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Analysing changes in landslide vulnerability using GIS and local spatial knowledge

Babirye, Geraldine Paula (2010) Analysing changes in landslide vulnerability using GIS and local spatial knowledge.

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Abstract:The aim of the research was to investigate people’s vulnerability and perceptions to landslides. Information from respondents was gathered by use of questionnaires from two villages in Banjarmangu district, Central Java province, Indonesia. These two villages were randomly sampled to get a feel of the different views from different people. Some elements related to the physical and socio-economic aspects of the respondents in the two villages were identified and analyzed using some indicators. These indicators were used in relation to the ability of people to deal with the different landslide processes. The availability of both formal and informal mechanisms such as social networks and warning systems (Kentogan) that play an important role in coping with and adapting to the hazard were also explored. Data on the respondents’ perception to what landslides are, their causes, the available resources to preventing them and the existing measures for disaster management within the community are also discussed in this research. The weights of evidence modelling method that uses the prior probability of occurrence of an event was used to determine the probability of occurrence of landslides based on the relative contributions of factor themes that are influential in creating slope instability. A sensitivity analysis was carried out on the input factors to the weights of evidence modelling to determine their influence on the occurrence of the fast landslides and creep phenomena taking place in the study area. The results are landslide susceptibility zonation maps. A summary of the work, methodologies and tools employed by organizations and government agencies involved in various studies and investigations to understand what really happened after the tragic loss of 76 lives in the Gunungraja hamlet 2006 landslide is discussed in this work together with collective independent findings by the author. The overall vulnerability obtained from the research showed that both villages had comparable vulnerability classes with majority of the respondents with in the moderate class. A risk index matrix associated with the hazard and vulnerability of the investigated communities was constructed but is not the final result per se. The risk analysis results provided estimates for individual risk levels but did not provide insight on the geographical distribution of the landslide risk to the whole population in the study area. The ultimate objectives can only be fulfilled when proper risk reduction measures are implemented, leading to an observed decrease of casualties. Keywords: Hazard, Vulnerability, Perception, coping mechanisms and risk
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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