scholarly journals Simulasi Penjalaran Gelombang Tsunami di Sofifi– Tidore Kepulauan Maluku Utara sebagai Upaya Mitigasi Bencana

Jurnal MIPA ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 83
Author(s):  
Mellisa Inggried Sumtaki ◽  
Guntur Pasau ◽  
Seni H.J. Tongkukut
Keyword(s):  
Arrival Time ◽  
Tsunami Wave ◽  
Time Lapse ◽  
Wave Transmission ◽  
Minimum Time ◽  
Tsunami Source ◽  
Seafloor Deformation

Telah dilakukan simulasi penjalaran gelombang tsunami di Sofifi – Tidore Kepulauan Maluku Utara untuk mengetahui waktu tiba dan tinggi gelombang tsunami yang menerjang pantai apabila gempa yang diikuti tsunami kembali terjadi. Simulasi menggunakan perangkat lunak WinITDB dengan memasukkan koordinat sumber tsunami, koordinat daerah yang akan diterjang tsunami, panjang patahan, lebar patahan dan deformasi dasar laut dari data gempa yang pernah menimbulkan tsunami. Hasil simulasi menunjukkan bahwa daerah Sofifi termasuk dalam klasifikasi tsunami yang cukup berbahaya dengan tinggi gelombang 0,5 m ≤ H ≤ 1,5 m dan waktu minimum gelombang tsunami mencapai pantai adalah 36 menit.A simulation of tsunami wave transmission in Sofifi – Tidore archipelago, North Maluku has been done to know the arrival time and the height of tsunami wave that hits the coast if an earthquake that followed by tsunami reoccurs. The simulation is carried out using software WinITDB by inputting the coordinate of tsunami source, coordinate of the region that will be hit by the tsunami, the length and the width of the fracture, and the seafloor deformation from the data of earthquakes that ever triggered tsunamis. The result shows that Sofifi region is classified as fairly-dangerous with tsunami waveheight of 0,5m ≤ H ≤ 1,5m and minimum time lapse for the tsunami wave to reach the coast is 36 minutes.

scholarly journals Simulasi Penjalaran Gelombang Tsunami di Pesisir Pantai Utara Pulau Halmahera

Jurnal MIPA ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 63
Author(s):  
Fanya Sangkoy ◽  
Guntur Pasau ◽  
Gerald Tamuntuan
Keyword(s):  
Research Method ◽  
Arrival Time ◽  
Tsunami Wave ◽  
North Coast ◽  
Maximum Height ◽  
Tectonic Earthquake ◽  
The North ◽  
Seafloor Deformation ◽  
Earthquake Data ◽  
North Latitude

Telah dilakukan simulasi penjalaran gelombang tsunami di pesisir pantai utara pulau Halmahera. Lokasi penelitian berada pada kooordinat   -  LU dan -  BT. Metode penelitian meliputi: mengumpulkan data gempa tektonik dari NOAA, melakukan perhitungan panjang patahan, lebar patahan, dan deformasi dasar laut, melakukan simulasi dengan software WinITDB. Hasil simulasi dalam bentuk grafik tinggi gelombang dan waktu tiba gelombang tsunami. Dari hasil simulasi yang telah dilakukan, salah satu wilayah yang masuk dalam klasifikasi sangat berbahaya adalah Wayamli karena tinggi maksimum gelombang tsunami 3 m.A simulation of tsunami wave transmission on the north coast of Halmahera Island has been done. The research coordiantes are at -  north latitude and -  east longitude. Research method covers these: collecting tectonic earthquake data from NOAA, calculating the length and width of the fracture and the seafloor deformation, and carrying the simulation out using winTDB software. The simulation result is presented in the form of maximum height graph and arrival time of tsunami wave. According to the simulation’s result that has been done, one of the regions that classified as highly-dangerous is Wayamli, since its maximum waveheight is 3 m

scholarly journals The Tsunami Simulation Generated by ‘Anak Krakatau’ Volcano Flank Collapse using MIKE 21Hydrodynamics Flexible Mesh with Manning Number Variation

