Measurement of in situ saturated hydraulic conductivity in arid land and evaluation of measurement accuracy using numerical simulation
2002
Hamano, H. (Seikei Univ., Musashino, Tokyo (Japan)) | Tahara, K. | Kojima, T. | Yamada, K.
A lot of investigations of in-situ measurement methods for saturated hydraulic conductivity for farmland and their comparison have so far been conducted, while few for arid land. Furthermore, few of them consider the measurement and analytical errors in comparing these methods. In the present study, Leonora in Western Australia was selected as a research subject area, and quantitative evaluation was conducted for the effects of measurement condition on the results by various measurement and analytical methods, by comparison with results from numerical simulation. We also evaluated the impermeable layer on the results by Guelph permeameter method and permeability of crust from cylinder intake rate method. As a result, it was showed that the amount of infiltrated water was decreased about 10% by the existence of the impermeable layer at 46cm depth in the Guelph permeameter method. The value of the hydraulic conductivity of the crust layer formed at the soil surface was three-order lower than that of soil body. The Quantitative analysis of deviations and errors caused by various non-uniformity of soil structure are possible by comparison of multiple measurement results with numerical predictions.
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