Aceh located in earthquake disaster-prone area because it is located between two tectonic plates and also surrounded by several active volcanos. When earthquakes shake, the building frequency (f) should not be equal to the natural soil frequency (fn) as it may cause the collapse of buildings. The purpose of this study is to determine dynamic seismic parameters value on the surface layers for forthcoming disaster mitigation. The object study for this research were Rahmatullah Lampuuk Mosque, Sultan Iskandar Muda Airport, Lambaro Bridge in Aceh Besar, TDMRC building, and Taman Sari. Soil samplings from the locations and data obtained from the BMKG such as earthquake center map, coordinates, magnitude, and earthquake depths were used in the study. The result of this research was Gmax value based on Richart method. Kramer method was also used for computing the fn parameters. Some static and dynamic calculation of design parameter result from Rahmatullah Lampuuk Mosque shows that with void ratio (e) = 0.92, the Gmax = 266 × 103 kg/ms2, Vs = 10.096 m/s and fn = 2.524 Hz. The comparison of fn and fstructure = 2.50 Hz which not equal to zero make the building were safe from collapse during previous earthquakes in Aceh.
Penelitian ini bertujuan untuk menganalisis perilaku banjir bandang akibat keruntuhan bendungan alam dengan melakukan simulasi permodelan keruntuhan bendungan. Metodologi penelitian meliputi analisis hidrologi berdasarkan hujan ekstrim pada tanggal kejadian sebesar 125 mm yang menghasilkan debit puncak banjir sebesar 334,83 m 3 /dt. Analisis hidraulika dilakukan terhadap geometrik sungai, bendungan alam dengan pendekatan topografi dan mengestimasi koefisien kekasaran manning. Simulasi pemodelan banjir bandang akibat keruntuhan bendungan alam ini menggunakan software HEC-RAS 4.1.0 yang diakibatkan oleh overtopping dan piping. Berdasarkan validasi elevasi banjir antara pemodelan dan observasi di lapangan, keruntuhan bendungan alam di Sungai Krueng Teungku akibat overtopping. Dari hasil simulasi diperoleh waktu tiba banjir dari hulu ke hilir adalah sebesar 1,104 jam. Volume pembendungan alam sebesar 13.110,32 m 3 yang menyebabkan ketinggian genangan banjir di hilir antara 1 sampai 2 meter. Kejadian ini menimbulkan kerugian di wilayah pemukiman, perkebunan masyarakat dan tambak. Dengan adanya informasi perilaku banjir bandang ini berguna untuk meningkatkan kapasitas untuk meminimalisir dampak bencana banjir bandang.
Introduction: Process-based river hydrology and morphological analyses are infrequent, especially in developing countries. Climate change and the expected occurrence of major floods and erosion that could threaten the safety of nearby and downstream settlements, especially in areas that are very sensitive and affected by global warming, have made this kind of investigation necessary. Methods: The watershed of the River Krueng Buloh is prone to severe flooding, which has many social and economic effects on the villages nearby, such as the loss of crops and the destruction of buildings. However, the hydro-morphology and fluctuation of this river have not yet been studied. This research aims to determine which factors influence the stability of a river channel in the downstream region of the Krueng Buloh watershed following flooding or erosion. Results: To achieve this objective, field, and satellite-based observations of the hydro-morphology of a Krueng Buloh watershed have been performed. The investigation reveals that floods and sediment accumulation in the floodplain were triggered by excessive rainfall, the meandering of the river, and the riverbank soil type. Conclusion: The conclusions and methods given can be used to evaluate flooding and sedimentation in rivers for future operations to protect and preserve rivers.
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