Özbahçeci, Bergüzar
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Oztunali Ozbahceci, Berguzar
Öztunalı Özbahçeci, Bergüzar
Özbahçeci, B. Öztunalı
Ozbahceci, B. Oztunali
Özbahçeci, BÖ
Özbahçeci, B. Ö.
Ozbahceci, BO
Ozbahceci, B. O.
Özbahçeci, Bergüzar Öztunalı
Ozbahceci, Berguzar Oztunali
Özbahçeci, Bergüzar Ö.
Ozbahceci, Berguzar O.
Ozbahceci, Berguzar
Özbahçeci, Bergözar
Ozbahceci, Bergozar
Özbahçeci, B.
Ozbahceci, B.
Öztunalı Özbahçeci, Bergüzar
Özbahçeci, B. Öztunalı
Ozbahceci, B. Oztunali
Özbahçeci, BÖ
Özbahçeci, B. Ö.
Ozbahceci, BO
Ozbahceci, B. O.
Özbahçeci, Bergüzar Öztunalı
Ozbahceci, Berguzar Oztunali
Özbahçeci, Bergüzar Ö.
Ozbahceci, Berguzar O.
Ozbahceci, Berguzar
Özbahçeci, Bergözar
Ozbahceci, Bergozar
Özbahçeci, B.
Ozbahceci, B.
Job Title
Email Address
berguzarozbahceci@iyte.edu.tr
Main Affiliation
03.03. Department of Civil Engineering
Status
Current Staff
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
1
Research Products
3GOOD HEALTH AND WELL-BEING
0
Research Products
4QUALITY EDUCATION
2
Research Products
5GENDER EQUALITY
0
Research Products
6CLEAN WATER AND SANITATION
1
Research Products
7AFFORDABLE AND CLEAN ENERGY
5
Research Products
8DECENT WORK AND ECONOMIC GROWTH
1
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
5
Research Products
10REDUCED INEQUALITIES
0
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
2
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
Research Products
13CLIMATE ACTION
2
Research Products
14LIFE BELOW WATER
6
Research Products
15LIFE ON LAND
2
Research Products
16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
17PARTNERSHIPS FOR THE GOALS
0
Research Products
Documents
19
Citations
339
h-index
6
This researcher does not have a WoS ID.
Scholarly Output
20
Articles
7
Views / Downloads
23535/7396
Supervised MSc Theses
7
Supervised PhD Theses
0
WoS Citation Count
269
Scopus Citation Count
310
Patents
0
Projects
4
WoS Citations per Publication
13.45
Scopus Citations per Publication
15.50
Open Access Source
12
Supervised Theses
7
| Journal | Count |
|---|---|
| Proceedings of the Coastal Engineering Conference | 3 |
| Advances in Space Research | 3 |
| Ocean Engineering | 2 |
| Continental Shelf Research | 1 |
| 14th MEDCOAST Congress on Coastal and Marine Sciences, Engineering, Management and Conservation, MEDCOAST 2019 | 1 |
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Scopus Quartile Distribution
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20 results
Scholarly Output Search Results
Now showing 1 - 10 of 20
Conference Object Citation - Scopus: 1A New Approach To Breakwater Design-2b Block(American Society of Civil Engineers (ASCE), 2016) Bilyay, Engin; Özbahçeci, Bergüzar; Bacanlı, Selahattin; Kızıroğlu, GülşenBreakwaters are one of the oldest and important marine structures. Rubble mound breakwater is a very common type in all around the world. If the heavier rock is necessary for the design, concrete armor units are used. Each unit has its own advantages and disadvantages. For example cube and antifer blocks are massive units and their interlocking is weak. Dolos and tribar units have good interlocking but rocking stresses in these units are extraordinarily high. The placement method is very important and requires special equipment and experienced staff for the later developed single-layered units like accropod and core-loc. Moreover, continuous touching of blocks to each other and fatigue of the material may cause the breakdown of legs and serious damage of armor layer. And in case of damage, it is necessary to remove the units in a wide area on the breakwater and then relocate them, so it is very difficult to repair. A new type concrete armor unit is developed considering all these problems. It is called 2B Blocks.Article Floating Pontoons to Reduce Wave Overtopping at a Vertical Seawall: An Experimental Study(Elsevier Ltd, 2026) Eroglu, N.; Ozbahceci, B.Coastal flooding caused by extreme wind, wave and water level conditions is an increasing concern, particularly for historical coastal cities where conventional flood defenses may be unsuitable due to aesthetic and cultural constraints. Floating structures have gained attention for their adaptability to sea level rise, yet previous studies have mainly examined wave transmission rather than their capacity to reduce wave overtopping. This study presents the first experimental investigation to directly measure wave overtopping for floating pontoons placed in front of a vertical seawall. Tests were conducted in a controlled wave flume environment to evaluate the effects of pontoon geometry, mooring type, and distance from the seawall on overtopping performance. The results show that floating pontoons can significantly reduce wave overtopping. Overtopping reductions of 75–98 % was achieved, with the most effective configuration combining high freeboard and large draft (1.5 m prototype scale). Wave transmission was also