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Abstrak :
ABSTRAK
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.

Abstrak :
Akibat erosi dan sedimentasi, Danau Limboto mengalami pendangkalan mencapai 4.000 hektar sejak 1932. Para ahli memperhitungkan Danau Limboto mungkin rata tanah pada tahun 2031. Program ‘Revitalisasi Danau Limboto’ telah dilakukan sejak 2017, salah satunya penerapan teknologi sabo yang diharapkan mampu menahan laju sedimentasi dan menyelamatkan danau. Kajian ini dilakukan untuk menghitung potensi erosi dan sedimentasi hulu Danau Limboto yang terdiri dari 12 Sub-DAS, dengan model WaTEM/SEDEM. Studi menghasilkan 2 (dua) keluaran yaitu besar potensi sedimentasi total dan masing-masing Sub-DAS, serta identifikasi sedimen zonasi sub-DAS. Berdasarkan parameter jenis tanah dan pemicu lain, 5 dari 20 Sub-DAS merupakan pembawa sedimen potensial terbesar ke Danau Limboto, yaitu Batulayar sebesar 193.662 m3, diikuti Biyonga Boluta yaitu 123.095 m3, Alo1 sebesar 120.273m3, Alo sebesar 115.204 m3, dan Molamahu sebesar 73.058 m3. Hasil permodelan dikalibrasi visual dengan data sekunder, yaitu data sedimen sungaisungai yang diperoleh dari JICA dan Balai Wilayah Sungai Sulawesi II. Hasil menunjukkan skor yang bervariasi tergantung jenis tanah, kemiringan tanah, tutupan lahan, serta parameter lainnya.