- Nigeria
- Niger Delta, Geotechnical, Hydraulic conductivity, Physical Oceanography, Regional Ocenography, Aspect of Physical Oceanography, and 9 moreHydrogeology, Soil Quality, Geology, Hydrogeology and Environmental Geology, Watershed Management, Hydrochemistry, Soil Erosion, Chemical Oceanography, and Groundwateredit
- Dr. H.O Nwankwoala is a Senior Lecturer in the Department of Geology, University of Port Harcourt, Nigeria. He is a p... moreDr. H.O Nwankwoala is a Senior Lecturer in the Department of Geology, University of Port Harcourt, Nigeria. He is a prolific Researcher and has published articles in reputed indexed journals.edit
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This study evaluates the groundwater quality status of shallow groundwater in Ogbia, using water quality index (WQI) with a view to ascertain its suitability for domestic and industrial purposes. Groundwater samples were collected from... more
This study evaluates the groundwater quality status of shallow groundwater in Ogbia, using water quality index (WQI) with a view to ascertain its suitability for domestic and industrial purposes. Groundwater samples were collected from thirty (30) functional boreholes within fifteen (I5) communities of the study area. These water samples were subjected to a comprehensive Physico-Chemical Analysis using standard methods. The water quality index (WQI) of the area was calculated using weighted arithmetic mean and statistical package for social science (SPSS) version I5, software. Seventeen (I7) chemical parameters were considered for the WQI calculation. The results revealed that I0% of the water samples were in the excellent category, 46.6% were in the good water category while 43.3% of the water samples were in the poor water category. The high value of the water quality index (WQI) has been found to be mainly from the higher values of Iron, phosphate, pH and electrical conductivity....
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Research Interests: Remote Sensing, Plant Biology, Aquatic botany, Land Cover, Surface Water, and 9 moreWater resource management, Riparian vegetation, River Basin, Super Line Graph, Water Resource, Geographic Information System, ENVIRONMENTAL SCIENCE AND MANAGEMENT, United States Geological Survey History, and buffer zone
This study aims at establishing the sub-soil types and profile to ascertain the geotechnical characteristics of the underlying soils in parts of Yenagoa, Bayelsa State, Nigeria and recommend appropriate foundation design and construction... more
This study aims at establishing the sub-soil types and profile to ascertain the geotechnical characteristics of the underlying soils in parts of Yenagoa, Bayelsa State, Nigeria and recommend appropriate foundation design and construction of projects in the area. Four boreholes were drilled using hand auger and representative disturbed samples were taken at regular intervals of 1.0m depth, and also when a change in soil type was observed. Standard laboratory procedures were used in the analysis of the samples. Water levels recorded in the site BH-1 (1.50m), BH-2 (1.50m), BH-3 (4.00m) and BH-4 (1.00m), respectively. Geotechnical result reveal that the area is underlain predominantly by medium to firm silty clay (although) in BH-1, silty sand and medium to fine silty clay in BH-2 and medium to firm silty clay at the top, silty sand (middle) and fine to medium sand at the bottom of BH-3 and BH-4, respectively. Water level (WL) recorded in the site for BH-1 (1.50m), BH-2 (1.50m), BH-3 (4...
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This study aims at investigating the effects of waste dumps on the groundwater in Eneka using resistivity method. Two dump sites and a dump-free site were investigated in the area. The investigation involved seven horizontal resistivity... more
This study aims at investigating the effects of waste dumps on the groundwater in Eneka using resistivity method. Two dump sites and a dump-free site were investigated in the area. The investigation involved seven horizontal resistivity profiling and four vertical electrical soundings. The result of the investigation revealed that the surrounding soil and water in the waste dumpsites have been contaminated to depths below 20 meters which is within the aquifer system of the area. This was evident in the attendant low resistivity values of 0.04 ohm.m 60.07 ohm.m around the dumpsites relative to the high resistivity values greater than 500 ohm.m in the dump free areas. The results of the investigation are serious considering the negative implications on public health and the ecosystem of the area if not checked, monitored and managed.