measured and compared with existing prediction formulas. When the transmitted wave height is used in EurOtop (2018) formula, overtopping rate is overestimated particularly when the relative crest freeboard exceeds 0.75 as differences in wave steepness, spectral period and directional spreading induced by the floating pontoon are not captured by the formula. To improve predictive capability, a new influence coefficient (γ<inf>fp</inf>) is proposed to modify Eq. 7.5 in EurOtop (2018) for cases involving pile-guided floating pontoons. These findings provide new experimental evidence on wave–structure interaction and highlight the potential of floating pontoons as effective, adaptable, and visually compatible flood mitigation solutions for vulnerable coastal regions. © 2025 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.Conference Object Extreme Wave Analysis Using Century Based Wave Climate Data(Mediterranean Coastal Foundation, 2019) Özbahçeci, Bergüzar; Turgut, Ahmet Rıza; Abdalla, SalehReliable and long-term wave data are essential for the design of almost all coastal and marine structures. In this study, the wave climate along the Turkish coasts was derived based on a century long data of European Centre for Medium-Range Weather Forecasts, CERA-20C. For this purpose, firstly, the data set was calibrated and verified by using the satellite and in-situ measurements. Then the design waves corresponding to various return periods were determined by extreme statistics. Therefore, a new and reliable design wave height data along the Turkish coasts have been provided for the designers and applicants. Results were compared with Wind and Deep Water Wave Atlas Along the Turkish Coasts (Ozhan and Abdalla, 2002). The comparison results indicate that the design wave heights provided by the Atlas are higher than the current study, especially in the Aegean Sea. © 14th MEDCOAST Congress on Coastal and Marine Sciences, Engineering, Management and Conservation, MEDCOAST 2019. All rights reserved.Conference Object An Experimental Study to Investigate the Efficiency of Floating Pontoons on the Wave Overtopping Reduction(International Society of Offshore and Polar Engineers, 2025) Ozbahceci, B.O.; Eroglu, N.There are many studies focused on the wave transmission performance of floating structures. However, the performance of floating structures to prevent coastal floods has not yet been investigated considering wave overtopping. This study aimed to experimentally assess the wave overtopping performance of a concrete floating pontoon in front of an existing vertical sea wall. The mean wave overtopping discharge, q, was compared for the cases with and without the floating pontoon model in front of the wall. Results showed that the baseline floating pontoon model reduced wave overtopping discharge by 30-90% compared to the case with the wall alone. Furthermore, the study revealed that an increase in freeboard or draft of the floating pontoon led to a greater reduction in wave overtopping. These findings suggest that the integration of a floating pontoon with optimized freeboard and draft could be an effective solution for reducing wave overtopping in coastal defense applications. © 2025 by the International Society of Offshore and Polar Engineers (ISOPE).Master Thesis Nearshore Wave Prediction Modeling for the Southern-West Coasts of the Black Sea and Comparison With the Wave Measurement Data(Izmir Institute of Technology, 2019) Güler, Muzaffer; Özbahçeci, BergüzarWhile waves propagate towards shallow areas where most of the coastal structures are constructed, their properties like wave height and direction may change. The change in the wave properties in shallow areas called wave transformation may happen due to a decrease in water depth, sea bottom configurations or some obstacles like islands. Therefore, it should be calculated to find the wave properties used in coastal engineering projects. In this study, the main purpose is to model the waves in the near-shore region of the Filyos coast in Zonguldak province of Turkey by a 3rd generation nearshore wave model, SWAN (Simulating Waves Nearshore). The newest re-analysis data, ERA5, of The European Centre for Medium-Range Weather Forecasts (ECMWF) are used as SWAN model input in deep water. The data are calibrated with satellite radar altimeter data before using the model input data. One of the targets of the study is to verify the developed model using data of an in-situ measurement campaign organized by the Turkish Ministry of Transport. A verification study is performed using not only all data but also using the storm data with higher waves. For the selected storms, statistical and spectral analyses of the raw data are also performed. Results of the verification study show that wave predictions obtained from the developed nearshore wave model using SWAN fit to in-situ measurements well. Results are also compared with the previous