Prediction of Floods Caused by Landslide Dam Collapse

被引：18

作者：

Satofuka, Yoshifumi ^{[1
]}

Mori, Toshio ^{[2
]}

Mizuyama, Takahisa ^{[3
]}

Ogawa, Kiichiro ^{[4
]}

Yoshino, Kousuke ^{[5
]}

机构：

[1] Ritsumeikan Univ, Dept Civil Engn, Coll Sci & Engn, Noji Higashi 1-1-1, Kusatsu, Shiga 5258577, Japan

[2] Sabo Frontier Fdn, Chiyoda Ku, Tokyo 1020093, Japan

[3] Kyoto Univ, Grad Sch Agr, Sakyo Ku, Kyoto 6068502, Japan

[4] Asia Air Survey Co Ltd, Asao Ku, Kawasaki, Kanagawa 2140004, Japan

[5] Asia Air Survey Co Ltd, Inc Adm Agcy, Publ Works Res Inst, Tsukuba, Ibaraki 3058516, Japan

来源：

JOURNAL OF DISASTER RESEARCH | 2010年 / 5卷 / 03期

关键词：

landslide dam; outburst; flood discharge prediction; two-layer model; river bed variation;

D O I：

10.20965/jdr.2010.p0288

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Landslide dam formation and deformation strongly affect water and sediment runoff. When a large-scale landslide dam collapses due to overflow erosion, peak flood discharge may exceed inflow discharge by several times. Such an abrupt flow discharge increase by a dam burst may cause serious damage downstream. We propose a one-dimensional model for river-bed variation and flood runoff consisting of a two-layer model for immature debris flow and a bank erosion model. We applied this model to the Nonoo landslide dam in Japan's Miyazaki Prefecture, formed by typhoon Nabi in September 2005, and China's Tangji-ashan landslide dam formed in the Wenchuan earthquake in May 2008. The model reproduces the observed flood runoff processes in the two areas. Calculated results suggest that peak flood discharge diminishes when water accumulating behind the landslide dam is small, and excavating the landslide dam crown effectively reduces flood discharge.

引用

页码：288 / 295

页数：8

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