STUDY ON THE CONFIGURATIONS OF DEBRIS-FLOW FANS — IJEGE
 
 
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STUDY ON THE CONFIGURATIONS OF DEBRIS-FLOW FANS



Abstract:
Studies on debris-flow fan configurations are fundamental to map hazard zone of debris flow disasters. This study aims to identify the morphological similarity of debris-flow fans based on a series of laboratory experiments and field investigations. The maximum length Lc, width Bm and thickness Zo of debris-flow fans are adopted as the characteristic parameters for analyzing the morphological similarity. The analysis demonstrates that the non-dimensional longitudinal and transverse profiles of debris-flow fans are described by Gaussian curves, while the non-dimensional plan form is closely fitted using a circular curve. By combining the three non-dimensional curves, the three-dimensional topography of debris-flow fans are easily obtained based on the parameters Lc, Bm and Zo. The volume V are simply related to these maximum values via V=αLcBmZo with an empirically determined shape parameter α. From the result of verification with a debris flow fan in Foncho Village, Nan-tou County of central Taiwan, it shows that the 3D topography function makes a good hazard zone mapping of debris flow. Furthermore, the parameter α is approximately 0.28 for a natural stony debris-flow fan.

Authors:
Y.F. Tsai - Department of Social and Regional Development, National Taipei University of Education, Taipei, Taiwan No.134, Sec. 2, Heping E. Rd., Da-an District, Taipei City 106, Taiwan
H.K. Tsai - Institute of Information Science, Academia Sinica, Taipei, Taiwan 28 Academia Road, Section 2, Nankang, Taipei 115, Taiwan
Y.L. Cheng - Department of Social and Regional Development, National Taipei University of Education, Taipei, Taiwan No.134, Sec. 2, Heping E. Rd., Da-an District, Taipei City 106, Taiwan
Keywords
Debris flow, debris-flow fan, morphological similarity.
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