Estimation of the Variation of Matric Suction with Respect to Depth in a Vertical Unsaturated Soil Trench Associated with Rainfall InfiltrationWon Taek Oh, Sai K. Vanapalli, Shunchao Qi and Zhong HanE3S Web Conf., 9 (2016) 15003DOI: https://doi.org/10.1051/e3sconf/20160915003