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Ardian Alfianto
Balai Litbang Sabo
Civil Engineering, Building, Construction & Architecture Engineering

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Efektivitas Dan Kelengkapan Bangunan Sabo Di Sungai Togurara Daerah Gunungapi Gamalama Ardian Alfianto; Jati Iswardoyo; cosmas bambang sukatja
JURNAL TEKNIK HIDRAULIK Vol 10, No 2 (2019): JURNAL TEKNIK HIDRAULIK
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v10i2.608

Abstract

The lahar flow  that occurred after the 2012  Gamalama Volcano  eruption, leading to the eastern valley flowing downstream  through the Togurara River to the center of Ternate City and Sultan Babullah Airport. To overcome the potential of  lahar  flow in the river since 2013 - 2016, several sabo dams and building facilities have been built. Based on the results of the calculation of deposits that potentially become lahar flows in 2016, the built-in capacity of the Sabodam has not been able to control the volume of sediment in the upstream of the river, then in the year 2017, 2018 constructed several additional Sabodam.  In order to determine the effectiveness, feasibility and conditions of the completeness of Sabodam, is done field assessment on 25 ~ 27 September 2018, the method used was a mathematical approach based on sabo technology. The assessment was in the form of a field survey, simple measurements, interviews with the Sabodam management agency and local residents related to the lahar flow that had occurred. With the capacity of several additional Sabodams built in series, the average river bed slope was originally 9.09% to 6.83%. After the construction of Sabodam, the maximum lahar flow was once as high as 7 m, but now it decreases do 4.2 m.   As the slope of the Togurara River slopes progressively, the lahar flow rate and its destructive power are reduced, so that Ternate City and Sultan Babullah Airport are spared from lahar disaster.Keywords: Lahar flow, sabodam, sabo technology, slope of riverbed, Togurara River.
Revitalisasi Sabodam Sebagai Pengendali Aliran Lahar (Studi Kasus Di Daerah Gunungapi Merapi) Cosmas Bambang Sukatja; Ardian Alfianto
JURNAL TEKNIK HIDRAULIK Vol 8, No 1 (2017): JURNAL TEKNIK HIDRAULIK
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1411.021 KB) | DOI: 10.32679/jth.v8i1.239

Abstract

Mega-eruption of Merapi Volcano 2010 is a large-scale explosive eruption, destroying lava dome, removing cloud columns as high as 4 kilometers and bursts of in various directions at the volcano foot. Approximately 140 millions m3 of pyroclastic material spread through the 13 major rivers that source from Merapi. Lahar flow occurred in almost every river basin located beneath the active cone of Merapi. As a result of the lahar flow, as many as 77 of the 264 units of the sabo dam in the Merapi area were damaged or washed away by the lahar flows. The sabo dam controls the flow of lahar built up across the river channel to hold, accommodate and drain some of the material or sediment in order to carry the flow and pass water downstream. This study was conducted to find the cause of sabo dam damage, and the right solution after the eruption of Merapi 2010. The method used in qualitative descriptive approach. The results of this study were to revitalize sabo dam as lahar flow controller and as a reference in reviewing the master plan of a lahar flow control system in other volcanic areas.
Co-Authors Cosmas Bambang Sukatja cosmas bambang sukatja Jati Iswardoyo