N N (Publications)
Publisher NIL
Publication Type Conference
Publication Title Investigations Into The Tectonic Lineaments And Thermal Structure Of Lake Magadi Area, Southern Kenya Rift Using Integrated Geophysical Methods”
Publication Authors Komolafe, A.A.
Year Published 2010
Abstract

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Publisher NIL
Publication Type Disertations
Publication Title Volumetric Estimation Of Hydrocarbon Reserves
Publication Authors Komolafe, A.A
Year Published 2003
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Integrated Remote Sensing And Geophysical Investigations Of The Geodynamic Activities At Lake Magadi, Southern Kenyan Rift,
Publication Authors Komolafe, A.A., Kuria, Z.N., Woldai, T., Noomen, M., and Anifowose, A.Y.B
Year Published 2012
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Investigations Into The Tectonic Faults On Magadi Geothermal Field Using Ground And Aeromagnetic Data
Publication Authors ii. Komolafe, A.A., Kuria, Z.N., Woldai, T., Noomen, M., and Anifowose, A.Y.B
Year Published 2013
Abstract

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Publisher NIL
Publication Type Books
Publication Title The Role Of Groundwater Vulnerability In Urban Development Planning. Book Of Readings,
Publication Authors J. O. Owoseni and A. A. Komolafe,
Year Published 2013
Abstract

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Publisher NIL
Publication Type Conference
Publication Title Integration Of Aeromagnetic And Landsat Data For Groundwater Potential Evaluation
Publication Authors Faruwa, R. A., Amigun, J. O., Komolafe, A. A.,
Year Published 2013
Abstract

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Publisher NIL
Publication Type Conference
Publication Title Integration Of Aeromagnetic And Landsat Data For Groundwater Potential Evaluation
Publication Authors Faruwa, R. A., Amigun, J. O., Komolafe, A. A.,
Year Published 2013
Abstract

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Publisher NIL
Publication Type Conference
Publication Title Groundwater Vulnerability Assessment Using DRASTIC Model In A GIS Environment In Akure
Publication Authors Joshua O. Owoseni, Y.A. Asiwaju-Bello and A. A. Komolafe,
Year Published 2012
Abstract

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Publisher NIL
Publication Type Conference
Publication Title A Study Of The Geothermal Potentials Of Lake Magadi Graben, Southern Kenyan Rift, Using Integrated Remote Sensing And Geophysical Methods
Publication Authors Komolafe A. A., Kuria Z. N., Anifowose A. Y. B., Woldai T., Noomen M.
Year Published 2012
Abstract

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Publisher NIL
Publication Type Conference
Publication Title Hydrocarbon Reservoir Characterization Of “Keke” Field
Publication Authors Edigbue P.I; Itamuko O.J ; Adesida A.A and Komolafe, A.A
Year Published 2012
Abstract

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Publisher Natural Hazards Review, American Society Of Civil Engineers.
Publication Type Journal
Publication Title Methodology To Assess Potential Flood Damages In Urban Areas Under The Influence Of Climate Change
Publication Authors Akinola Adesuji Komolafe, Srikantha Herath, and Ram Avtar
Year Published 2018
Abstract
Frequencies of extreme precipitation are likely to increase under changing climate, which may result in more damage to exposed
properties in the future. This study presents a methodological framework for estimating potential economic damages to flood hazards
based on current and future climatic information using loss functions. Loss functions for Sri Lanka’s residential structure categories were
derived from empirical data through a questionnaire survey in Kelani River basin, Sri Lanka. Flood prediction was done using a bias-corrected
5-year time series of the Japanese Meteorological Research Institute (MRI)’s Regional Climate Model (RCM) precipitation data for current
(1985–1989) and near future climate (2028–2032), and a hypothetical future climate projection using a 10% increase in current high rainfall
events. The authors simulated extreme river discharges and inundation depths for potential current and future flood events using similar
hydrologic element response (SHER) and geographic information system (GIS) grid-based models, respectively. Simulated extreme flood
hazards were integrated with the established loss functions and exposures to simulate the potential damages using a raster-based spatial
model. Results revealed a little reduction in the MRI projected near future discharges and flood damages, but an increase in the frequency
of flood events compared to the current projection. However, the hypothetical projection showed a 10.2% increase in potential damages in the
future climate compared with the current climate. Future adaptation measures in the river basin are suggested

