HR: 0800h
AN: H41E-0828    [Abstracts]
TI: A Method to Estimate Hydraulic Conductivity From Bulk Geochemical Compositions
AU: * Lu, H
EM: seishei@eq.ccu.edu.tw
AF: Earth and Environmental Sciences, National Chung Cheng University, 168, University Road, Min-Hsiung, Chia-Yi, 621, Taiwan
AB: A method has been developed to estimate hydraulic conductivity in fine-grained unconsolidated aquifers. The method uses bulk geochemical compositions correlated with hydraulic conductivities measured by field pumping tests. The concept is based on a general rule that hydraulic conductivity is principally controlled by grain size distribution and particle shape, which relate to mineralogical composition. After the conversion from bulk chemical compositions to normative mineralogical assemblages using MINLITH algorithm, the hydraulic conductivity (K in cm/s) can be expressed as a linear logarithmic equation to earthy mineral content (E in weight percent): logK=-1.292-0.0581E. This equation should not be applied to aquifers composed of medium and coarser grain sizes due to interference from lithic fragments. In addition, this equation tends to overestimate hydraulic conductivity possibly because the effect of compaction is ignored in this study. To correlate more data from high-resolution profiling tests with sediment geochemical compositions may overcome the difficulty in overestimation.
DE: 1829 Groundwater hydrology
SC: Hydrology [H]
MN: 2007 Fall Meeting