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This study investigates the environmental impact of a recent oil spill incident in the Bonny terminal using groundwater media. The objective was to establish the presence of Contaminants of Concern (COC), determine, quantify and model... more
This study investigates the environmental impact of a recent oil spill incident in the Bonny terminal using groundwater media. The objective was to establish the presence of Contaminants of Concern (COC), determine, quantify and model spilled volumeIEEE Transactions on Components, Packaging, and Manufacturing Technology and ascertain potential health risks associated with the spill incident. The COC included Total Petroleum Hydrocarbons (TPH), Polyaromatic Hydrocarbons (PAH), and BTEX compounds. Groundwater was sampled in the vicinity of the spill incidents and further away into the surrounding communities. Groundwater assessment showed that TPH ranges from 9.04 to 20,600 µg/L with a mean value of 2526.90 ± 6392.40 µg/L. Apart from four boreholes, all others had TPH values exceeding the DPR target value of 50 µg/L. PAH was recorded only at three boreholes, with values: 0.13, 1.07, and 0.25 µg/L, respectively. Meanwhile, BTEX compounds had concentration (5910 µg/L) that exceeded the ...
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This study aims at the assessment of the impacts of artisanal refining of crude on soil and water quality in parts of Okrika and Ogu-Bolo areas of Rivers State, Nigeria. Standard sampling methods were used in the study. A total number of... more
This study aims at the assessment of the impacts of artisanal refining of crude on soil and water quality in parts of Okrika and Ogu-Bolo areas of Rivers State, Nigeria. Standard sampling methods were used in the study. A total number of sixteen (16) sampling points were selected using random sampling techniques for the water points and soil samples within Ogu-Bolo and Okrika. Water and soil samples were analyzed in the laboratory using standard methods. The ArcGIS version 10.3, ENVI version 4.7, Surfer 10, SPSS 22 and Microsoft Enterprise were used for the interpretation. The Digital Elevation Model (DEM) was created from the elevation data obtained from Short Radar Thematic Mapper (SRTM) satellite image and contour extracted from the topographic map. The influence of the soil type, slope, flow accumulation and flow direction of the study area was used to delineate the level of contaminant plume. This was generated from the DEM using the ArcGIS 10.3 3-D analyst tool function. A wat...
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Disaster risk is incubated through series of events that shape and reshape hazards and vulnerability. The gradual destruction of a diversity of ecosystems leading to the depletion of ecosystem services is an incubation period for many... more
Disaster risk is incubated through series of events that shape and reshape hazards and vulnerability. The gradual destruction of a diversity of ecosystems leading to the depletion of ecosystem services is an incubation period for many disasters as the case of Makurdi wetlands and flood disasters. Makurdi wetlands have been destroyed with only a few remaining according to a recent thirty-year study. This suggests the loss of very important ecosystem services that they provide including defense against surging flood waters. In the corresponding period, increased flood disaster incidences have been reported in Makurdi with a corresponding increase in size and intensity of devastating impact on the populations. Surprisingly surveys carried out in Makurdi on the causes of flood demonstrate a very limited knowledge on the significance of wetlands in the management of flood disasters. The ability of ecosystems to continue to provide ecosystem services require deliberate management action t...
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Many researchers used gauge data from weather stations for rainfall estimate across Africa. Since Africa lies within the tropics, there is possibility for variations in rain received from place to place. Therefore, there is need for... more
Many researchers used gauge data from weather stations for rainfall estimate across Africa. Since Africa lies within the tropics, there is possibility for variations in rain received from place to place. Therefore, there is need for excessive density of the gauges for accurate estimate of Africa’s rainfall. Due to numerous challenges, these cannot be achieved. This necessitates the application of remote sensing and GIS to detect changes in rainfall amount in Africa between 1999 and 2018. The data used was obtained from remote sensing satellite (TRMM) and analyzed using GIS application (IDRISI Taiga). The Simple Image Differencing was performed on the two annual mean images covering January to December, 1999 and January to December, 2018. This provides reliable information on rainfall estimate that can complement sparsely and unevenly distributed rain gauge network in Africa. The analysis shows that latitudinal locations, to some extent, determine spatial distribution of rainfall in ...