Publisher Applied Geomatics, Springer
Publication Type Journal
Publication Title Development Of Generalized Loss Functions For Rapid Estimation Of Flood Damages: A Case Study In Kelani River Basin, Sri Lanka
Publication Authors Akinola Adesuji Komolafe; Srikantha Herath Ram Avtar
Year Published 2017
Abstract

Assessment of infrastructural vulnerability to natural hazards, and subsequent economic loss, can make important contributions to future disaster risk minimization. The recent endeavor is to ascertain and evaluate risk globally, which can provide a framework to identify unique regional vulnerabilities, the mobilization of international investments, and cross-country risk comparison. This would require a concerted effort for the detailed classification of building exposures and vulnerability models. This study presents the design and efficacy of flood-vulnerability models for structural building types. The study uses an empirical approach, with data gathered from survey questionnaire, for direct estimation of flood damages in the Kelani River basin in Sri Lanka. Survey questionnaires were administered in the flood-prone areas of the basin, and depth-damage functions were established for four (4) structural building types that were identified based on the relationship between inundation depths and flood damage ratio. Event-based flood hazards were simulated using the Flo-2D model. Building exposures and densities were derived from remote sensing data, using integrated thematic land cover feature indices and supervised image classification. A modified mathematical loss model was employed to simulate flood damages to each building category for a disastrous flood event in the Kelani River basin. Simulated damages and post-flood survey showed reasonable comparativeness. The models can be employed for loss estimation of future damages and risk-reduction planning for flood disaster in Sri Lanka.


Publisher Applied Spatial Analysis, Springer Science+Business
Publication Type Journal
Publication Title Spatial Distribution Of Malnutrition Among Children Under Five In Nigeria: A Bayesian Quantile Regression Approach
Publication Authors Ezra Gayawan,Samson B. Adebayo, Akinola A. Komolafe, Abayomi A. Akomolafe
Year Published 2017
Abstract
Abstract Issues of malnutrition among young children in developing countries are
gaining more attention of policy-makers because of the adverse effects on the wellbeing
of people and economic of these nations. Anthropometric variables used for
determining malnutrition are measured through z-scores where those whose measures
fall into the extreme ends of the scores are considered malnourished. Conditional mean
regression has been adopted to examine the determinants but often times, covariates
would have effect on the mean, but have no substantial influence on more extreme
quantiles. We adopt Bayesian quantile regression approach to measure the spatial
distributions of childhood undernutrition at state and local government levels in
Nigeria. Markov random fields and Bayesian P-splines were used as priors for the
spatial and nonlinear components respectively and estimation was through MCMC
technique. Results show the existence of north-south divide in undernutrition in Nigeria
and that observed socioeconomic variables could have little influence on the distribution
of undernutrition across space in the country.


Publisher Journal Of Flood Risk Management, John Wiley & Sons
Publication Type Journal
Publication Title Sensitivity Of Flood Damage Estimation To Spatial Resolution
Publication Authors A.A. Komolafe, S. Herath and R. Avtar
Year Published 2018
Abstract
Flood damage estimation is an important element in flood risk assessment; it is
useful for mobilizing investment and developing policies for flood loss prevention
since most flood risk reduction measures are based on cost benefit analysis.
From a global or regional view-point, it is necessary to understand relative
impacts on economies of countries to mobilize international support and
develop response strategies. This requires a unified approach to flood damage
estimation across countries and over large spatial extents. Spatial resolutions
used in the assessment have a direct impact on the estimation of potential flood
heights as well as representation of property exposure and, consequently, the
flood damage estimates.Using Ichinomiya river basin, Japan, as a case study, the
sensitivity of spatial scale in estimating potential flood economic damages is
investigated and approaches are delineated to reduce errors arising from coarse
spatial resolutions.

