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14. Regional Assessment on the Influence of Land Use Related Factor on Landslide Occurrences in Kundasang, Sabha.

Author

Sharir, Kamilia, Simon, Norbert, and Roslee, Rodeano

Subjects
*LANDSLIDES, *GEOLOGICAL mapping, *EARTHQUAKES, *RESIDENTIAL areas, *LAND use mapping, *AERIAL photography
Abstract

Landslides are caused by human activities for development purposes. This study assesses the influence of land use factors on landslide occurrences in Kundasang, Sabah. This area is a well-known area that is prone to natural geohazards such as landslides and earthquake. Interpretation of aerial photographs was conducted to identify landslide distributions in three assessment years; 1984, 2009, and 2012. From the interpretation, a total of 494 landslides were identified. The land use maps for each year were produced from the same aerial photographs used for the landslide identification. The land use maps were later classified into four classes, namely, forest, barren, built up and agriculture area. Landslide density in each of the land use class was calculated and the initial finding showed that majority of landslides occurred in built up and barren classes especially in the 1984 and 2009 with 53 km2 and 50 km² respectively. These results indicate that land use activities influence landslide occurrences and some mitigation action must be taken to minimise the impact of landslide occurrences especially in the built up class where this area is mostly occupied by residential area. [ABSTRACT FROM AUTHOR]

Published
2016
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15. Physical Soil Characterization on Stable and Failed Slopes of the Ranau-Tambunan Road, Sabah, Malaysia.

Author

Simon, Norbert, Nor Azlan, Noran Nabilla, Roslee, Rodeano, Hussein, Azimah, Lee Khai Ern, and Sharir, Kamilia

Subjects
SOIL structure, SOIL stabilization, SLOPES (Soil mechanics), SOILS, MATERIAL plasticity
Abstract

this study, an initiative has been taken to characterize soil physical properties of stable and failed soil slopes along the Ranau-Tambunan road in Sabah. A total of 26 samples consisting of 10 samples from stable slopes and another 16 samples from failed soil slopes were collected. Basic physical soil tests that were performed were particle size distribution, liquid limit, plastic limit and plasticity index. The Mann-Whitney test was used to determine the association between landslides and the physical properties of both slope groups. In addition, mean rank of physical properties for both slope groups were also computed. Based on the test, the particle size distribution, liquid and plasticity index for both groups were indicated as significantly associated with landslides with p values of 0.0305, 0.009 and 0.040 respectively. The plastic limit (p=0.667), however, did not show significant association with landslide occurrences. In terms of mean rank, failed slopes have higher value than stable slopes for fine grain materials comprising of silt and clay (15.94 vs 9.60), liquid limit (16.50 vs 8.70), plastic limit (14.03 vs 12.65) and plasticity index (16.69 vs 8.40). [ABSTRACT FROM AUTHOR]

Published
2017

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