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Study on the selection of unsaturated flow model for the different types of soil and soft rock

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Abstract

Precise estimation of unsaturated hydraulic properties of porous media is indispensable in various study areas, such as analyzing the moisture flow, the drying process occurring from the surface, and the pollutant migration beneath the ground surface. Although many empirical/theoretical models describing the unsaturated hydraulic properties have been proposed by several previous researchers, the best model for the different types of soil/rock may not be identical. Thus, the model selection process and the estimation technique of the parameters included in the models should be developed. In the present study, the inverse technique based on the transient evaporation change was investigated to select the model and estimate the model parameters. The experimental work was based on a relatively low permeable soft rock and a relatively high permeable sandy soil (Toyoura standard sand). Experimental equipment was developed to precisely measure the evaporation rate for the high permeable sandy soil. The Genetic Algorithm (GA) was adopted in the inverse technique as an optimization tool. In order to simplify the problem, only the drying process from the saturated condition was considered. It was established that the information concerning the transient evaporation change could be used for the model selection and parameter estimation. Further, the saturation distribution could be used for the selection of the models. The present study provides important information for the development of the model selection process.

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Authors and Affiliations

  1. Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama, 338-8570, Japan

    Sajeewani Rajika Amarasinghe

  2. Geosphere Research Institute, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama, 338-8570, Japan

    Kunio Watanabe

  3. Nishimatsu Co-operation Research Institute, 1-20-10, Toranomon, Minato-ku, Tokyo, 105-8401, Japan

    Koji Ishiyama

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  1. Sajeewani Rajika Amarasinghe
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  2. Kunio Watanabe
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  3. Koji Ishiyama
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Correspondence to Sajeewani Rajika Amarasinghe.

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Amarasinghe, S.R., Watanabe, K. & Ishiyama, K. Study on the selection of unsaturated flow model for the different types of soil and soft rock. Environ Earth Sci 64, 1795–1805 (2011). https://doi.org/10.1007/s12665-011-0982-3

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  • DOI: https://doi.org/10.1007/s12665-011-0982-3

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