Breaching parameters of landslide dams |
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| Authors: | M Peng L M Zhang |
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| Institution: | (1) Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, HKSAR, Hong Kong, China;(2) Affiliated Researcher, State Key Laboratory of Geohazards and Environment, Chengdu University of Technology, Chengdu, China |
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| Abstract: | Landslide dams pose enormous risks to the public because of the potentially catastrophic floods generated by breaching of
such dams. The need to better understand the threats of landslide dams raises questions about the proper estimation of breaching
parameters (breach size, breaching duration, and peak outflow rate) of landslide dams and the feasibility of applying models
for estimating the breaching parameters of man-made earthen dams to landslide dams. This paper aims to answer these two questions.
In this study, a database of 1,239 landslide dams, including 257 cases formed during the 12 May 2008 Wenchuan earthquake,
has been compiled. Based on records of 52 landslide dam cases with breaching information in the database, empirical models
for estimating the breaching parameters of landslide dams are developed. A comparison study between landslide dams and man-made
earth and rockfill dams is conducted, which shows that the models for man-made earth and rockfill dams are not suitable for
estimating the breaching parameters of landslide dams. Two case studies are presented to show the application of the set of
empirical models developed in this paper. |
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