Estimating unsaturated hydraulic conductivity of a sandy clay loam soil from Bulk density data

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dc.contributor.authorNatai, Shakwaanande Roland
dc.date.accessioned2025-12-04T12:04:32Z
dc.date.available2025-12-04T12:04:32Z
dc.date.issued1997
dc.descriptionMasters' Theses
dc.description.abstractThe Gardner parameters field model, K Kgat/[1 + (bhj"] , with three (Ksat, b, n) , was calibrated and validated with dataforestimating conductivityfora the sandy clay unsaturatedhydraulic insemi-arid loam soil Dodoma, Tanzania. Calibration of the model was achieved by measuring the in situ saturated and unsaturated hydraulic conductivity at different levels of bulk density (1.43, 1.64, 1.85 Mg/m3) and matric suction (0.0, 0.2, 0.5, 0.8 and 1.0 kPa) using the Disc Permeameter method which is a surface technique. Ksat was obtained from the graph of log(K,sat) versus bulk density. The parameters b and n were obtained by solving the simultaneous equations obtained by measuring different soil matric suctions. K at For the sandy clay loam soil at Hombolo, Ksat was obtained from the linear equation, log(K3at ) = 5.644 2.164Qb and values of b and n are 0.66 and 1.32, respectively. The model was validated using the Disc Permeameter method by measuring the in situ unsaturated hydraulic conductivity at different bulk densities (ranging between 1.3 and 2.1 Mg/m3) and different matric suctions (0.2, 0.5, 0.8 and 1.0 kPa within the same range of bulk density) from the plots which initially were not used in the model measurements. calibration The unsaturated hydraulic conductivity was estimated from the same values of bulk densities used in measuring the in situ unsaturated hydraulic conductivity by using the calibrated Gardner model. A coefficient of determination (R2) = 0.997 was obtained when the estimated unsaturated hydraulic conductivity values against the ones measured in the field, were plotted indicating that easily measured soil characteristics such as bulk density for a particular soil, can be used to estimate hydraulic conductivity of that particular soil.
dc.description.sponsorshipThe Canadian Training Fund for Tanzanian Women (CTFTW)
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/20.500.14820/7159
dc.language.isoen
dc.publisherSokoine University of Agriculture
dc.subjectSandy clay loam soil
dc.subjectBulk density data
dc.subjectUnsaturated hydraulic conductivity
dc.titleEstimating unsaturated hydraulic conductivity of a sandy clay loam soil from Bulk density data
dc.typeThesis

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