studies and it is concluded that error results are much better for the wave period.Conference Object Performance of Vertical Wall and Floating Breakwaters Combination for Datca Marina(ICE Publishing, 2014) Günbak, Ali Rıza; Öztunalı Özbahçeci, Bergüzar; Küçükosmanoğlu, Alp; Akbaş, Halit LeventDatca Marina is located at the South Western corner of Turkey at the Mediterranean Sea with steep sea bottom slopes (1/3-1/5). The water depths are changing between 4m to 37m at the breakwater location. Considering the high water depths and the wave characteristics, floating breakwater could be a good alternative for the marina. However, the performance of the floating breakwater may be limited due to the longer periods of the waves coming from E to SSE direction range. Therefore both a floating breakwater composed of 20 m length segments (B=5m wide, h=2,9m high) of total 526m and a vertical wall breakwater of 362m are decided to use for protecting the Marina against waves. The performance of the vertical wall and floating breakwaters combination is investigated by 3D hydraulic model experiments. Hydraulic model tests showed that the significant wave height may exceed 0.3m only 1,08% of the year. It is also found that floating breakwater is much more efficient under oblique wave attack and it is proposed to use the projection of oblique wave length to predict transmission coefficients of oblique waves.Master Thesis Wave Generation and Analysis in the Laboratory Wave Channel To Conduct Experiments on the Numerically Modeled Spar Type Floating Wind Turbine(01. Izmir Institute of Technology, 2020) Aktaş, Kadir; Özbahçeci, BergüzarThe oceans offer immense potential for harvesting sustainable wind energy, with stronger and steadier winds for locations further offshore. Since the feasibility of fixed-bottom offshore wind turbines decreases with increasing water depth, floating offshore wind turbines (FOWT) becomes a promising field of study. As part of a TÜBİTAK project (217M451) that investigates the dynamic performance of different FOWT designs under wind and wave loads, the necessary laboratory wave generation, analysis, and test set-up to conduct physical model experiments of a spar-type FOWT model is established in this study. An investigation of the wavemaker theory yielded that using first-order wavemaker solutions in the laboratory leads to the generation of spurious harmonic waves that do not appear in natural waves. Therefore, the second-order solutions are applied to the piston-type wave generator for a closer approximation of natural waves in laboratory conditions. A numerical model investigation of a reference spar-type FOWT is conducted to gain insights into spar design using ANSYS AQWA. The results indicate that the spar model dynamic responses are susceptible to low-frequency waves in pitch and surge degrees of freedom as its natural frequency lies in that region which further emphasizes the importance of generating laboratory waves using second-order wavemaker theory. Additionally, a spar-type floating platform is modeled at the 1/40 Froude scale, to use in the hydraulic model experiments. The wave measurement set-up is fully implemented and theoretically generated waves are measured for validation. In conclusion, regular and irregular wave generation and wave analysis in the time and the frequency domain could be possible in the wave channel of IZTECH Civil Engineering Hydraulic Laboratory.Article Citation - WoS: 226Citation - Scopus: 255Altimetry for the Future: Building on 25 Years of Progress(Elsevier, 2021) Abdalla, Saleh; Kolahchi, Abdolnabi Abdeh; Ablain, Michael; Adusumilli, Susheel; Bhowmick, Suchandra Aich; International Altimetry Team; Öztunalı Özbahçeci, BergüzarIn 2018 we celebrated 25 years of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and provides guidance for future mission design, research activities, and sustainable operational radar altimetry data exploitation. Recommendations provided are fundamental for optimizing further scientific and operational advances of oceanographic observations by altimetry, including requirements for spatial and temporal resolution of altimetric measurements, their accuracy and continuity. There are also new challenges and new openings mentioned in the paper that are particularly crucial for observations at higher latitudes, for coastal oceanography, for cryospheric studies and for hydrology. The paper starts with a general introduction followed by a section on Earth System Science including Ocean Dynamics, Sea Level, the Coastal Ocean, Hydrology, the Cryosphere and Polar Oceans and the Green Ocean, extending the frontier from biogeochemistry to marine ecology. Applications are described in a subsequent section, which covers Operational Oceanography, Weather, Hurricane Wave and Wind Forecasting, Climate projection. Instruments' development and satellite missions' evolutions are described in a fourth section. A fifth section covers the key observations that altimeters provide and their potential complements, from other Earth observation measurements to in situ data. Section 6 identifies the data and methods and provides some accuracy and resolution requirements for the wet tropospheric correction, the orbit and other geodetic requirements, the Mean Sea Surface, Geoid and Mean Dynamic Topography, Calibration and Validation, data accuracy, data access and handling (including the DUACS system). Section 7 brings a transversal view on scales, integration, artificial intelligence, and capacity building (education and training). Section 8 reviews the programmatic issues followed by a conclusion. (c) 2021 COSPAR. