Affiliation: | (1) Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan;(2) Department of Civil Engineering, National Taiwan University, No.1, Sec. 4, Roosevelt Road, Taipei, Taiwan;(3) Department of Soil &; Water Conservation, National Chung Hsing University, 250 Kuo-kwang Road, 402 Taichung , Taiwan |