Development of measurement of soil hydraulic properties by using in situ permeability tests data

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Recently, the demand for deep underground excavation and the development and utilization of its resources has increased. This raises a need to predict the behavior of the groundwater in multilayered aquifers in order to promote its conservation. The exact determination of hydraulic properties of each aquifers is very important for the correct groundwater flow prediction. Pumping tests are usually performed under the multilayered or leaky aquifer conditions. It is, however, difficult to analyze the data obtained from the pumping test under these conditions "analytically".In this research, a new method of estimating aquifer coefficients from pumping test data in a complicated aquifer conditions is proposed. The soil hydraulic properties, coefficient of permeability and storage are essential data to predict the behavior of groundwater. Pumping tests are usually performed to determine these properties. In this paper, a new approach to evaluate soil hydraulic properties from drawdown curves which are obtained by pumping tests has been developed. In our developed method the pattern-matching capability of a neural network is used. The neural network is trained to recognize patterns of drawdown data as input and corresponding hydraulic properties in the confined aquifer as output. The trained network produces output of hydraulic properties when it receives pumping test data as the input patterns. Drawdown data which are observed in a leaky aquifer or an anisotropic confined aquifer are used to evaluate availability of our proposed method.