Diversion capacity of capillary barriers on curved boundary slopes
2004
Kojima, M. (Tokyo Univ. (Japan)) | Miyazaki, T.
This paper focuses on measuring and estimating diversion lengths of capillary barriers. Under unsaturated conditions, fine overlying coarse soils cause a capillary barrier along their contacts. Diversion capacity of capillary barriers has been attracting great interest when, for example, they are applied to divert water away from contaminated subsoil regions. The diversion lengths on flat boundary slopes have been estimated based on several models. But few laboratory experiments measuring diversion lengths have been conducted. And no study tries to measure and estimate the diversion lengths on curved boundary slopes. In this study diversion lengths on flat boundary slopes are measured and compared with estimated diversion lengths. The results show that the model by Steenhuis estimate diversion lengths well. This means water entry value is important to know capillary barrier phenomena. Then capillary diversion lengths on curved slopes are measured and estimated by the way newly suggested in this study. The estimated diversion lengths on curved boundary slopes were in good agreements with measured diversion lengths.
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