GIS and remote sensing methods were utilized to analyze the spatial distribution of contaminants using satellite images. ArcGIS and Erdas Imagine were used to an...
This study examines the effects of sewage disposal systems on the environment in Riverside housin... more This study examines the effects of sewage disposal systems on the environment in Riverside housing estate in Enugu metropolis. The research method adopted for this study was survey method; the two estates were visited to examine the disposal methods to know the method that has negative impacts on the environment. The systems common in the estates are On-site system and Centralized system. The onsite system is gaining more importance in the estates as different from the centralized system which was initially planned in the estate. However, the systems are not without challenges resulting from choice of inapt skill, improper siting, non- adherence to proper design concepts and lack of proper maintenance. These bring about negative environmental impacts ranging from ground water contamination, pollution of surface water bodies to contribution to global warming through the emission of green house gases. From the survey, it was observed that the only problem with on-site system is the c...
Tropical Built Environment Journal, Oct 7, 2016
Journal of environment and earth science, 2014
Topographic maps are needed almost in every aspect of public and private sector activities, inclu... more Topographic maps are needed almost in every aspect of public and private sector activities, including general engineering and construction works, economic and physical planning regulation, environmental management, general planning and as a base map for land use/land cover mapping. Most of the topographic maps available in Nigeria are outdated including that of Onitsha and its environs. Consequently, they cannot be used for the desired needs. This study focused on the use of Remote Sensing and Geographic Information System (GIS) in revising and analyzing 1:50000 topographic map of Onitsha metropolis. Two satellite images (Landsat-7 ETM+ and NigeriaSat-1) of the same date (2006) were used respectively to revise 1964 topographic map of Onitsha metropolis. The two imageries which have been georeferenced, in UTM Coordinate System of WGS 84 Zone 32 were sub mapped using the bounding coordinate of the study area. The NigeriaSat-1 and the digitized and georeferenced topographic map of the ...
ASEC 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
The importance of geodetic controls to Geodesy, Surveying, Mapping and Engineering cannot be over... more The importance of geodetic controls to Geodesy, Surveying, Mapping and Engineering cannot be over emphasized. Amongst other functions, controls help in the maintenance of uniform coordinates within the country. Ono et. al.(2013) showed that the greatest challenge to the existence and sustainability of these controls in Nigeria is that these controls are destroyed during engineering works like buildings, road construction and other infrastructural developments. It therefore behoves on the Geodesists to seek out areas that pose minimal challenges to these controls. The Right of Way of the high tension power lines appear promising in this regards. Being maintained by the Federal Ministry of Power, Works and Housing, and free from major constructions, it appeared as a safe haven for geodetic controls. However, the effect of the electromagnetic waves from the current bearing power lines on survey techniques and instruments, especially GNSS Signals needs to be assessed and modelled before this "safe haven" is to be explored. To analyse the effect of the power line on GNSS signals, the Magellan Promark 3 GPS was used in both Stop-and-go and Static Post Processing methods on a set of points established using Kolida L420 both under and off the high tension poweline. The two results from the GPS observation were compared against the coordinates of the controls. The Root Mean Square Errors of the Stop-and-Go was 7.607mE and 0.534mN while that of the Static Post Processing are 0.0013mE and 0.0014mN. It was recommended that the option of establishing controls under High Tension Power Line be explored. It was further recommended that caution should be taken to abide by the 90minutes duration stipulated in the Surcon Specification for Geodetic Surveys for Static Post Processing under High Tension Power Line.
Earthquakes and Tremors are Tectonic activities traced to Crustal Motions with roots in the Conti... more Earthquakes and Tremors are Tectonic activities traced to Crustal Motions with roots in the Continental Drift Theory. These activities occur mostly at Plate Boundaries and along or close to Fault Lines. Nigeria was erroneously considered aseismic in the past, but studies have shown that Nigeria was never aseismic as information on different Tremors and Earthquakes abound. The recent occurrences of Tremors in Abuja, the Nation's Capital, call for a serious attention towards the definition of the Nigerian Fault Lines. An attempt towards the determination of the Fault Lines is made, using the Non-Geodetic and Geodetic Methods. The Non-Geodetic Method Seeks to connect the Epicenters of different Earthquakes and Tremors on record, in order to present a possible set of Fault Lines.
Journal of Environment and Earth Science, 2014
This research focuses on the environmental sensitivity index mapping and assessment of gully eros... more This research focuses on the environmental sensitivity index mapping and assessment of gully erosion sites in Anambra State. It was motivated by the increasing destruction of lives and properties in Anambra State through gully erosion menace and the need to identify the geographical locations and magnitude of these sites in addition to factors responsible with a view to proffer solutions. It pursues map production as a way to visually display the locations of these gully sites. Gully sites in Anambra States were identified through literature and field investigations. Geographic positioning system (GPS map 78) equipment was employed to obtain the coordinates of the sites. Digital camera was used to take photographs of identified sites. Factors responsible for the gully formations were obtained through literature and field investigations. The coordinates of the gully sites were plotted on the geo-referenced map of Anambra State to indicate the geographic locations of the sites. The gully sites were categorized into four using: (i) depth of the gully site, (ii) length of the gully, and (iii) level of destruction of lives and properties so far, as criteria. Results obtained showed that there are 166 gully sites in Anambra State, categorized into (i) Most severely, (ii) severely, (iii) moderately, and (iv) slightly gully sites. It identified both natural and anthropogenic factors such as nature of the landscape, soil, rocks and surface water; demographic factors, bad control measures and poor appreciation of erosion problems among others as being responsible for gully erosion menace in Anambra State. The research recommends tree planting campaigns, control of soil and sheet erosion early enough, development control measures and environmental education among others as solutions to gully erosion problems in the State.
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Papers by Chukwubueze Onwuzuligbo