Ojuri Olumide Oluwapelumi (Publications)
Publisher International Journal Of Transportation Studies Vol.1. No.2, 40-47
Publication Type Journal
Publication Title An Analysis Of Traffic Volume And Parking In The Central Area Of Akure
Publication Authors Owolabi A.O. and Ojuri O.O.
Year Published 2004
Abstract

The parking problems and traffic congestion in the central business district (CBD) of Akure metropolis is already assuming a disturbing dimension. The reduced level of service of the roads within the CBD and the congestion hazards for both motorists and pedestrian, will definitely adversely affect the economic and social life of the community. This study has revealed that increased volume of traffic, ribbon development/street trading, improper structural layout/land use pattern, within the CBD are factors responsible for these problems. The superimposition of a radial traffic movement pattern on a morphologically linear road network in Akure, has however further compounded the problem. From the results of the data collected and the analysis of the traffic volume, spot speed and the number of weekly trips per capita for the CBD, the solution to the parking problems have been recommended. This includes, provision of adequate off-street parking facilities, abolition of all unauthorized terminals, adjustment of the structural layout/ land use pattern in the CBD and the provision of an inner ring road around the Akure CBD.


Publisher Journal Of Environmental Systems, USA
Publication Type Journal
Publication Title On-Site Wastewater Treatment System Design For A Marshy Urban Area In Nigeria
Publication Authors Ojuri O.O.
Year Published 2005
Abstract

This research aims at evaluating the efficiency of soil-based wastewater treatment systems in developing countries and designing an on-site wastewater treatment system for a difficult local site condition. Information on wastewater flow and wastewater quality, transport and fate of typical pollutants, conventional systems and treatment options, and various other design considerations, was reviewed from relevant texts and publications. A site and soil evaluation was carried out in order to locate the area to be used for the absorption field and determine soil characteristics, percolation rate, restriction, and groundwater table. The on-site wastewater treatment and disposal system was sited such that its separation from building structures and boundaries permits repair, maintenance of required separation from wells and reduces undesirable effects of underground wastewater flow and dispersion. The absorption area was sized based on an estimation of the household's wastewater flow and daily loading rate, which corresponds to the percolation rate of the receiving soil surface. The on-site wastewater treatment system designed for Danjuma area, Odi-Olowo Street, Akure, Ondo State, Nigeria, is comprised of a septic tank, dosing chamber and a mound system, which house the absorption area (drain field). The design was based on the minimum standards for design and construction of on-site wastewater systems in the state of Kansas [1]. The septic tank (2 m x 1.5 m x 2 m) was sized based on the estimated wastewater flow of 2160 liters day-1 and the dosing chamber (1 m x 0.75 m x 1 m) has half the size of the septic tank. The mound system recommended for this site, which experiences seasonal high water tables and occasional floods, was raised using well-graded sand. The absorption area (10.5 m x 10.5 m) was sized based on an estimated wastewater flow of 2160 liters day-1 and a daily loading rate of 20 liters m-2 day-1, which corresponds to the obtained percolation rate of 18 mins cm-1 (0.056 cm min-1).


Publisher African Research Review Vol.3(5)
Publication Type Journal
Publication Title Numerical Implementation And Computer Simulation Of Tracer Experiments In A Physical Aquifer Model
Publication Authors Ojuri, O.O. and Ola, S.A.
Year Published 2009
Abstract

The numerical model SandModel was developed and used to replicate the laboratory sand tank model. The model simulations predicted patterns of groundwater flow and chloride tracer flux. The method of finite difference was used to solve the 3-D Advection-Dispersion equation, while the FORTRAN 95 computer language was used to code the algorithm and develop the SandModel computer code. The model was validated by using the obtained model parameters from the physical sand tank model calibration; together with the porous media material properties in the numerical model. The plots of the TBCs for the twelve (12) multi-level observation points within the model domain show a reasonable match of the simulated and observed tracer breakthrough curves. The calculated t value (Paired-t test statistic) for each well is less than the critical value of t ( tcritical = 2.16 for df=13), and the calculated P value for each well is greater than the chosen significance level (P=0.05), therefore the null (no difference) between observed and simulated data sets hypothesis is accepted. The analysis also reveals high to very high correlation between the observed and simulated values (Average R2 = 0.86). It took eight (8) and Twelve (12) hours respectively for the tracer to reach its peak concentrations of 3.81mS/cm and 1.55mS/cm respectively for the middle (observation point (BM) [x,y,z] [70,15,24] and down gradient observation point (EM) [x,y,z] [30,15,24] within the sand tank model.A sensitivity analysis showed that the time required for complete source depletion, was most dependent on the source definition and the hydraulic conductivity K of the porous medium.Under the experimental conditions the 12000mg/l chloride tracer source was almost completely dispersed within 34 hours.


