Electrical-hydraulic conductivity model for a weathered-fractured aquifer system of Olbanita, Lower BaringoBasin, Kenya Rift

作者：Benjamin SOSI,Justus BARONGO,Albert GETABU,Samson MAOBE

摘要：Groundwater yield in the Kenya Rift is highly unsustainable owing to geological variability.In this study,field hydraulic characterization was performed by using geoelectric approaches.The relations between electrical-hydraulic(eh)conductivities were modeled hypothetically and calibrated empirically.Correlations were based on the stochastic models and field-scale hydraulic parameters were contingent on pore-level parameters.By considering variation in pore-size distributions over eh conduction interval,the relations were scaled-up for use at aquifer-level.Material-level electrical conductivities were determined by using Vertical Electrical Survey and hydraulic conductivities by analyzing aquifer tests of eight boreholes in the Olbanita aquifer located in Kenya rift.VES datasets were inverted by using the computer code IP2Win.The main result is that ln T=0.537(ln Fa)+3.695;the positive gradient indicating eh conduction through pore-surface networks and a proxy of weathered and clayey materials.An inverse(1/F-K)correlation is observed.Hydraulic parameters determined using such approaches may possibly contribute significantly towards sustainable yield management and planning of groundwater resources.

發文機構：Department of Natural Resources Department of Geology epartment of Natural Resources

關鍵詞：ELECTRICALandhydraulicCONDUCTIVITYMODELWeathered-fracturedAQUIFERsystemOlbanitaKenyaRIFT

分類號： P64[天文地球—地質礦產勘探][天文地球—地質學]