Numerical simulation of debris flows triggered from the Strug rock fall source area, W Slovenia
Numerical simulation of debris flows triggered from the Strug rock fall source area, W Slovenia
复制标题
斯洛文尼亚西部斯特鲁格落石源区引发的泥石流数值模拟
DOI：
10.5194/nhess-6-261-2006
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
M. Četina
中科院分区：
文献类型：
--
作者：
M. Mikoš;R. Fazarinc;B. Majes;R. Rajar;D. Žagar;M. Krzyk;Tomaž Hojnik;M. Četina
The Strug landslide was triggered in December 2001 as a rockslide, followed by a rock fall. In 2002, about 20 debris flows were registered in the Kose ˘ village; they were initiated in the Strug rock fall source area. They all flowed through the aligned Brusnik channel, which had been finished just before the first debris flow reached the village in April 2002. Debris flow events were rainfall-induced but also governed by the availability of rock fall debris in its zone of accumulation. After 2002 there was not enough material available for further debris flows to reach the village. Never- theless, a decision was reached to use mathematical model- ing to prepare a hazard map for the village for possible new debris flows. Using the hydrological data of the Brusnik wa- tershed and the rheological characteristics of the debris ma- terial, 5 different scenarios were defined with the debris flow volumes from 1000 m 3 to a maximum of 25 000 m 3 . Two mathematical models were used, a one-dimensional model DEBRIF-1D, and a two-dimensional commercially available model FLO-2D. Due to the lack of other field data, data ex- tracted from available professional films of debris flows in 2002 in the Kose˘ village were used for model calibration. The computational reach was put together from an 800-m long upstream reach and 380-m long regulated reach of the Brusnik channel through the village of Kose˘ Both mathe- matical models have proved that the aligned Brusnik channel can convey debris flows of the volume up to 15 000 m 3 . Un- der the most extreme scenario a debris flow with 25 000 m 3 would locally spill over the existing levees along the regu- lated Brusnik channel. For this reason, additional river en- gineering measures have been proposed, such as the raising of the levees and the construction of a right-hand side sedi- mentation area for debris flows at the downstream end of the regulated reach.