Publisher International Journal Of Applied Environmental Sciences (IJEAS) Vol.4 No.3
Publication Type Journal
Publication Title The Use Of Sand Tank Experiments To Simulate Field Conditions At The Contaminated Baruwa, Site, Nigeria
Publication Authors Ola S.A. and Ojuri O.O
Year Published 2009
Abstract

The analysis of dissolved contaminant fate and transport away from source areas containing non-aqueous phase liquids (petroleum hydrocarbon) is an important component in the evaluation of risk posed to down gradient receptors, of monitoring plan development, and of remedial alternative selection. Typically, individual source-plumes systems are evaluated on a site specific basis; however, much can be learned by looking at collective data from the integration of laboratory aquifer model and a field site. This has been done with a 3-D intermediate scale tropical sand tank model and a leaking underground petroleum pipeline site in south-western Nigeria. Numerical modelling and computer simulations were conducted for the physical laboratory model and the field site. Soil particle size and hydraulic conductivity data has been used to establish a correlation between the hydrodynamic transport parameters for the laboratory and field porous media soils. A Retardation factor R = 2.5, and biodegradation rate of 0.0004/day (half life of 5 years) were obtained from the model calibration for BTEX. A clean-up time for BTEX of about 48 years was estimated by natural attenuation from model predictions.


Publisher Bulletin Of Engineering Geology And The Environment. Vol.69
Publication Type Journal
Publication Title Contamination Potential Of Tar Sand Exploitation In The Western Niger-Delta Of Nigeria
Publication Authors Ojuri O.O., Ola S.A., Rudolph D.L and Barker J.F
Year Published 2010
Abstract

Exploitation of the tar sands in Ondo State in the Niger Delta is likely to result in some environmental contamination and adversely affect the living conditions of swamps the farmers and fishermen in the area. Three wells were established where samples were taken at 1, 2 and 3 m depth. Although no hydrocarbon contamination was detected in the water from the surface and boreholes, saline intrusion was recorded. This study produces a baseline against which future contamination can be monitored so that preventative measures can be taken to mitigate the effects.


Publisher International Journal Of Environmental Science And Technology (IJEST)
Publication Type Journal
Publication Title Estimation Of Contaminant Transport Parameters For A Tropical Sand In A Sand Tank Model.
Publication Authors Ojuri, O.O. and Ola, S.A
Year Published 2010
Abstract

This research describes the goals, design and implementation of a quasi natural gradient, laboratory scale, sand tank (aquifer) model experiment. The model was used to study the transport of an inorganic tracer (Chloride) in groundwater, within a tropical aquifer (porous medium) material. Three-dimensional sand tank (1.8 m × 0.3 m × 0.8 m) experiments were conducted to investigate contaminant transport and natural attenuation within the sand tank. In all, 360 samples were collected during 24 sampling sessions, for the three days of the tracer experiments in the Sand Tank. The Owena sand is a poorly graded sand with 88.1 % sand and 11.9 % gravel. Geotechnical properties including; coefficient of uniformity Cu = 2.53, coefficient of gradation Cz = 0.181, hydraulic conductivity K = 5.76 x 10-4 m/s, bulk density ρ = 1.9 Mg/m3, effective porosity ne = 0.215 and median grain diameter D50 = 0.55 mm, were determined. Other relevant hydraulic and solute transport parameters, such as dispersion coefficients and dispersivities were also established for the tropical soil.


Publisher Marine Georesources & Geotechnology
Publication Type Journal
Publication Title Plume Behaviour For Petroleum Hydrocarbon In A Tropical Sand Tank
Publication Authors Ojuri, O.O. and Ola, S.A
Year Published 2010
Abstract

Numerical simulations were performed to assess the reactive transport and natural attenuation of gasoline fuel components in a 3-D sand tank model. The conceptual model includes a residual gasoline source that dissolves into the 3-D aquifer. The analysis reveals high to very high correlation between the observed and simulated values (average R2=0.97). A retardation factor R=1.5, and first-order decay rate of 0.0002=day were obtained from the model calibration for BTEX. The results are highly relevant in the light of the increasing awareness of the precarious trend of lack of monitoring and remedial feasibility data for the subsoil environment in the thousands of gasoline fuel stations, and petroleum storage/distribution underground infrastructure and the riverbeds of inland waterways in Nigeria. The biodegradation rate was the most sensitive model parameter, with about 82% increase in BTEX maximum plume concentration, for the zero biodegradation scenario.

