Abstract
Estimation of aquifer secondary hydraulic parameter distributions from surficial Geophysical measurement of primary parameters at Ngor–Okpala local government area of Imo State was carried out. The parameters estimated are practically significant in groundwater management. With the help of average permeability value for fine to coarse sandy formations, transmissivity and K?-values were obtained in addition to the Dar-zarouk parameters. The primary data which were validated by constraining the field data with the data obtained from logged borehole were converted to maps along with the estimated secondary parameters. Their distributions are diagnostic of significant information needed in groundwater assessment. The maps can also be used to improve the quality of model in the area.
Highlights
The hydraulic characteristics of subsurface aquifers are important properties for both groundwater and contaminated land assessments and for safe construction of civil engineering structures (Pantelis et al, 2007)
The aim of our study is to demonstrate the use of aquifer parameters in the assessment and measurement of the shallow groundwater resources of Ngor-Okpala in the Niger Delta area of Southern Nigeria
Some lower values are found in between the western and eastern parts of the area. This is an indication that in the areas where higher values are found, there are aquifer geomaterials that are predominantly gravels interlaced with fine sand while the area with lower resistivity values have pure fine sand intercalated with argillaceous materials
Summary
The hydraulic characteristics of subsurface aquifers are important properties for both groundwater and contaminated land assessments and for safe construction of civil engineering structures (Pantelis et al, 2007). It is noted that the factors which govern the current flow and conduction into the soil (lithology, size, shape, mineralogy, packing and orientation of grain, shape and geometry of pores and pore channel, magnitudes of porosity, tortuosity and permeability, compaction, consolidation and cementation, depth and water distribution) (Hubbard and Rubin, 2002) are extremely variable. This implies that the measured resistivity values are not absolute but relative, and only relative conclusions about the area’s hydraulic parameters should be made. Surface geophysical methods have been used for aquifer zone delineation and evaluation of the geophysical character of the aquifer in several locations (Niwas and Shinghal, 1981) (Singh, 2005) (Vanovameeren, 1989) (Arogunjo, 2002)
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