Slope Stability Assessment Using Trigger Parameters and SINMAP Methods on Tamblingan-Buyan Ancient Mountain Area in Buleleng Regency, Bali

The mapping of soil movement was examined by comparing an extension of the deterministic Soil Stability Index Mapping (SINMAP) method, and an overlay method with trigger parameters of soil movement. The SINMAP model used soil parameters in the form of the cohesion value (c), internal friction angle...

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Bibliographic Details
Published in:Geosciences (Basel) 2017-12, Vol.7 (4), p.110
Main Authors: Sinarta, I, Rifa’i, Ahmad, Faisal Fathani, Teuku, Wilopo, Wahyu
Format: Article
Language:English
Subjects:
Accuracy
ancient mountain area
Area
Earth science
Geological structures
Groundwater
Groundwater potential
hazard scale
Hazards
Hydraulic conductivity
Inclination
Internal friction
Landslides
Literature reviews
Mapping
Mathematical models
Methods
Model accuracy
Mountain regions
Parameters
Rain
Rainfall
Seismicity
SINMAP
Slope stability
Soil
Soil dynamics
Soil mapping
soil movement mapping
Soil stability
Soil water
Soil water movement
Soils
Stability analysis
trigger parameter
Water absorption
Weathering
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Summary:The mapping of soil movement was examined by comparing an extension of the deterministic Soil Stability Index Mapping (SINMAP) method, and an overlay method with trigger parameters of soil movement. The SINMAP model used soil parameters in the form of the cohesion value (c), internal friction angle (φ), and hydraulic conductivity (ks) for the prediction of soil movement based on the factor of safety (FS), while the indirect method used a literature review and field observations. The weightings of soil movement trigger parameters in assessments were based on natural physical aspects: (1) slope inclination = 30%; (2) rock weathering = 15%; (3) geological structure = 20%; (4) rainfall = 15%; (5) groundwater potential = 7%; (6) seismicity = 3%; and (7) vegetation = 10%. The research area was located in the Buleleng district, in particular in the ancient mountain area of Buyan-Tamblingan, in the Sukasada sub-district. The hazard mapping gave a high and very high hazard scale. The SINMAP model gave a validation accuracy of 14.29%, while the overlay method with seven trigger parameters produced an accuracy of 71.43%. Based on the analysis of the very high and high hazard class and the validation of the landslide occurrence points, the deterministic method using soil parameters and water absorption gave a much lower accuracy than the overlay method with a study of soil motion trigger parameters.
ISSN:2076-3263
2076-3263
DOI:10.3390/geosciences7040110