The evaluation of groundwater resources in the crystalline basement of northern Nigeria

3576 14 21659 4 42921 document 21659 Acworth81PhD.pdf application/pdf cca235876cddb95661429b2eda75651f MD5 20025053 2012-07-12 10:30:35 http://etheses.bham.ac.uk//id/eprint/3576/1/Acworth81PhD.pdf 3576 1 1 application/pdf application/pdf en public

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/21659 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/21659 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/21659 archive 4031 disk0/00/00/35/76 2012-07-13 10:43:27 2019-01-23 09:56:36 2012-07-13 10:43:27 thesis show 0 Acworth R. Ian ftp://ubira.bham.ac.uk/eTheses/3576_Acworth/ University of Birmingham The evaluation of groundwater resources in the crystalline basement of northern Nigeria unpub GE QE 40fac_sci A methodology of assessment is presented of the groundwater resources available in fracture zones, within the weathered mantle of gneiss, migmatite and granite. A model of weathering is developed, and values of porosity, hydraulic conductivity and electrical resistivity assigned to the different grades of weathering. A geophysical technique is developed, based upon a combination of electrical resistivity profiling and sounding, which allows a volume estimate of the various weathering grades to be made. A finite difference algorithm is used for this estimate which enables the apparent resistivity response of an inhomogeneous resistivity distribution to be calculated. An iterative approach is then adopted, adjusting the resistivity model until the calculated response agrees with the field data. An analysis of recharge in a savanna climate is developed based upon the Monteith equation for predicting evapotranspiration, and upon a model of unsaturated zone soil moisture movement. The recharge function developed is included in a one dimensional catchment water balance model. The results from this model are compared with observed runoff and groundwater hydrographs. The estimate of recharge is combined with the estimate of aquifer storage to produce an assessment of available groundwater. Optimal methods for the development of the resource are discussed. While developed in Northern Nigeria, the methodology of assessment is applicable to any similar geological and climatological environment. 1981-07 1981-05 graduation 246275 eng other Hollingworth and Moss This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 421 University of Birmingham Department of Geological Sciences d_ph na 1981-07 graduation