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Water is a primary source of life and is required in sufficient quantity and acceptable quality to sustain all human activities such as domestic, agricultural and industrial needs. This requirement however, is hardly fulfilled due to... more
Water is a primary source of life and is required in sufficient quantity and acceptable quality to sustain all human activities such as domestic, agricultural and industrial needs. This requirement however, is hardly fulfilled due to various natural and anthropogenic activities. Remote sensing and Geographic Information System (GIS) techniques are useful in hydrological research and applications. Remote sensing observations enable improved characterization of the land surface which are relevant in hydrological studies. Remote sensing with its merits of providing spatially extensive, multi-temporal and cost effective data, has become a very handy tool in identifying hydrogeological processes. These studies have revealed the application of integrated remote sensing and GIS technologies in groundwater exploration and exploitation. Integrated remote sensing and GIS are widely used in groundwater mapping. Locating potential groundwater targets is becoming more convenient, cost effective than invasive methods and efficient with the advent of a number of satellite imagery. The nature of remote sensing-based groundwater exploration is to delineate all possible features connected with localization of groundwater. Data, driven out of remote sensing, support decisions related to sustainable development and groundwater management. Integration of remotely sensed data, GPS, and GIS technologies provides a valuable tool for monitoring and assessing water pollution. Remotely sensed data can be used to create a permanent geographically located database to provide a baseline for future comparisons hydrological studies. The integrated use of remotely sensed data, GPS, and GIS will enable consultants and natural resource managers to develop management plans for a variety of natural resource management applications.
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In river systems, surface water has been widely used as environmental indicators and their chemical analysis can provide significant information on the assessment of anthropogenic activities. The paper evaluates the pollution status of... more
In river systems, surface water has been widely used as environmental indicators and their chemical analysis can provide significant information on the assessment of anthropogenic activities. The paper evaluates the pollution status of the Imo River with reference to heavy metal enrichment. The mean concentration of the ten metals used in this study was slightly higher than the recommended maximum permissible limit by the Nigerian Standard for Drinking Water Quality except zinc. The results of the metal pollution index revealed that the river is slightly to moderately polluted with metals. The application of factor analysis on the data-set identified three factors which imply that these metals enter the river through three possible sources. Factor one comprises of pH, nickel, lead, iron and cadmium and accounts for 34.46% of the total variance. Factor two has a moderate loading of 25.89% of the total variance with arsenic, mercury, chromium and manganese as contributors. Factor thre...
This study investigates the environmental impact of a recent oil spill incident in Bonny terminal using groundwater media. The objective was to establish the presence of Contaminants of Concern (COC), determine, quantify and model spilled... more
This study investigates the environmental impact of a recent oil spill incident in Bonny terminal using groundwater media. The objective was to establish the presence of Contaminants of Concern (COC), determine, quantify and model spilled volume IEEE Transactions on Components, Packaging and Manufacturing Technology and ascertain potential health risk associated with the spill incident. The COC included Total Petroleum Hydrocarbons (TPH), Polyaromatic Hydrocarbons (PAH) and BTEX compounds. Groundwater was sampled in the vicinity of the spill incidents and further away into the surrounding communities. Groundwater assessment showed that TPH ranges from 9.04 to 20.60 μg/L with a mean value of 2526.90 ± 6392.40 μg/L. Apart from four boreholes, all others had TPH values exceeding DPR target value of 50μg/L. PAH was recorded only at three boreholes, with values: 0.13, 1.07, and 0.25μg/L, respectively. Meanwhile, BTEX compounds had concentration (5910 μg/L) that exceeded Directorate of Pe...
