Study on huge sediment disasters triggered by volcanic eruption and earthquake in the Merapi volcano area of the central Java

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We have investigated the actual situation of huge sediment disasters triggered by volcanic eruption and earthquake in the Merapi volcano area of the central Java and discussed the issues of sediment resources related to sediment disaster events. The data on sediment movement after the eruption in 2006, landslides by the earthquake in 2006, land cover condition change and sand mining activity have been collected. Employing a bed variation model, we have shown some ideas for sediment management based on sabo works, channel works and sand mining regulation evaluating the effects on sediment disaster reduction, sediment utilization and river environment conservation from a socio-economic point of view.