- Frontier letter
- Open Access
Assessment of tsunami resilience of Haydarpaşa Port in the Sea of Marmara by high-resolution numerical modeling
© The Author(s) 2016
- Received: 27 October 2015
- Accepted: 6 July 2016
- Published: 2 August 2016
Turkey is highly prone to earthquakes because of active fault zones in the region. The Marmara region located at the western extension of the North Anatolian Fault Zone (NAFZ) is one of the most tectonically active zones in Turkey. Numerous catastrophic events such as earthquakes or earthquake/landslide-induced tsunamis have occurred in the Marmara Sea basin. According to studies on the past tsunami records, the Marmara coasts have been hit by 35 different tsunami events in the last 2000 years. The recent occurrences of catastrophic tsunamis in the world’s oceans have also raised awareness about tsunamis that might take place around the Marmara coasts. Similarly, comprehensive studies on tsunamis, such as preparation of tsunami databases, tsunami hazard analysis and assessments, risk evaluations for the potential tsunami-prone regions, and establishing warning systems have accelerated. However, a complete tsunami inundation analysis in high resolution will provide a better understanding of the effects of tsunamis on a specific critical structure located in the Marmara Sea. Ports are one of those critical structures that are susceptible to marine disasters. Resilience of ports and harbors against tsunamis are essential for proper, efficient, and successful rescue operations to reduce loss of life and property. Considering this, high-resolution simulations have been carried out in the Marmara Sea by focusing on Haydarpaşa Port of the megacity Istanbul. In the first stage of simulations, the most critical tsunami sources possibly effective for Haydarpaşa Port were inputted, and the computed tsunami parameters at the port were compared to determine the most critical tsunami scenario. In the second stage of simulations, the nested domains from 90 m gird size to 10 m grid size (in the port region) were used, and the most critical tsunami scenario was modeled. In the third stage of simulations, the topography of the port and its regions were used in the two nested domains in 3-m and 1-m resolutions and the water elevations computed from the previous simulations were inputted from the border of the large domain. A tsunami numerical code, NAMI DANCE, was used in the simulations. The tsunami parameters in the highest resolution were computed in and around the port. The effect of the data resolution on the computed results has been presented. The performance of the port structures and possible effects of tsunami on port operations have been discussed. Since the harbor protection structures have not been designed to withstand tsunamis, the breakwaters’ stability becomes one of the major concerns for less agitation and inundation under tsunami in Haydarpaşa Port for resilience. The flow depth, momentum fluxes, and current pattern are the other concerns that cause unexpected circulations and uncontrolled movements of objects on land and vessels in the sea.
- Marmara Sea
The Sea of Marmara is located on the western extension of the North Anatolian Fault Zone (NAFZ). It has three branches, two of which extend in the Marmara Sea. NAFZ is one of the most important active faults with strike-slip characteristics, which are not likely to generate tsunami. However, in the light of tsunami catalogs based on historical documents, it is possible to say that Marmara Sea has tsunamigenic potential. Based on the latest tsunami catalog on tsunamis triggered around the Turkish coasts, which was prepared by Altinok et al. (2011), 35 tsunami events out of 134 from the seventeenth century BC to the recent 1999 Marmara event have occurred in the Sea of Marmara. Since numerous catastrophic tsunami events have occurred in the Marmara Sea basin and may continue to occur in the future, various studies were conducted on tsunamis in the Sea of Marmara by Yalciner et al. (2002); Altinok et al. (2011); Papadopoulos et al. (2014); Hébert et al. (2005); Insel (2009); Aydin (2014); Ayca (2012); Ozel et al. (2011); Ozdemir (2014); Aytöre et al. (2013, 2014); and Aytöre (2015).
