Hydrogeophysical and aquifer protective capacity studies of Enugu and environs Southeastern Nigeria.
| dc.contributor.author | Udeh, Moses Harry | |
| dc.date.accessioned | 2025-02-27T12:47:30Z | |
| dc.date.available | 2025-02-27T12:47:30Z | |
| dc.date.issued | 2022-08 | |
| dc.description | A Master's thesis in hydrogeology. | |
| dc.description.abstract | Hydrogeophysical Studies of Enugu and environs were carried out using geophysical and hydrogeological method. This study was designed to evaluate the aquifer system of the study area as well its protective capacity and vulnerability by applying the models (Lc and IEC, GOD and DRASTIC), and also to evaluate soil corrosivity of the area by utilizing the topsoil (first layer) resistivity values obtained from the interpreted VES results. A total of eighty-five (85) vertical electrical sounding points were made in the study area that has three to nine geo-electric layers using the digital ABEM SAS 4000 model Terrameter with its accessories. The Schlumberger electrode configuration was adopted for data acquisition with half current electrode separation (AB/2) of 500m and half potential electrode separation (MN/2) of 55m. Nineteen (19) parametric soundings were carried out near existing boreholes where pumping data was available for correlative purposes and to constrain model predicting parameters. The aquifer resistivity of the area ranged from a value of 2.8 Ωm to 88745.0 Ωm, with a mean value of 5434.6 Ωm. The estimation of the characteristics of the aquifer hydraulic using the new set of model equations showed that hydraulic conductivity values varied between 1.05m/day and 34.06m/day with a mean value of 5.59m/day, while transmissivity values varied between 25.70 m2/day and 2767.81 m2/day with a mean value of 500.05 m2/day. Generally, the groundwater potentials of the area are classified into three categories: moderate, high, and very high potential zones. The multiple geophysical models were used together to develop maps of hydraulic parameters. The obtained GOD, and DRASTIC models were together used for the production of the vulnerability map. Results based on the GOD model clearly show that about 60% of the study area is within the class of extremely low groundwater vulnerability zones, 33% is within the class of low vulnerability zones, and 7% of the area is within the class of moderate vulnerability zone. Also, results based on the DRASTIC model revealed that about 31% of the study area is within the low class of vulnerability zones, 67% is within the class of moderate zones, while 2% is within the high class of vulnerability zones. The evaluated soil corrossivity of the area showed that 78% of the area is practically non-corrosive (PNC) and can be rated as moderately competent to highly competent strata; 13% of the area is said to be slightly corrosive, which is rated as moderately competent to incompent strata; and the remaining 9% is moderately and very strongly corrosive, which is rated as an incompenet material to construct on. The aquifer protective capacity of the study area were determined using longitudinal conductance technique. The protective capacity of the area classified into zone ofexcellent, very good, good, moderate, weak and poor protective capacity rating. Similarly, IntegratedElectrical Conductivity technique was also used to determine the protective capacity of the area, the result indicates that the aquifer system in the study area has low protective capacity and the areas are susceptible to contamination based on the IEC technique. | |
| dc.identifier.citation | Udeh, M. H. (2023). Hydrogeophysical and aquifer protective capacity studies of Enugu and environs Southeastern Nigeria, (Unpublished Master's thesis, Federal University of Technology, Owerri. | |
| dc.identifier.uri | https://repository.futo.edu.ng/handle/20.500.14562/1666 | |
| dc.language.iso | en | |
| dc.publisher | Federal University of Technology,Owerri | |
| dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International | en |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
| dc.subject | Vertical electrical sounding | |
| dc.subject | pumping Test | |
| dc.subject | aquifer hydraulics | |
| dc.subject | vulnerability | |
| dc.subject | soil corrossivity | |
| dc.subject | geology | |
| dc.title | Hydrogeophysical and aquifer protective capacity studies of Enugu and environs Southeastern Nigeria. | |
| dc.type | Master’s Thesis |