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Publisher NIL
Publication Type Journal
Publication Title Effect Of Soil Suction On The Compressibility And Strength Of North-Eastern Nigerian Black Cotton Soil.
Publication Authors Ojuri O.O
Year Published 2012
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Interlocking Stones Pavement As A Solution To Marshy Roads
Publication Authors Ojuri O.O
Year Published 2012
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Permeability And Compressibility Characteristics Of Municipal Solid Waste Samples Using A Fabricated Intermediate Scale Oedometer
Publication Authors Ojuri O. O
Year Published 2012
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Influence Of Nitrate Contamination On The Swell And Compressibility Characteristics Of A Tropical Clayey Soil
Publication Authors Ojuri O. O. and Akinwumi, I. I
Year Published 2012
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Standard Sand For Geotechnical Engineering And Geoenvironmental Research In Nigeria
Publication Authors Ojuri O. O. and Fijabi D.O
Year Published 2012
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Modeling Used Engine Oil Impact On The Compaction And Strength Characteristics Of A Lateritic Soil
Publication Authors Ojuri O. O. and Ogundipe O. O
Year Published 2012
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Predictive Shear Strength Models For Tropical Lateritic Soils
Publication Authors Ojuri O. O
Year Published 2013
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Groundwater Vulnerability Assessment And Validation For A Fast Growing City In Africa
Publication Authors Ojuri, O.O. and Bankole, O.T
Year Published 2013
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Groundwater Vulnerability Assessment And Validation For A Fast Growing City In Africa
Publication Authors Ojuri, O.O. and Bankole, O.T
Year Published 2013
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Modelling LNAPL Plume Breakthrough And Saltwater Intrusion, For A Coastal Site In The South-western Nigeria
Publication Authors Ojuri, O.O. and Ola, S.A
Year Published 2010
Abstract

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Publisher NIL
Publication Type Journal
Publication Title Modeling The Effect Of Suction Change On A Tropical Black Clay Aquitard During Consolidation
Publication Authors Ojuri O. O. and Okonta F. N
Year Published 2013
Abstract

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Publisher NIGERIAN SOCIETY OF ENGINEERS
Publication Type Conference
Publication Title Remediation Of Hydrocarbon Contaminated Sites
Publication Authors Ola, S.A. and Ojuri, O.O
Year Published 2008
Abstract

The paper reviews Phase I, II, III Environmental Site Assessment for contaminated sites as practised in Canada. It focuses on hydrocarbon contaminated sites and various methods of site remediation. A typical case study of a leaking petrol station close to a harbour with a highly sensitive water body in the Vancouver Island, British Columbia, Canada is presented. Site remediation carried out at the site included soil characterization, delineation of the contaminant plume, and construction of a drainage trench cutoff. Ground water remediation included aeration, setting up a biopile, soil vapour extraction by soil venting, and biodegradation. About 1,420 tonnes of contaminated soils and the entire ground water at the site were remediated.


Publisher ICAT
Publication Type Conference
Publication Title Surface And Subsurface Assessment Of Urban Hand Dug Wells In Akure, Nigeria
Publication Authors Ojuri O. O. and Okonta F. N.
Year Published 2012
Abstract

Hand dug wells which are self-supply systems are still the most common technique of ground water exploitation in developing countries. The aim of this research work is the statistical assessment of the state of the art and technology in hand dug water supply well design, construction and maintenance in a developing country like Nigeria. The overall statistics of the study shows that 74% of the wells in the area of case study are provided with lining (masonry or concrete), 68% have an apron and 78% of the wells are located 15 m and farther away from soak-away pit. Depth to water table ranged from 2.5 m to 20.0 m, with an average depth to water table of 7.0 m for the 200 sample wells. The local lithologic units identified in the study area are the charnokites, pegmatites, migmatite – gneiss, biotite gneiss and granites. The water level for most of the wells occur within the partially weathered rock zone and fractured/weathered rock as expected for the basement complex rock geology of the study area. This is usually preceded by lateritic/sandy clay soil strata which portends some level of protection for the underground water formation.


Publisher NIL
Publication Type Technical Papers
Publication Title Geo-environmental Impact Assessment And Remediation Of Contaminated Soil/Groundwater, Western Niger-Delta, Nigeria
Publication Authors Ojuri O.O
Year Published 2004
Abstract

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