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Numerical simulation for estimating of sediment transport due layouts of port

AIP Conference Proceedings 2017年第1期1892卷

作者： Sri Hartuti Nengsih Fachrurrazi Syamsidik Shigeru Kato 1Tsunami Computation and Visualization Laboratory of Tsunami and Disaster Mitigation Research Center (Syiah Kuala University Jl. Prof. Ibrahim Hasan Gampong Pie Banda Aceh Indonesia) 2Tsunami Computation and Visualization Laboratory of Tsunami and Disaster Mitigation Research Center (Syiah Kuala University Jl. Prof. Ibrahim Hasan Gampong Pie Banda Aceh Indonesia) 1 23Tsunami Computation and Visualization Laboratory of Tsunami and Disaster Mitigation Research Center (Syiah Kuala University Jl. Prof. Ibrahim Hasan Gampong Pie Banda Aceh Indonesia) 1 3Civil Engineering Departement Syiah Kuala University (Jl. Syeh Abd Rauf No. 7 Banda Aceh Indonesia) 4Department of Architecture and Civil Engineering Toyohashi University of Technology (1-1 Tempaku-Cho 441-8580 Aichi Prefecture Japan)

The need for a new and improved fisheries port has significantly increased in the Bireuen District of Aceh, particularly in Peudada due to several factors presented in this paper. During this time the fishing port used by the communities located in the river channel makes it difficult for the fishermen to get into the port area due to the shallowness of the mouth of the estuary. Port master plan study is required to examine several possible locations for the proposed port. In planning the hydro-oceanographic aspects of the port is an essential requirement to determine the layout of a port. Several factors that need to be reviewed relating to the layout of the ports include sedimentation, waves, and currents. These factors affect the movement of the ship, tranquility waves in the port basin, and for the maintenance dredging of the harbor due to sedimentation. This study is aimed at estimating the best layout of the port basin between two scenarios due to the sedimentation process, waves propagation, and currents. The software used in this study is Delft3D developed by Deltares. The program can simulate waves, currents and sediment transport in coastal areas by using schematized grids. The simulation was performed under two scenarios port layout using three dominant wind direction influencing wave generation, i.e., Northwest, North, and Northeast. All two scenarios modeled by changing the direction of opening the mouth of the harbor. After one year, both scenarios simulation has created a new bathymetry map to select the best port layout based on smallest sedimentation volume.

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Projections of tsunami inundation area coupled with impacts of sea level rise in Banda Aceh, Indonesia

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AIP Conference Proceedings 2017年第1期1892卷

作者： Tursina Syamsidik Shigeru Kato 1Tsunami Computation and Visualization Laboratory Tsunami and Disaster Mitigation Research Center (TDMRC) Syiah Kuala University Jl. Prof. Ibrahim Hasan Gampong Pie Banda Aceh 23233 Indonesia 1 2Tsunami Computation and Visualization Laboratory Tsunami and Disaster Mitigation Research Center (TDMRC) Syiah Kuala University Jl. Prof. Ibrahim Hasan Gampong Pie Banda Aceh 23233 Indonesia 2Civil Engineering Department Syiah Kuala University Jl. Syeh Abdurrauf No. 7 Banda Aceh 23111 Indonesia 3Department of Architecture and Civil Engineering Toyohashi University of Technology 1-1 Tempaku-Cho 441-8580 Aichi Prefecture Japan

In a long term, sea level rise is anticipated to give devastating effects on Banda Aceh, as one of the coastal cities in the northern tip of Sumatra. The growth of the population and buildings in the city has come to the stage where the coastal area is vulnerable to any coastal hazard. Some public facilities and settlements have been constructed and keep expanding in the future. According to TOPEX/POSEIDON satellite images, 7 mm/year the sea level has been risen between 1992 and 2015 in this area. It is estimated that in the next 100 years, there will be 700 mm additional sea level rise which will give a setback more over to a rather flat area around the coast. This research is aim at investigating the influence of sea level rise toward the tsunami inundation on the land area particularly the impacts on Banda Aceh city. Cornell Multigrid Coupled tsunami Model (COMCOT) simulation numerically generated tsunami propagation. Topography and bathymetry data were collected from GEBCO and updated with the available nautical chart (DISHIDROS, JICA, and field measurements). Geological movement of the underwater fault was generated using Piatanesi and Lorito of 9.15 Mw 2004 multi-fault scenario. The inundation area produced by COMCOT revealed that the inundation area was expanded to several hundred meters from the shoreline. To investigate the impacts of tsunami wave on Banda Aceh, the inundation area were digitized and analyzed with Quantum GIS spatial tools. The Quantum GIS analyzed inundations area affected by the projected tsunami. It will give a new tsunami-prone coastal area map induced by sea level rise in 100 years.

