Driftwood deposition from debris flows at slit-check dams and fans

被引：55

作者：

Shrestha, Badri Bhakta ^{[1
]}

Nakagawa, Hajime ^{[1
]}

Kawaike, Kenji ^{[1
]}

Baba, Yasuyuki ^{[1
]}

Zhang, Hao ^{[1
]}

机构：

[1] Kyoto Univ, Disaster Prevent Res Inst, Kyoto, Japan

来源：

NATURAL HAZARDS | 2012年 / 61卷 / 02期

关键词：

Debris flow; Large woody debris; Fan deposition; Slit-check dam; Trapping process; SIMULATION; TRANSPORT;

D O I：

10.1007/s11069-011-9939-9

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Experience shows that debris flows containing large woody debris (driftwood) can be more damaging than debris flows without driftwood. In this study, the deposition process of debris flows carrying driftwood was investigated using numerical simulations and flume experiments. Debris-flow trapping due to driftwood jamming in a slit-check dam was also investigated. A numerical model was developed with an interacting combination of Eulerian expression of the debris flow and Lagrangian expression of the driftwood, in which the fluctuating coordinates and rotation of the driftwood were treated stochastically. The calculated shapes and thicknesses of a debris-flow fan and the positions and orientations of the deposited driftwood on a debris-flow fan were consistent with experimental flume results. The jamming of driftwood in a slit-check dam was evaluated based on geometry and probability. The simulated results of outflow discharge and the proportion of driftwood passed through the slit-check dam also agreed with the experimental results.

引用

页码：577 / 602

页数：26