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Lahar flood risk assessment in opak watershed, Yogyakarta. hal. 118-132
The Primary hazard of Merapi volcano eruption in 2010 has become extinct. However, the secondary hazard still expected to occur. The secondary hazard is lahar flood, which trigered by heavy rainfall in the upper slope of Merapi volcano. The aim of this research is, to assess the risk of lahar flood to the population in Opak watershed using three parameters of risk, hazard, vulnerability, and cooping capacity. Models are used in predicting the hazard area, whith lahar volume scenarios using LAHARZ software. Population density is used as an indicator of vulnerability and people's preparedness as basic for determining coping capacity. The most extensive area which impacted by lahar flood in Opak watersheed, based on lahar volume scenario is 1240
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