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Highlights Graphical Abstract Article Info Abstract * Corresponding author: h.o.nwankwoala@gmail.com (HO. Nwankwoala) RESEARCH PAPER • Ecosystem degradation and incubation at risk of natural disasters such as floods. • The gradual... more
Highlights Graphical Abstract Article Info Abstract * Corresponding author: h.o.nwankwoala@gmail.com (HO. Nwankwoala) RESEARCH PAPER • Ecosystem degradation and incubation at risk of natural disasters such as floods. • The gradual destruction of a diversity of ecosystems leading to the depletion of ecosystem services. • Disaster risk is incubated through a series of events that shape hazards and vulnerability. • Floods and their consequences pose serious risks and vulnerabilities in Makurdi. Disaster risk is incubated through a series of events that shape and reshape hazards and vulnerability. The gradual destruction of a diversity of ecosystems leading to the depletion of ecosystem services is an incubation period for many disasters as the case of Makurdi wetlands and flood disasters. Makurdi wetlands have been destroyed with only a few remaining according to a recent thirty-year study. This suggests the loss of essential ecosystem services that they provide, including defense agai...
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This study aims at the assessment of the impacts of artisanal refining of crude on soil and water quality in parts of Okrika and Ogu-Bolo areas of Rivers State, Nigeria. Standard sampling methods were used in the study. A total number of... more
This study aims at the assessment of the impacts of artisanal refining of crude on soil and water quality in parts of Okrika and Ogu-Bolo areas of Rivers State, Nigeria. Standard sampling methods were used in the study. A total number of sixteen (16) sampling points were selected using random sampling techniques for the water points and soil samples within Ogu-Bolo and Okrika. Water and soil samples were analyzed in the laboratory using standard methods. The ArcGIS version 10.3, ENVI version 4.7, Surfer 10, SPSS 22 and Microsoft Enterprise were used for the interpretation. The Digital Elevation Model (DEM) was created from the elevation data obtained from Short Radar Thematic Mapper (SRTM) satellite image and contour extracted from the topographic map. The influence of the soil type, slope, flow accumulation and flow direction of the study area was used to delineate the level of contaminant plume. This was generated from the DEM using the ArcGIS 10.3 3-D analyst tool function. A wat...
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This study aims at investigating the effects of waste dumps on the groundwater in Eneka using resistivity method. Two dump sites and a dump-free site were investigated in the area. The investigation involved seven horizontal resistivity... more
This study aims at investigating the effects of waste dumps on the groundwater in Eneka using resistivity method. Two dump sites and a dump-free site were investigated in the area. The investigation involved seven horizontal resistivity profiling and four vertical electrical soundings. The result of the investigation revealed that the surrounding soil and water in the waste dumpsites have been contaminated to depths below 20 meters which is within the aquifer system of the area. This was evident in the attendant low resistivity values of 0.04 ohm.m-60.07 ohm.m around the dumpsites relative to the high resistivity values greater than 500 ohm.m in the dump-free areas. The results of the investigation are serious considering the negative implications on public health and the ecosystem of the area if not checked, monitored and managed.
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Some physicochemical parameters related to groundwater quality obtained from Yola Area of Northeastern Nigeria was investigated for the purpose of drinking and irrigation. An attempt was also made to develop linear regression equations to... more
Some physicochemical parameters related to groundwater quality obtained from Yola Area of Northeastern Nigeria was investigated for the purpose of drinking and irrigation. An attempt was also made to develop linear regression equations to predict the concentration of water quality having significant correlation coefficients with electrical conductivity (EC). The TDS and EC has perfect correlation coefficients whereas Na+ and Cl-, are highly correlated in all the water sources. Furthermore while Ca2+ and HCO3- are highly correlated in both the shallow and deep groundwater they have relatively lower correlation coefficients in the surface water samples. It was equally observed that Mg2+, Ca2+, NO3-, Cl- and Fe are highly correlated with EC in surface water samples. The data also indicated that apart from surface water bodies Ca2+, NO3-, Cl- and HCO3- are poorly related with electrical conductivity at 5% level of significance. These data has shown that linear regression equations can b...
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This study is concerned with creating an environmental resource database for Etche Local Government Area in the Niger Delta Region of Nigeria. The study reveals the techniques that could be employed in oil spill management. The study was... more
This study is concerned with creating an environmental resource database for Etche Local Government Area in the Niger Delta Region of Nigeria. The study reveals the techniques that could be employed in oil spill management. The study was aimed at identifying the different anthropogenic activities that can cause oil spill in the study area and attempt at inventory of landuse/landcover that are likely to be affected by any oil spill in the area. It also built a viable database for oil spill management in the area. Data were collected and imported into GIS environment for analysis using ESRI-GIS softwares. Results indicate that about 47.21%, almost half of the study area is cultivated land. However, three (3) different buffer zones were created. The waterbodies in the area were identified as the major oil spill distributor. Out of total area of 391.2 km2 covered by the buffer region, cultivated land occupies the highest areal extent of 35.59%, while rubber plantation has the least area...