Publisher American Journal Of Space Science, Science Publications
Publication Type Journal
Publication Title An Integrated Approach To Modelling Of Flood Hazards In The Rapidly Growing City Of Osogbo, Osun State, Nigeria
Publication Authors Suleiman Abdul-Azeez Adegboyega, Oluchi Christiana Onuoha, Komolafe Akinola Adesuji, Ayo Emmanuel Olajuyigbe, Adebola Abiodun Olufemi and Matthew Olomolatan Ibitoye
Year Published 2018
Abstract
In recent times, the swift and uncoordinated urban expansion in
the medium sized city of Osogbo has increasingly encroached on the
environmental sensitive areas. This uncoordinated exploitation of the
ecological fragile areas for urban development has triggered urban
flooding, which poses serious threat to human lives and properties in the
city. This study therefore utilized geospatial technologies to generate flood
hazard model for medium sized cities in developing countries in general
and Nigeria in particular with a view to identifying hotspots and providing
measures to forestall flood occurrences. The study used Shuttle Radar
Topography Mission-Digital Elevation Model (SRTM-DEM), Landsat 7-
2000 and Operational Land Imager 8 (OLI)- 2015 images. Multi-criteria
evaluation method was used to derive the physical characteristics of
watersheds from the data to delineate the areas vulnerable to flooding.
Flood inundation characteristics were simulated using Hydrologic
Engineering Centre-River Analysis System (HEC-RAS) model with GIS
interface and found discharge of over 500 m3/s for the 100-year profile
period to be high, given the size of the analyzed basin (207.41 km2). The
flood hazard map showed that 3.92, 103.38 and 100.11 km2 were least,
moderately and highly vulnerable areas respectively. Most prone areas were
built-ups with high impervious surface in the basin area where floodplain
traversed high and moderate vulnerability zones. The study advocates
consistent use of dynamic model within GIS for floodplain delineation and
management planning to reduce the flood hazards.

Publisher American Journal Of Environmental Sciences, Science Publications
Publication Type Journal
Publication Title A Review Of Flood Risk Analysis In Nigeria
Publication Authors Akinola Adesuji Komolafe, Suleiman Abdul-Azeez Adegboyega and Francis Omowonuola Akinluyi
Year Published 2015
Abstract
Nigeria has witnessed diverse flood events in the past years
and due to the high level of vulnerability and lack of coping capacity of
the people, with the fast occurrence of extreme events resulting from
climate change, many lives and properties are at risk of its impacts. This
paper reviews the recent past and present efforts in assessing the flood
impacts in Nigeria. We concentrate this study on the recent works
(methods and results) in assessing flood impacts in the country under
basic components of flood risk analysis: The hazards mapping and
modeling, exposure and vulnerability assessment, with the aim of
suggesting possible urgent needs and further development. Based on our
review, we conclude that, there is need to explore more effectively the
use of state of the art flood models, which integrates all hydrological
processes for more accurate prediction and mapping of flood and its
associated risks. Also, as one of the steps to plan for adaptation and
mitigation of future flood risk and climate change, there is a serious need
of detailed research in the development of regional or national flood
damage functions for pre-disaster flood damage estimation. The study
also suggests further study on the environmental and health impact of
flood in the country.

Publisher American Journal Of Environmental Sciences, Science Publications
Publication Type Journal
Publication Title AIR POLLUTION AND CLIMATE CHANGE IN LAGOS, NIGERIA: NEEDS FOR PROACTIVE APPROACHES TO RISK MANAGEMENT AND ADAPTATION
Publication Authors Akinola A. Komolafe, Suleiman Abdul-Azeez Adegboyega, Adeleye Y.B. Anifowose, Francis Omowonuola Akinluyi and Dauda Rotimi Awoniran
Year Published 2014
Abstract
The significance of air pollution as one of the contemporary issues and accelerating factors that propel
climate change in both developed and developing countries cannot be overemphasized. The problem of
air pollution has seemingly become intractable with the incessant failure of both global and local
environmental policies purportedly emplaced to address its devastating trend, particularly in growing
megacities of the world. The devastating effects of the phenomenon are more pronounced in megacities
of developing countries than in developed ones. Lagos, as an industrialized, commercialized and an
emerging megacity in Nigeria, has been subjected to several predictions of the negative impacts of
changing climatic conditions partly caused by ubiquitous air pollution. Efforts at stemming the tide of the
increasing challenges of air pollution worldwide has significantly been thwarted by inadequate funding,
hence the need to review the literature on the environmental implications of growing air pollution, its
contributions to climate change and its negative impacts on the lives and properties of teeming
inhabitants of Lagos. A review like this will provide a synthesis of knowledge and information on
mitigative and adaptive measures that can be adopted to minimize the impacts of air pollution on the
mega city.This study utilizes consciously selected and current literatures on the subject matter and found
that Lagos inhabitants have been vulnerable to virtually all forms of damaging effects of climate change
majorly propelled by seemingly uncontrollable air pollution. This implies that the situation requires
proactive measures, otherwise, avoidable loss of lives and large scale destruction of properties may be
inevitable. The paper therefore advocates involvement of all stakeholders in both mitigation and
adaptation measures to climate change through enhancement of indigenous knowledge and creation of
awareness among citizens about the need to be conscious of their carbon foot prints.

