International Center for Interdisciplinary and Advanced Research (ICIAR) Indonesian Institute of Sciences (LIPI) Vegetation and landslide mechanism Dr. Heru Santoso Executive Secretary ICIAR-LIPI Research Scientist @ RC for Geotechnology, LIPI PEDRR Workshop on Ecosystems, Livelihoods and Disaster Risk Reduction Bonn, Germany, 21-23 September 2010 mechanism 1
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
International Center for Interdisciplinary and Advanced
Research (ICIAR)
Indonesian Institute of Sciences (LIPI)
Vegetation and landslide mechanism
Dr. Heru SantosoExecutive Secretary ICIAR-LIPI
Research Scientist @ RC for Geotechnology, LIPI
PEDRR Workshop on Ecosystems, Livelihoods and Disaster Risk Reduction
Bonn, Germany, 21-23 September 2010
mechanism
1
Outline
• Background: landslides in Indonesia
• Water as a destabilizing factor
• Acting forces in landslides and safety factor
• Role of vegetation• Role of vegetation
• DRR, and relevant methods and tools
• Closures
2
Landslides in IndonesiaLandslide susceptibility map of Indonesia
• There are many uncertain factors acting in the system due to heterogeneous of soil property, effect of vegetation, etc.
∑∑
=failure causing
failure preventing
F
FFS
of vegetation, etc.
• FS gives sense of probability of failure (risk/ susceptibility to fail), a simplification of complex uncertainty
• FS is commonly used in engineering design (risk vs. cost)
8
Role of vegetation
• Roots provide additional shear strength (better “actual” FS)
– Vegetation that have good soil anchoring (high IRA) and soil binding (high IRB) properties give best combined root stabilizing effectstabilizing effect
– Depend on vegetation species, age and local condition
– Only affect soil property at root depth
• Large or heavy trees could give additional weight to the landslide mechanism