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ABSTRACT The isotopic compositions of oxygen (δ 18O) and hydrogen (δ 2H) of precipitation were determined from three different locations in the western Niger Delta (Warri, Ughelli and Abraka) between 2014 and 2015. 18O and 2H in wet... more
ABSTRACT The isotopic compositions of oxygen (δ 18O) and hydrogen (δ 2H) of precipitation were determined from three different locations in the western Niger Delta (Warri, Ughelli and Abraka) between 2014 and 2015. 18O and 2H in wet season precipitation were more depleted compared to the dry season. Similarly, d-excess computed for wet season precipitation is lower than that for the dry season. The δ 18O and δ 2H variations in precipitation suggest the effect of the convective system and north-easterly and south-westerly trade winds. The decrease in δ 18O and δ 2H was also observed in precipitation data of a continuous rain event of two successive days. The local meteoric water lines estimated for Warri, Ughelli and Abraka were δ 2H = 8.8 δ 18O + 9.1 ‰ (R 2 = 0.93), δ 2H = 6.9 δ 18O + 10.7 ‰ (R 2 = 0.98) and δ 2H = 7.9 δ 18O + 11.3 ‰ (R 2 = 0.87), respectively. The Niger Delta regional meteoric water line of δ 2H = 7.7 δ 18O + 10.2 ‰ (R 2 = 0.91) was derived from the monthly average from the three locations. The provided local meteoric water line for the Niger Delta from unweighted stable isotopic data represents a baseline for regional water resources studies.
ABSTRACT Soil organic carbon (SOC) and soil total nitrogen (STN) concentrations and stocks are essential for improving soil quality and increasing C-reservoir. The study aimed at quantifying the dynamics of soil properties under different... more
ABSTRACT Soil organic carbon (SOC) and soil total nitrogen (STN) concentrations and stocks are essential for improving soil quality and increasing C-reservoir. The study aimed at quantifying the dynamics of soil properties under different land use in Imo watershed where there is no knowledge about the effects of land use on SOC and STN pool. Six land use: arable land (AL), forest land (FL), grassland (GL), shrubland hills (SL), urban built-up green (UL), and freshwater swamp-mangrove wetland (WL) were classified using ArcGIS 10.1 and FAO land use classification system. Soil samples were collected and analyzed from each land use under different soil depths and slope positions with three replications. Topsoil layer (0–30 cm) contributed to more than 90% of the total soil nutrients. Land use significantly affected SOC content, STN content, and bulk density. SOC and STN concentrations were in the order of FL > WL > GL > SL > UL > AL which revealed the potentials of FL and WL for SOC and STN sequestration. The study provides land users with the information to improve soil quality, conserve C and N stocks for ecological sustainability and climate change mitigation.
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Changes in season is one of the important drivers responsible for pollutants transported into surface waters. This study examined the seasonal variations in the quality of Imabolo stream water within Ankpa urban, Kogi State, Nigeria. To... more
Changes in season is one of the important drivers responsible for pollutants transported into surface waters. This study examined the seasonal variations in the quality of Imabolo stream water within Ankpa urban, Kogi State, Nigeria. To achieve the aim of the study, water samples were collected at the peak of the two seasons from seven points along the stream reach corresponding to the different land-use activities in the study area in March and June, 2018. In-situ and laboratory analysis of eighteen physico-chemical and two microbiological parameters were carried out according to standard procedures. Descriptive statistics and t-test were employed to analyze the data obtained for both dry and rainy seasons. The results were compared with WHO and NSDWQ standards for drinking water quality for characterization. The analysis revealed that water samples from six points had elevated values of parameters above the recommended limits for human consumption. The observed seasonal variation ...