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/Article Citation - WoS: 1Citation - Scopus: 1Comparison of the Predicted and the Observed Wave Spectral Parameters During the Storms at Filyos Coasts, the Southwestern Black Sea(Elsevier, 2022) Öztunalı Özbahçeci, Bergüzar; Güler, MuzafferIn-situ wave measurement data are mainly used to validate the bulk wave parameters predicted by numerical models. Although the frequently used third-generation wave models are spectral models, determination of various spectral parameters and validation with the observed data are not common. This study covers the spectral analysis of selected storm records of a nearshore wave measurement campaign carried out at Filyos coasts with the complex bottom topography in Turkey, Southwestern Black Sea. The bulk wave and the spectral parameters are also calculated by a third-generation nearshore wave model, SWAN (Simulating Waves Nearshore), forced by the ERA5 offshore wave data, which is the newest re-analysis of the European Centre for Medium-Range Weather Forecasts (ECMWF) for the selected storms. Before using ERA5 offshore wave data, they are calibrated by the wave data of the satellite radar altimeter. In-situ measured bathymetry data are used in the SWAN model. Observed and predicted bulk wave and spectral parameters are compared, and the statistical error measures are calculated not only for the significant wave height, the peak period, and the peak wave direction but also for the three different spectral periods, three different frequency width parameters, a directional width and, a spectral peakedness parameter for the first time. Low values of statistical error measures show that the current wave predictions have a good agreement with the observed ones in terms of the significant wave height, Hs, and the peak period, Tp. However, the SWAN model predicts a slightly narrower frequency and directional spectrum with higher peaks, although the error measures are low. Moreover, SWAN can not predict the wide range of spectral shape occurrences that the observed spectra have. The development of the various spectral parameters during the storms is also investigated for the first time. It is found that the frequency and directional spreading of the observed spectra become wider and unsharpened in the late stages of the storm compared to the early stages. However, the same tendency is not observed clearly in the predicted directional spreadingArticle Citation - WoS: 15Citation - Scopus: 18Extreme Value Statistics of Wind Speed and Wave Height of the Marmara Sea Based on Combined Radar Altimeter Data(Elsevier, 2019) Özbahçeci, BergüzarBoth reliable and long-term wind and wave data are necessary for the design of coastal and offshore structures. Due to lack of sufficient in-situ measurement data, modeling data have been used in the limited number of wind and wave climate studies of the Marmara Sea. Satellites equipped with instruments capable of observing marine surface wind and ocean waves like Radar Altimeter can be another source for the long term wind and wave climate of the Marmara Sea. In this study, for the first time, the altimeter wind speed and the significant wave height data from different satellite missions are attempted to use in the climate and extreme value analysis of the Marmara Sea. Altimeter wind speeds and significant wave heights are compared with the in-situ measurements and it is found that while the altimeter wind speed agrees with the measurement data, the significant wave height data should be calibrated. After the calibration of the altimeter data and the inter-calibrations of earlier satellite missions, 27 years of altimeter wind speed and wave height data are obtained to use in extreme value analysis. The wind speed and the significant wave height values corresponding to various return periods are determined as a result of extreme value statistics and those values are compared with the results of the measurements and previous studies. Consistent extreme values computed in the current study indicate that the combined radar altimeter data can be used in the wind and the wave climate calculations and the extreme value analysis of the Marmara Sea. © 2019 COSPAR