Water-related disasters, particularly tsunamis, should be carefully investigated since many of the historical, industrial, and commercial structures are situated near the coastal areas of Istanbul. These can cause excessive damage especially on the ports as a consequence of their vulnerability against such forces and may in turn cause not just loss of life, but also loss of property resulting in negative economic effect on the region and even the country. Hence, the Haydarpaşa Port area was selected for the case study of tsunami assessment. Guler et al. (2015) studied the performance of Haydarpaşa breakwaters under the attack of solitary-type long waves and continuous overflow by physical model experiments. In this study, the port was selected for a case study since the trapped tsunami waves inside the ports or enclosed basins lead to strong currents, tend to show resonant amplifications for hours, and damage the port components and structures. Hence, after the tsunami, the port operations are interrupted. Assessment of such damaging effects of tsunamis inside the harbors is important for the management of post-disaster operations.
The bathymetric data for high-resolution modeling were acquired from General Bathymetric Chart of the Oceans (GEBCO 2016) of the British Oceanographic Data Centre (spatial resolution of 30 arc seconds). The dataset obtained from the navigational charts was added to improve the bathymetric data in the shallow zone. Besides, the images from Google Earth were used to define a better shoreline and location of the breakwaters in the selected domain. The cross section of breakwaters of Haydarpaşa Port was acquired from the technical drawings used in the construction of the breakwaters.
Based on the selected study domains for numerical modeling, topographical and bathymetric data were eliminated and processed. A series of simulations performed in this study was categorized into two different model applications: Model 1 was used for the determination of the critical submarine source near the port and Model 2 was used for high-resolution numerical modeling. Two different models were created since decreasing the grid size to a very small value to cover a large area such as the Marmara Sea results in a very large size of matrix, which causes a longer simulation duration.
Summary of the grid size and boundaries of study domains of Models 1 and 2
Grid size (m)
Coordinates of the domains
40.987°– 41.015° N
The numerical code, NAMI DANCE, was used in the simulations. The code solves nonlinear forms of shallow-water relations with friction and computes the principal tsunami hydrodynamic parameters, namely water surface elevation, current velocities and their directions, flow depth, and Froude number of the selected output time intervals throughout the study domain in either a Cartesian or spherical coordinate system. Moreover, the model can calculate using either the static source data created as an initial wave or dynamic source data (time history of water surface fluctuation) inputted as a line from an arbitrary location. The improved code version was applied here, calculating the land inundation more precisely, without instability by using very fine bathymetric/topographical data (NAMI DANCE 2016). The duration of the simulations was 90 min, and the selected time step was 0.005 s, which satisfies the CFL condition. Since the largest tsunami waves hit the area in the first 45 min, 90 min of propagation was considered to obtain reliable results, including wave reflections. The simulation duration also included the arrival of the wave reflected from the southern coast of the Marmara Sea. In addition, the friction coefficient was taken as zero.
The two breakwaters in the region reduce the effect of tsunami waves on the coast and port environments. However, wave overtopping was observed on the breakwaters after a while. It is possible that this overtopping discharge will damage the breakwaters and affect their stability. This may lead to an increase in tsunami inundation extent presented in this study.
Higher run-up values were observed at the corners of the inner (rhombohedron-shaped) basin. They trap water inside and cause additional water level increase inside the inner basins.
The current velocities exceeded 6 m/s at some locations, especially in the region bounded by two parallel breakwaters and at the entrance of the circular basin. Current velocities were also high around the breakwaters, which may have caused scouring at the toe of the coastal structures.
The simulation shows that the water flowed parallel to the breakwaters during the tsunami. The flow of water parallel to rubble-mound breakwater may have caused scouring at the toe of the slope and instability of the breakwater.
Some structures located the near shoreline may have been partially damaged as a result of the impact of tsunami waves.
Damages and dragging of floating bodies such as cargo vessels or ferries due to strong currents and water level rise at the port should be expected. Similarly, they can damage some structures near the coastline.
Since this is the largest container port in the Marmara region, a great number of containers are usually present at various locations around it. High current velocities were especially observed in the rhombohedron-shaped basin in the port. Thus, the containers in this area can also be floated and dragged.