Publisher International Geoinformatics Research And Development Journal
Publication Type Journal
Publication Title Application Of GIS In The Mapping Of Petrochemical–Induced Groundwater Contamination From Underground Fuel Storage Tank Leakages In Ile-Ife, Southwestern Nigeria
Publication Authors Adeoti O. F; Akinluyi F.O; Isimekhai; Anifowose A.Y.B; Komolafe A. A.
Year Published 2014
Abstract
Petrochemical-induced groundwater contamination was investigated using an integrated GIS and physico-chemical
properties of sampled hand-dug wells close to fuel stations in Ile-Ife, Southwestern Nigeria. This was with a view to
evaluating the influence of hydrocarbon spills on groundwater resources within the vicinity of the supposedly
leaking underground fuel tanks. Topographic map and IKONOS image of the study area were acquired. Samples
from forty-two (42) fuel stations and thirty (30) hand-dug water wells were analyzed for organic compounds such
as benzene, ethylbenzene, toluene, xylene, and 1,2,4 trimethylbenzene using gas chromatography and mass
spectrometry. Geographic Information System (GIS) tools were employed to examine the spatial relationships
between the contaminants and to characterize their levels within the study area. Spatial analysis operations such as
spatial interpolation, raster based reclassification, buffering and map overlay were employed. The results obtained
were compared with World Health Organization (WHO) standards. Results indicate the presence of benzene in all
the water wells with concentrations ranging from 0.004 to 0.09 mg/l; pH, ethylbenzene, toluene, xylene and
trimethylbenzene have their highest values at 7.5, 0.074mg/l, 0.031 mg/l, 0.048 mg/l and 0.062 mg/l respectively,
while the electrical conductivity varies between 64 and 1538 μS/cm. Contaminations from these petrochemical
components were evident throughout the study area; of most significance is the increasing concentration level of
benzene and electrical conductivity which exceeded the WHO standard. Obafemi Awolowo University (OAU)
Campus, though not host to many fuel stations, appeared to contain moderately high levels of the organic
compounds, which can be attributed to the improper disposal of chemicals used in laboratory experiments, and
leakages from underground fuel storage tank in the Power House. The study concluded that most of the hand-dug
wells close to fuel stations in Ile-Ife, Southwestern Nigeria are contaminated

Publisher Ife Journal Of Geography, IFE
Publication Type Journal
Publication Title Time Series Analysis Of Shoreline Changes Along The Coastline Of Rivers State, Nigeria
Publication Authors Abiodun O. Adebola, Akinola A. Komolafe, Suleiman A. Adegboyega & Matthew O. Ibitoye
Year Published 2018
Abstract
The issue of shoreline changes, due to sea level rise over several centuries, has increasingly
become major social, economic and environmental concerns to a large number of coastal
countries worldwide. Coastal states in Nigeria, where shoreline changes pose a serious problem
to the environment and human settlements, are not exempted. The thrust of the study is to
demonstrate the potential of remote sensing, geospatial and statistical techniques in monitoring
shoreline changes and sea level rise along the coastline of Rivers state, in South-South region of
Nigeria. Multi-resolution and multi temporal satellite images of Landsat were utilized in
demarcating shoreline positions during 1984, 2000, and 2016. The time series images were
classified and the changes in land use land cover were extracted, and the shore line changes were
delineated and extracted using the Digital Shoreline Analysis System extension (DSAS) of the
ArcGIS 10.2.1. The study showed that both erosion and accretion were active along almost all
the coastline. It showed that about 70% of the coastline was under erosion within the selected
years, while 30% of the region experienced varying magnitude of accretion. High rate of
accretion was also observed along the river mouth side of the coast around the bar beach. The
results have provided information for proactive measures towards reducing risk by ensuring
qualitative and quantitative information on shoreline movement for effective environmental
management practices, timely management responses, and salvage the immediate physical
environment