2021 ◽  
Vol 5 (1) ◽  
pp. 445-450
Author(s):  
Hanah Khoirunnisa ◽  
Wahyu Hendriyono ◽  
Mardi Wibowo
Keyword(s):  
Water Depth ◽  
Spatial Data ◽  
Arrival Time ◽  
Tsunami Wave ◽  
Propagation Speed ◽  
Tsunami Source ◽  
Tsunami Simulation ◽  
Simulation Domain ◽  
Number Variation ◽  
Krakatau Volcano

This study aims to calculate the tsunami investment and the estimated arrival time at several locations around the Sunda strait, caused by the December 2018 Krakatao's eruption. The propagation of the tsunami wave is simulated using MIKE 21 Hydrodynamics Flexible Mesh (HD FM). The spatial data consist of the bathymetry and topography of the Sunda Strait area and its surroundings, whilst assumptions are made on the tsunami source topology and its exact location. Several runs of the simulation are then conducted by varying the Manning Number, i.e. bed resistance values, at the tsunami source and throughout the simulation domain, which accordingly would influence the propagation speed, inundation, and arrival time. Smaller Manning's values, which correspond to increasing roughness, are applied at locations closer to the tsunami source. In this simulation, Manning's number ranges from 10 to 40 m1/3s-1. Surface elevation, still water depth, and u and v velocity components are generated from this simulation.

scholarly journals Simulasi Penjalaran Tsunami Di Beberapa Pantai Di Sulawesi Utara Sebagai Upaya Mitigasi Bencana

Jurnal MIPA ◽  
2015 ◽  
Vol 4 (2) ◽  
pp. 103
Author(s):  
Fhandy Pandey ◽  
Guntur Pasau ◽  
Seni H. J. Tongkukut
Keyword(s):  
Arrival Time ◽  
Tsunami Wave ◽  
Tsunami Source ◽  
Impact Zone ◽  
Zone Length ◽  
Fracture Width ◽  
Sea Floor ◽  
The North ◽  
North Sulawesi ◽  
Northern Shore

Daerah pantai utara wilayah Sulawesi Utara merupakan kawasan pesisir yang memiliki kepadatan penduduk cukup besar. Sebelah utara laut Sulawesi atau selatan Filipina berdasarkan data NOAA pernah mengalami 5 kejadian tsunami akibat gempabumi. Gempabumi yang menimbulkan tsunami ini berpotensi terulang kembali pada waktu yang akan datang. Penelitian ini bertujuan mengsimulasikan kejadian tsunami untuk mengetahui waktu tiba dan tinggi gelombang tsunami jika gempabumi tersebut kembali terjadi. Simulasi dilakukan dengan memakai software WinITDB. Jika koordinat sumber tsunami, koordinat daerah yang akan diterjang tsunami, panjang patahan, lebar patahan, deformasi dasar laut diketahui maka waktu tiba gelombang tsunami dan tinggi gelombang tsunami dapat diketahui. Dihasilkan bahwa pantai Kaidipang, Bintauna, Lolak, Poigar, Amurang, Tombariri, Manado, Siau Barat dan Tahuna termasuk dalam klasifikasi tsunami sangat berbahaya dengan tinggi H  ≥ 3 meter. Satu-satunya pantai yang termasuk dalam klasifikasi tsunami hanya bahaya yaitu  pantai Beo dengan tinggi 2,3 meter.The northern shore of North Sulawesi is a coastal area with high population density. The north of Sulawesi Sea or the South Philippines Sea, according to NOAA’s data experienced 5 tsunamis caused by earthquake. This earthquake has the potential to occur again in the future. The purpose of this study is to simulate tsunami in order to be able to predict its arrival time and the height of the tsunami wave when the earthquake happens. The simulation was performed using WinITDB software. If the coordinates of the tsunami source, impact zone, length of fracture, width of fracture, and sea floor deformation are known, the arrival time and the wave height of the tsunami can be determined. It is found that Kaidipang seashore, Bintauna, Lolak, Poigar, Amurang, Tombariri, Manado, West Siau and Tahuna are classified as dangerous tsunami zones with potential heights of H > 3. The only seashore that is classified as tsunami hazard is in the height of 1,5 < H < 3.