- 8.The selected study area is an urbanized area and hosts many structures in the coastal zone. Current velocities might increase in between the solid structures because of channel effect. For example, two storage buildings of the port are located in the rhombohedron-shaped basin, parallel to each other, as shown in Fig. 9. Two different profiles were considered for the examination of the channel effect. One of the profiles was located adjacent to the storage buildings, and the other one is located along the storage buildings. As shown in Fig. 9, the current velocities are higher between the storage buildings as expected.
Even if the simulation results do not show wave penetration in the railway lines at Haydarpaşa Train Station, it is also recommended that protective structures (walls, dikes) against tsunami inundation should be installed to prevent unexpected damages on transportation elements at the station (see Fig. 7).
Although this study focused on Haydarpaşa Port, the arc-shaped bay to the south of the port near Kadikoy is also another important area. Because there are inter-city passenger and ferry terminals, it serves as one of the most important business districts of Istanbul at Kadikoy. This area is highly inundated according to the simulation results. Thus, tsunami hazard analysis, specifically for the Kadikoy district, is also necessary (see Fig. 9).
In brief, it is also safe to say that a tsunami will negatively affect this urbanized area and its economic and social aspects.
Based on the simulation results of the high-resolution numerical modeling for Haydarpaşa Port, the water inside the port will be agitated and water flow parallel to the breakwaters will affect major port operations. This behavior will cause amplification of the water level and current velocities inside the port. Damages and dragging of floating bodies due to strong currents and water level rise at the port should also be expected.
During this study, the friction effect on the calculated tsunami parameters was ignored. It has been suggested for future studies to investigate the effect of friction on the calculated tsunami parameters by defining proper Manning’s coefficient scheme for the entire topography. The vegetation of the selected area should also be considered because presence of vegetation may prevent the tsunami waves to penetrate to the inner zones, and thus, change the inundation extent.
Resilience of Haydarpaşa Port after a disaster is important for Istanbul. The port operations should not be affected after a tsunami. One of the main requirements to enhance the resilience of Haydarpaşa Port is to prevent the damage of port components, which can be achieved by less amplification inside the port and less inundation at the area of cargo handling and storage facilities. Since one of the main causes of amplification is the parallel reflective berths at the rhombohedron-shaped basin, the reflective surfaces in the port must be maintained to reduce the wave amplification.
In addition, the vulnerability analysis of the port and its surrounding area can be performed in future studies, and the high-resolution map of this region is available with the detailed structural information.
BA has compiled and processed the data, carried out the simulations, analyzed the simulation results, converted them to graphical representations, and conducted necessary discussions/comparisons in her MSc thesis. She also interpreted the simulation results and made necessary discussions and conclusions. ACY developed the tsunami numerical model with AZ, and monitored the simulations and supervised BA thesis work at all stages, from the beginning to the defense. He also contributed to the interpretation of the simulation results and necessary discussions and conclusions. AZ developed the tsunami numerical code NAMI DANCE with ACY, and he inserted the necessary output parameters to the code for the paper. He also contributed to the interpretation of the simulation results, discussions, and conclusions. Z\CC and LS dedicated their expertise to the assessment and quality of the compiled high-resolution topographic data considering the buildings and all other structures at Haydarpasa and its surroundings. They also contributed to the interpretation of the simulation results, discussions, and conclusions. All authors read and approved the final manuscript.
This study was partly supported by Japan–Turkey Joint Research Project by JICA on earthquakes and tsunamis in the Marmara region by MarDim SATREPS, EC project ASTARTE-Assessment, Strategy And Risk Reduction for Tsunamis in Europe - FP7-ENV2013 6.4-3, Grant 603839, UDAP-Ç-12-14 project granted by Disaster Emergency Management Presidency of Turkey (AFAD), and RAPSODI (CONCERT_Dis-021) project in the framework of CONCERT-Japan, Research and Innovation Joint Call for connecting and cooperating European Research and Technology Development with Japan and TUBITAK 113M556 and 108Y227 Projects.
The authors declare that they have no competing interests.
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