Abstract
The transportable volcanic materials of Mt. Marapi, which are deposited around the caldera, as a result from last eruption in November 2015, must be estimated as a first step to handle the lahar/ debris flow disaster. In this research, the method used to determine the amount of river-based transportable volcanic material distribution was offered. The LIDAR Satellite DEM and TRMM data from Global Precipitation Climatology Project (GPCP) have been used to estimate the deposited volcanic materials. Based on the GPCP data analysis, it was found that the rainfall pattern distribute into two area, which are 0.52 mm/ hr on west side and 0.61 mm/ hr on east side relative to the mountain summit. The deposited materials from Mt. Marapi 14 November 2015 eruption (volcanic boulders and lava) were located in the upstream of six prioritized watershed. The transportable volcanic material will predominantly flows to the South and North West direction. The potentially transported boulder and lava are around 80.33 % of the total erupted material that are deposited in the river upstream. Batang Kadurang Watershed has the highest transportable material of 1,905.18 m3. The results of study can be used as a rapid disaster countermeasure for lahar disaster mitigation.
Highlights
IntroductionMt. Marapi, located close to Padang city in West Sumatera, Indonesia, has long history of eruptions that were ever recorded [1]
The technique is explained in equation 1, as follows: eruption plume height (EPh) = (DCoE × tan(θToP)) − (Zlip − Zsta)
The deposited material site within the volcano vicinity is appropriate presented on Figure 3
Summary
Mt. Marapi, located close to Padang city in West Sumatera, Indonesia, has long history of eruptions that were ever recorded [1]. Marapi, located close to Padang city in West Sumatera, Indonesia, has long history of eruptions that were ever recorded [1] Instead of all these worrisome evidence, many people still choose to live in the mountain slope. The large amount of deposited materials on Mt. Marapi raises our research question on how the materials will be distributed into the watersheds within the mountain slope. The method used in this paper aims to be an optimum solution when no erupted material deposit measurement data is available. This research proposes a new method on using the global free availability satellite data for river-based transportable volcanic material distribution analysis
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