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The investigation is to determine the suitability of the study site for the design and construction of a shoreline protection and also carry out reclamation exercise at the adjoining lands. Nine (9) number boreholes were drilled to a... more
The investigation is to determine the suitability of the study site for the design and construction of a shoreline protection and also carry out reclamation exercise at the adjoining lands. Nine (9) number boreholes were drilled to a maximum depth of 20.0m below the existing ground level using a cable percussion rig and nine (9) numbers Cone Penetrometer Testing using 2.5 tonne CPT equipment. The lithology reveals intercalations of clay and sand in thin layers to a depth of 2.0m below the existing ground level. Only borehole 3 revealed the clay layer to a depth of 5.0m. Underlying this clay is a stratum of loose to medium dense sand and dense sand. The sand is well sorted grading from fine to medium as the borehole advances. The laboratory analysis showed that the silty clay has undrained shear strength of 48 kPa. The loose sand has a maximum SPT (N) value of 12 while the medium dense sand has maximum SPT (N) value of 28. Considering the nature of the intended structure, the anticip...
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Three wells were sunk with a hand-operated light cable percussion rig to the maximum depth of 15.00 to 21.00 m. The static water levels recorded after drilling for each well were 8.00 m for borehole 1 (BH 1), 4.40 m for BH 2, and 5.00 m... more
Three wells were sunk with a hand-operated light cable percussion rig to the maximum depth of 15.00 to 21.00 m. The static water levels recorded after drilling for each well were 8.00 m for borehole 1 (BH 1), 4.40 m for BH 2, and 5.00 m for BH 3. The soil stratigraphy reveals a uniform correlation in the three boreholes of medium to very coarse grained sand and gravelly sand. The lower layers are coarser, so that there appears to be a downward coarseness of the grains. There is also a downward decrease in the shade of brownish color. In BH 1, there is an upper stratum of dark brown, mediumgrained, friable sand to a depth of about 9.00 m. This is underlain by light brown, very coarse-grained, gravelly sand. BH 2 and BH 3 display similar profiles of overlying dark brown, medium-grained, friable sands of about 3.0 m in thickness. This is followed by light brown, coarse-grained sands to depths of about 15.00 m. Light brown, very coarse grained, gravelly sands extend from this depth to t...
An assessment of groundwater quality characteristics as well as heavy metal concentrations from twenty five (25) locations in various parts of Bayelsa States of Nigeria, was carried out in order to evaluate and determine the suitability... more
An assessment of groundwater quality characteristics as well as heavy metal concentrations from twenty five (25) locations in various parts of Bayelsa States of Nigeria, was carried out in order to evaluate and determine the suitability of the water for domestic and other uses. The pH, which was measured both in the field and in the laboratory, ranged from 5.32 to 7.70. Turbidity values ranged from 1.46 NTU to 184 NTU with Total Suspended Solids (TSS) from 40 mg/L to 597 mg/L. Hardness concentrations ranged from 1.06 mg/L to 97.64 mg/L. Chloride (Cl2) values ranged from 5.32 mg/L to 41.75 mg/L, while the Nitrate (NO3) ranged from 0.35 mg/L to 8.16 mg/L. The recorded manganese concentrations ranged from 0.01 to 2.34 with a mean value of 0.40 mg/L. The results also showed that there was 100% compliance for Arsenic in all the water samples. The high concentrations of some heavy metals in the groundwater could be due to the intensive oil production activities with extensive gas flaring....
The study involves the analyses of the physicochemical and microbiological concentrations of groundwater from 12 water samples for both dry and wet seasons. The aim was to determine the spatial and temporal variations of the ambient... more
The study involves the analyses of the physicochemical and microbiological concentrations of groundwater from 12 water samples for both dry and wet seasons. The aim was to determine the spatial and temporal variations of the ambient groundwater quality for both seasons and of the processes leading to an improved understanding of the groundwater in the area. Sixteen quality parameters include: pH, Turbidity, TSS, Conductivity, Total Hardness, Cl–, PO4, NO3–, SO4 2–, HCO3-, Fe, Zn, Cr, Cu and Pb. The study revealed that pH values ranged from 5.17 to 6.50 in both seasons, indicating that almost all samples were slightly acidic in both seasons. The relatively high values of some of the parameters in the wet season could be attributed to the influx of sediments from interland and waste from dumpsites as well as human activities. Heavy metal concentrations in most of the locations were found to fall below the WHO (2006) limits, except iron that exceeded the limit. The bacteriological anal...
