Tsunami merupakan kejadian alam yang dipengaruhi oleh aktifitasyang terjadi di dasar laut seperti gempa laut, gunung berapimeletus, dantanah longsor di dasar laut. Indonesia yang berada pada kawasan “Pacific ring of fire” merupakan negara yang rawan akan bencana tsunami. Saat ini, BPPT telah mengembangkan beberapateknologi untuk mendeteksi tsunami, salah satunya dengan Indonesia Cable Base Tsunamimeter (Ina-CBT). Teknologi ini dapat mendeteksi tsunami dengan menggunakan sensor di Ocean Bottom Unit (OBU) yang terpasang di dasar laut dan kemudian OBU dapat mengirimkan sinyal melalui kabel di dasar laut ke stasiun di darat. Pada tahun 2020 ini, BPPT berencana akan melakukan pemasangan empat kabel laut Indonesia (Ina-CBT) di beberapa lokasi yang memiliki potensi tsunami yang cukup besar yaitu segment Labuan Bajo,segment Rokatenda, segment Ibu Kota Negara (IKN) dan segment Cilacap – Krui.Untuk mendukung kegiatan Ina-CBT, perlu dilakukan survei pemetaan dasar laut untuk mengetahui kondisi dasar laut agar didapatkan lokasi penempatan kabel laut yang tepat dan terhindar dari bahaya (hazard) baik pada saat penggelaran maupun untuk keperluan pemeliharaan kabel. Penelitian ini menjelaskan prosedur pelaksanaan survei pemetaan bawah laut untuk perencanaan sistem kabel laut Indonesia (Ina-CBT).Prosedur pelaksanaan survei meliputi lingkup pekerjaan survei, metode survei, wahana dan peralatan survei, proses data hasil survei, dan laporan hasil survei. Pengembangan prosedur survei yang tepat diperlukan untuk menghasilkan data yang berkualitas.
The Indonesian government has initiated a program for Ina Tsunami Early Warning System by the development of sea level monitoring systems including a Cable-Based Tsunameter. Seabed feature characterization is a critical part of the engineering design process as well as for the understanding of environmental impacts. This study aims to characterize the seabed morphology along the cable route plan at the Cilacap segment by analyzing the seafloor mapping and identifying of any existing hazards. A series of marine surveys for the data acquisition hydro-acoustic and geophysics was conducted by RV Baruna Jaya IV, in December 2020. The analysis and interpretation of seabed geomorphology were conducted using qualitative methods on four Blocks. Results indicate anthropogenic objects (debris, wreck, and scars), while the features of ripples, and pockmarks. Furthermore, sediment layers which are interpreted into four units from the top to bottom shows fine grained sediment towards the top. Finally, the hazard assessment denotes that there are three hazard categories (low, medium, and high), of which the highest category is located in the pockmark cluster (Block 4). The existing CBT cable route place is faced with geomorphological obstacles and environmental threats, so it’s recommended to change the route as far as 50meters.
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