1. Aplikasi GIS dalam penaksiran risiko gelinciran tanah (LRA): Kajian kes bagi kawasan sekitar Bandaraya Kota Kinabalu, Sabah, Malaysia.
- Author
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Roslee, Rodeano, Jamaluddin, Tajul Anuar, and Talip, Mustapa Abd.
- Subjects
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LANDSLIDES , *GEOGRAPHIC information systems , *GEOLOGICAL mapping , *LANDSLIDE hazard analysis - Abstract
This paper introduces a landslide risk assessment (LRA) concept to develop a comprehensive model, which can benefit stakeholders and suited for local conditions. The first step was to develop a semi-quantitative database through extensive desk, field and laboratory studies, including compilation of secondary data. In addition, data from remote sensing studies, engineering geological mapping, characterisation of observed hazard parameters, and soil and rock testings were also included. The next step was to establish criteria for landslide hazard evaluation. Seven parameters were taken into account; i.e. geology, geodynamic features, slope conditions, hydrology/hydrogeology, landuse, engineering characteristics of soils, and engineering characteristics of rocks. All the parameters were compiled and analysed with the landslide distribution map (LDM) to generate a landslide hazard map (LHM). The LDM was based on landslide locations obtained from field studies and satellite image interpretation. The third step was a vulnerability survey (physical, social and environmental) and compilation of secondary data for elements at risk (population and property values) to produce the population map (PM) and property value map (PVM). Finally, the landslide risk map (LRiM) was produced by superimposing the LHM, PM and PVM. The LHM of Kota Kinabalu area suggests that 2.78% of the area can be categorised as having very low hazard, 14.1% as low hazard, 19.7% as medium hazard, 51.6% as high hazard, 11.3% as very high hazard and 0.4% as extremely high hazard. The LRiM indicates that 13.1% of the Kota Kinabalu area is in very low risk zone, 20.3% in low risk zone, 16.1% in medium risk zone, 17.5% in high risk zone, 23.1% in very high risk zone and 1.0% in extremely high risk zone. Areas with low degree of landslide hazards may not necessary will have low risk to landslides and vice-versa. This study shows the ability of the Geographic Information System approach as a powerful intergrative tool in handling semi-quantitative data in spatial LRA research. [ABSTRACT FROM AUTHOR]
- Published
- 2011