Engineering lessons from the 28 September 2018 Indonesian tsunami: debris loading

2020 ◽  
Vol 47 (1) ◽  
pp. 1-12 ◽  
Author(s):  
J. Stolle ◽  
C. Krautwald ◽  
I. Robertson ◽  
H. Achiari ◽  
T. Mikami ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Local Community ◽  
Field Survey ◽  
Tsunami Wave ◽  
Concrete Structures ◽  
Tsunami Source ◽  
Reinforced Concrete Structures ◽  
Research Gaps ◽  
Survey Team ◽  
Source Mechanisms

A field survey team went to Palu City, Indonesia in the aftermath of the September 28th, 2018 earthquake and tsunami to investigate its effects on local infrastructure and buildings. The study focused on the coast of Palu Bay, where a tsunami wave between approximately 2 and 7 m high impacted the local community as a result of several complex tsunami source mechanisms. The following study outlines the results, focused on loading caused by debris entrained within the inundating flow. Damage to timber buildings along the coast was widespread, though reinforced concrete structures for the most part survived, providing valuable insights into the type of debris loads and their effects on structures. The results of this survey are placed within the context of Canadian tsunami engineering challenges and are compared to the recently-released ASCE 7 Chapter 6 – Tsunami Loads and Effects, detailing potential research gaps and needs.

scholarly journals A numerical study of tsunami wave impact and run-up on coastal cliffs using a CIP-based model

2017 ◽  
Vol 17 (5) ◽  
pp. 641-655 ◽  
Author(s):  
Xizeng Zhao ◽  
Yong Chen ◽  
Zhenhua Huang ◽  
Zijun Hu ◽  
Yangyang Gao
Keyword(s):  
Incident Wave ◽  
Tsunami Wave ◽  
Critical Value ◽  
Tsunami Source ◽  
Solid Boundary ◽  
Wave Impact ◽  
Submarine Slope ◽  
Coastal Cliffs ◽  
Run Up ◽  
The Impact

Abstract. There is a general lack of understanding of tsunami wave interaction with complex geographies, especially the process of inundation. Numerical simulations are performed to understand the effects of several factors on tsunami wave impact and run-up in the presence of gentle submarine slopes and coastal cliffs, using an in-house code, a constrained interpolation profile (CIP)-based model. The model employs a high-order finite difference method, the CIP method, as the flow solver; utilizes a VOF-type method, the tangent of hyperbola for interface capturing/slope weighting (THINC/SW) scheme, to capture the free surface; and treats the solid boundary by an immersed boundary method. A series of incident waves are arranged to interact with varying coastal geographies. Numerical results are compared with experimental data and good agreement is obtained. The influences of gentle submarine slope, coastal cliff and incident wave height are discussed. It is found that the tsunami amplification factor varying with incident wave is affected by gradient of cliff slope, and the critical value is about 45°. The run-up on a toe-erosion cliff is smaller than that on a normal cliff. The run-up is also related to the length of a gentle submarine slope with a critical value of about 2.292 m in the present model for most cases. The impact pressure on the cliff is extremely large and concentrated, and the backflow effect is non-negligible. Results of our work are highly precise and helpful in inverting tsunami source and forecasting disaster.

scholarly journals Study on Analytical Modelling of Tsunami Wave Propagation

2020 ◽  
Author(s):  
Yasmin Regina M ◽  
Syed Mohamed E
Keyword(s):  
Wave Propagation ◽  
Arrival Time ◽  
Tsunami Wave ◽  
Wave Train ◽  
Deep Ocean ◽  
Vital Role ◽  
The People ◽  
Run Up ◽  
Short Time ◽  
Tsunami Amplitude