Publisher International Journal Of Geosciences,, Scientific Research Publishing Inc.
Publication Type Journal
Publication Title Integrated Landsat Imagery And Geophysical Exploration For Groundwater Potential Evaluation Of Okene And Its Environs, Southwestern Nigeria
Publication Authors John Olurotimi Amigun, Richard Ajibola Faruwa, Akinola Adesuji Komolafe
Year Published 2015
Abstract
In this study, an integrated remote sensing and geophysical (aeromagnetic and geo-electric) methods
was employed to assess the potential of groundwater in a basement complex terrain of
Okene and its environs, Southwestern, Nigeria. Landsat imagery acquired over the study area was
processed in the Geographic Information Systems (GIS) environment to delineate the surface lineaments,
drainage networks and their orientations. Aeromagnetic data over the area were analyzed
and its derivative maps were interpreted to further map the structures and the geology in
the subsurface; depths to magnetic sources were determined using spectral analysis. Vertical Electrical
Sounding (VES) of geo-electric method was interpreted to map the subsurface geology layers.
The results of the integrated data were correlated with borehole yield data of the area for effective
interpretation. Delineated lineaments from the azimuth, frequency plot showed dominant trends
in the NE-SW and NNE-SSW directions. Radial average power spectrum revealed the depth to magnetic
sources between 100 and 2500 m and the interpreted VES data characterized the area into
three to four subsurface layers. In correlating the results with borehole yield data, the zones with
high lineament density and low/negative magnetic anomaly were categorized as high groundwater
potential zones while areas with low lineament density and high/positive magnetic anomaly as
low groundwater potential zones. This study will guide efficiently subsequent groundwater drilling
program in the study area.

Publisher AMERICAN JOURNAL OF SCIENTIFIC AND INDUSTRIAL RESEARCH, Science Hub
Publication Type Journal
Publication Title Hydrocarbon Reservoir Characterization Of "Keke" Field, Niger Delta Using 3D Seismic And Petrophysical Data
Publication Authors P.I. Edigbue; A.A. Komolafe; A.A. Adesida and O.J Itamuko
Year Published 2014
Abstract
An integrated 3D seismic and petrophysical data was employed to evaluate hydrocarbon
reservoir potentials of “Keke” field in the Niger Delta. Two sands units (S1 and S2), which exists
between 9127ft and 11152ft were correlated and mapped using gamma ray log while
petrophysical parameters were obtained from other well logs. The sand units were further
mapped on the seismic sections. Seismic structural attribute (variance) was used to delineate six
major faults in the field. Time and depth maps were generated for both top and base of the
horizons from which the isopach map was derived. Hydrocarbon in-place was calculated from the
obtained seismic and petrophysical parameters in order to unveil the potentials of the reservoirs.
Delineated sand units, S1 and S2 are characterized by hydrocarbon saturations of 65% and
81.8% respectively. Isopach map show thicker sediments in the central and southern parts of the
field ranging from 70ft to 90ft, isochron and isodepth revealed structural high (anticlines) at the
central fault block of the field sandwiched between the growth faults, which are responsible for
possible hydrocarbon accumulation. The trapping mechanisms are fault-assisted and rollover
anticlines. Hydrocarbon in-place for Sand S1 was estimated to be 14.6million ft3 of gas and
6,011.3 bbl of oil while Sand S2 showed 512.3764million ft3 of gas and 6041.94 bbl of oil. The
results show that the trapping mechanisms and the obtained Petrophysical parameters in “Keke”
field are favourable for hydrocarbon accumulation. Estimated reserves are satisfactory for further
exploration work

Publisher University Of Tokyo
Publication Type Conference
Publication Title Sensitivity Of Flood Damage Estimation To Spatial Scale
Publication Authors Srikantha Herath and Akinola Komolafe
Year Published 2014
Abstract
Pre-disaster economic loss estimation is an important element in flood risk assessment
and useful for mobilising investment and developing policies for flood loss prevention.
With the potential increase of magnitudes and intensities of climate hazards with
climate change pre-disaster loss estimation is becoming extremely important as many of
the flood risk reduction decisions are made based on cost benefit analysis. From a
global or regional view point it is also important to understand relative impacts on
economies of countries to mobilise international support and develop response
strategies under future climate scenarios. This requires a unified approach to flood
damage estimation across countries and over large areal extents. There are many
difficulties associated in undertaking such a task. Economic losses from floods are
estimated using loss functions which relate damage to properties and content based on
flood water levels. However, the classification of properties as well as approaches to
derivation of these functions differ from country to country. In addition spatial
resolutions used in the assessment have a direct impact on the estimation of potential
flood heights as well as representation of property exposure. In this paper we
investigate the sensitivity of spatial scale in estimating potential flood loss and what
approaches can be taken to minimise errors arising from coarse spatial resolutions