The study area (Port Harcourt) in the Niger Delta region is vulnerable to global and regional climate change particularly that associated with sea level change. Thus, sea-level rise and repeated ocean surges will not only worsen the... more
The study area (Port Harcourt) in the Niger Delta region is vulnerable to global and regional climate change particularly that associated with sea level change. Thus, sea-level rise and repeated ocean surges will not only worsen the problems of coastal erosion that are already a menace in the Niger Delta, but would accelerate the associated inundation, increase problems of floods, intrusion of sea-water into freshwater sources and ecosystems and destroying such stabilizing system as mangrove, and affecting agriculture, fisheries and general livelihoods. The study area has not been monitored for sufficiently long periods as to provide useful data to support detailed coastal modeling. This is a task that must be emphasized and taken seriously by relevant governmental institutions as it would facilitate sustainable coastal zone management. This paper therefore identified the threats of inundation and erosion arising from sea level rise on the basis of existing tidal limits and indicati...
... Permeability values vary from 6.80 x10-3 cm/s to 9.43 x10-3 cm/s ... Soil consistency shows a plasticity range (7.00 13.00%) for the clayey soils with the predominantly ... Therefore, regular assessment of the subsoil... more
... Permeability values vary from 6.80 x10-3 cm/s to 9.43 x10-3 cm/s ... Soil consistency shows a plasticity range (7.00 13.00%) for the clayey soils with the predominantly ... Therefore, regular assessment of the subsoil characteristics and hydrogeology of the area will provide baseline ...
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ABSTRACT The increasing need for human habitation and rapid industrialization has necessitated extensive land reclamation in the choice area of Borokiri, Port Harcourt, Nigeria. This study was carried out to investigate the possible... more
ABSTRACT The increasing need for human habitation and rapid industrialization has necessitated extensive land reclamation in the choice area of Borokiri, Port Harcourt, Nigeria. This study was carried out to investigate the possible effect of land reclamation on the groundwater in the area. Soil resistivity measurements were taken using the Schlumberger Vertical Electrical Sounding (VES) method, with a total electrode AB/2 of 350 m which covered a probe depth of about 150 m. The resulting resistivity data were iterated using a RES2DINV Computer Program. The results were used to map the quality potential of groundwater in the area. The results of the mapping process indicate that freshwater exists at shallow depths up to 33 m in the area. It was found that freshwater horizon is underlain by saline water up to about 133 m below ground surface. The depth at which freshwater occurs was found to be vulnerable to pollution from surface anthropogenic activities.
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ABSTRACT Hydro-geotechnical mapping of the study area, which lies within the Sombreiro – Warri deltaic plain in the Niger Delta area, comprised the drilling of representative boreholes as monitoring wells. Three (3) boreholes were sunk in... more
ABSTRACT Hydro-geotechnical mapping of the study area, which lies within the Sombreiro – Warri deltaic plain in the Niger Delta area, comprised the drilling of representative boreholes as monitoring wells. Three (3) boreholes were sunk in the area with soil and water samples collected for laboratory analyses according to Department of Petroleum Resources (DPR) and international standards. The physical properties of the soils were determined and used as indices of their infiltration capacity and classification. Water quality analysis was for physicochemical and microbiological parameters. Boreholes logged to the maximum – drilled depth of 10m, revealed fine – grained, high plasticity clay and medium to coarse –grained sands with fines of silt and clay overlying the aquifer. Static water levels were in the range of 1.2 to 2.0m below ground elevation. The aquifer was determined to be confined in one area but was mostly semi - confined (leaky) and this condition may permit gradual infiltration of pollutants into the upper aquifer. Environmental hazards that may occur in the area may include sheet erosion and flooding. It is recommended that the provision of dedicated flow lines will ensure a flood free environment. @ JASEM