Modelling of tsunami wave propagation plays a vital role in forecasting of disastrous tsunami. The earlier identification and prediction of tsunami provides more time for taking preventive measures and evacuation. On December 26, 2004, massive destruction of lives and properties due to tsunami increases the needs to develop a fast and accurate modelling of tsunami wave propagation. The modelling of waves provide the amplitude of tsunami, speed, arrival time and power of the wall of water and also run up distance and height. It also used to predict vulnerable buildings to tsunami. In this paper describes the modelling of tsunami wave propagation from generation to run-up. Numerical and analytical methods used for modelling and simulation. Tsunami is serious of wave (wave train) which has a long wavelength >500 km and celerity of wave more than 800 km/hr in deep ocean and in shallow coast, their wavelength and celerity diminishes but the amplitude of wave increases above 30m. The scope of this study is to determine the areas which are going to hit by tsunami, amplitude of wave and their arrival time for early forecasting and alert the people within a short time after an earthquake happened.

scholarly journals Analysis of the tsunami amplification effect by resonance in Yeongil Bay

2021 ◽  
Vol 8 (4) ◽  
pp. 315-322
Author(s):  
Eunju Lee ◽  
Sungwon Shin
Keyword(s):  
Numerical Modeling ◽  
South Korea ◽  
East Coast ◽  
Tsunami Wave ◽  
Tide Gauge ◽  
Warning System ◽  
Tsunami Source ◽  
Tsunami Forecast ◽  
Tsunami Wave Height ◽  
Tsunami Model

Predicting tsunami hazards based on the tsunami source, propagation, runup patterns is critical to protect humans and property. Potential tsunami zone, as well as the historical tsunamis in 1983 and 1993, can be a threat to the east coast of South Korea. The Korea Meteorological Administration established a tsunami forecast warning system to reduce damage from tsunamis, but it does not consider tsunami amplification in the bay due to resonance. In this study, the Numerical model, Cornell Multi-grid Coupled Tsunami model, was used to investigate natural frequency in the bay due to coastal geometry. The study area is Yeongill bay in Pohang, southeast of South Korea, because this area is a natural bay and includes three harbors where resonance significantly occurs. This study generated a Gaussian-shaped tsunami, propagated it into the Yeongill bay, and compared numerical modeling results with data from tide gauge located in Yeongill bay during several storms through spectral analysis. It was found that both energies of tsunamis and storms were amplified at the same frequencies, and maximum tsunami wave height was amplified about 3.12 times. The results in this study can contribute to quantifying the amplification of tsunami heights in the bay.

scholarly journals Hardware Acceleration of Tsunami Wave Propagation Modeling in the Southern Part of Japan

2020 ◽  
Vol 10 (12) ◽  
pp. 4159
Author(s):  
Mikhail Lavrentiev ◽  
Konstantin Lysakov ◽  
Andrey Marchuk ◽  
Konstantin Oblaukhov ◽  
Mikhail Shadrin
Keyword(s):  
Wave Propagation ◽  
Tsunami Wave ◽  
Water System ◽  
Hardware Acceleration ◽  
Tsunami Source ◽  
Propagation Modeling ◽  
Field Programmable ◽  
Shallow Water System ◽  
Industrial Unit ◽  
Wave Propagation Modeling

In order to speed up the calculation of tsunami wave propagation, the field-programmable gate array (FPGA) microchip is used. This makes it possible to achieve valuable performance gain with a modern regular personal computer. The two half-step MacCormack scheme was used herein for numerical approximation of the shallow water system. We studied the distribution of tsunami wave maximal heights along the coast of the southern part of Japan. In particular, the dependence of wave maximal heights on the particular tsunami source location was investigated. Synthetic 100 × 200 km sources have realistic parameters corresponding to this region. As observed numerically, only selected parts of the entire coast line are subject to dangerous tsunami wave amplitudes. The particular locations of such areas strongly depend on the location of the tsunami source. However, the extreme tsunami heights in some of those areas can be attributed to local bathymetry. The proposed hardware acceleration to compute tsunami wave propagation can be used for rapid (say, in a few minutes) tsunami wave danger evaluation for a particular village or industrial unit on the coast.

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