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Predicting impact of SLR on coastal flooding in Banda Aceh coastal defences

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AIP Conference Proceedings 2017年第1期1892卷

作者： Musa Al’ala Syamsidik Shigeru Kato 1Graduate student at Civil Engineering Master Program Syiah Kuala University Jl. Syeh Abdurrauf No. 7 Banda Aceh 23111 Indonesia 1 2Tsunami Computation and Visualization Laboratory Tsunami and Disaster Mitigation Research Center (TDMRC) Syiah Kuala University Jl. Prof. Ibrahim Hasan Gampong Pie Banda Aceh 23233 Indonesia 2Civil Engineering Department Syiah Kuala University Jl. Syeh Abdurrauf No. 7 Banda Aceh 23111 Indonesia 3Department of Architecture and Civil Engineering Toyohashi University of Technology 1-1 Tempaku-Cho 441-8580 Aichi Prefecture Japan

Banda Aceh is a low-lying city located at the northern tip of Sumatra Island and situated at the conjuncture of Malacca Strait and the Andaman Sea. A Sea Level Rise (SLR) rate at 7 mm/year has been observed around this region. In the next 50 years, this city will face a serious challenge to encounter impacts of the sea level rise, such as frequent coastal floodings. This study is aimed at estimating impacts of the sea level rise induced coastal floodings on several types of coastal structures and city drainage system. Numerical simulations of Delft3D were applied to investigate the influence of the gradual sea level rise in 50 years. The hydrodynamic process of coastal flooding and sediment transport were simulated by Delft3D-Flow. Topography and bathymetry data were collected from GEBCO and updated with the available nautical chart (DISHIDROS, JICA, and field measurements). Hydrodynamic process gains the flow process revealing the level of the sea water intrusion also observed in the model. Main rivers (Krueng Aceh, Krueng Neng, and Alue Naga Flood Canal) and the drainage system were observed to see the tides effects on coastal structures and drainage system. The impact on coastal community focusing on affected area, shoreline retreat, the rate of sea intrusion was analyzed with spatial tools. New coastal line, coastal flooding vulnerable area, and the community susceptibility properties map influenced by 50 years sea level rise is produced. This research found that the city needs to address strategies to anticipate the exacerbating impacts of the sea level rise by managing its coastal spatial planning and modify its drainage system, especially at the drainage outlets.

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Preliminary study on performance of a coupled hydrodynamic and sediment transport model on small domain

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AIP Conference Proceedings 2017年第1期1892卷

作者： Teuku M. Rasyif Shigeru Kato Syamsidik Takumi Okabe 1Dept. of Architecture and Civil Eng. Toyohashi University of Technology 1-1 Tempaku Cho Toyohashi Aichi 441-8580 Japan 2Dept. of Architecture and Civil Eng. Toyohashi University of Technology 1-1 Tempaku Cho Toyohashi Aichi 441-8580 Japan 3Civil Engineering Department Syiah Kuala University Jl. Prof. Dr. Ibrahim Hasan Gampong Pie Banda Aceh 23233 Indonesia 4Tsunami Computation and Visualization Laboratory Tsunami and Disaster Mitigation Research Center (TDMRC) Syiah Kuala University Jl. Prof. Dr. Ibrahim Hasan Gampong Pie Banda Aceh 23233 Indonesia 5Dept. of Architecture and Civil Eng. Toyohashi University of Technology 1-1 Tempaku Cho Toyohashi Aichi 441-8580 Japan

Numerical simulation is one of the useful tools to analyze natural phenomena in the earth such as the tsunami disaster. Several numerical models can simulate the tsunami wave from its generation, propagation, and inundation. However, most tsunami models do not include the sediment transport module. The tsunami wave actually induces a lot of sediment during the propagation in the coastal area. In the case of Indian Ocean tsunami in 2004, massive morphological changes were caused by the tsunami waves around Sumatra coast. In Aceh, some areas eroded by the tsunami wave were living place for a local community. It is indispensable for the resident in the coastal area to estimate the risk of morphological changes due to a tsunami wave. Therefore, a model that can investigate the morphological changes due tsunami wave is necessary. The result of this model can be used to consider a countermeasure for tsunami wave impact in the coastal area, such as land-use management and planning. The COMCOT-SED model had been developed by several researchers. This model combines the hydrodynamic module and the sediment module. The aim of this study is to get general information about performance of the COMCOT-SED model and to modify the model for more accurate results. Firstly, the model was demonstrated in the ideal condition to confirm the model validity. Then, we evaluated the model performance comparing the model results and the laboratory experiment data which was conducted by other researcher. The authors found that the results of water level and bottom profile by the original model in the ideal condition are not suitable. The model modification will give us more suitable results. The modified model will be applied to simulate the tsunami wave and sediment transport in the small area.

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