Design of a rubble mound breakwater under the combined effect of wave heights and water levels, under present and future climate conditions

Radfar, Soheil; Shafieefar, Mehdi; Akbari, Hassan; Γαλιατσάτου, Παναγιώτα; Mazyak, Ahmad Rezaee

doi:10.1016/j.apor.2021.102711

Cited by 24 publications

(7 citation statements)

References 52 publications

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“…pravokotni, cilindrični). V osnovi valobrane razdelimo v tri skupine: (i) nasute valobrane, ki so običajno iz večjih kosov skal ali manjših betonskih blokov (Ghalandarzadeh et al, 2021;Radfar et al, 2021), (ii) monolitne oz. vertikalne valobrane, ki so običajno iz betona (Di Lauro et al, 2020;Han et al, 2021), in (iii) kompozitne valobrane, ki so narejeni iz betonske nadgradnje in spodaj ležečega nasutja (Najma in Ghalandarzadeh, 2019;Takahashi, 2021).…”

Section: Uvodunclassified

Stability of vertical breakwaters by applying the general rules of Eurocode 7

Kvočka

Žagar

2022

Acta Hydrotechnica

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Breakwaters are hydraulic structures designed to protect coastlines and coastal infrastructure, which are constantly exposed to the forces of the sea. Breakwaters are consequently subjected to a variety of hydrodynamic loads, wherefore breakwater stability must be prioritized during the breakwater design process. In this study, we examined the difference in the safety factor against overturning and sliding when the commonly used approach for calculating breakwater stability specified in BS 6349 was updated with the partial safety factors outlined in Eurocode 7. Our comparative analysis employed three different methods to calculate the hydrodynamic loads: the Sainflou method, the extended Goda method without the breakwater overtopping, and the extended Goda method with consideration of breakwater overtopping. The breakwater stability was calculated and compared for different breakwater widths, with constant wave parameters being used in all stability calculations. Within the stability calculations, we considered only overturning and sliding instability mechanisms. The obtained results show that there is no significant difference in the calculated breakwater stability coefficient between the two considered calculation procedures regardless of the method used for the calculation of the hydrodynamic loads. In order to develop a comprehensive approach for the calculation of breakwater stability based on the rules outlined in the Eurocodes, it would be necessary to determine the key processes and numerical models for calculating the stability of the foundation soil and to consider more precisely the impacts related to the breakwater shape and construction technique, construction materials, and local characteristics of the seabed.

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Section: Uvodunclassified

Stability of vertical breakwaters by applying the general rules of Eurocode 7

Kvočka

Žagar

2022

Acta Hydrotechnica

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“…Malliouri et al [52,53] have also performed a reliability analysis of rubble mound breakwaters based on an easy-to-use methodology to assess the failure probabilities of coastal structures based on probabilistic representation of sea conditions at the structures' location. Radfar et al [54] compared a commonly applied and joint probability approach for the design of a conventional rubble mound breakwater at the Makran coasts on the southern coast of Iran. The effects of climate change on the overtopping failure mechanism of the breakwater were also discussed, indicating that a higher freeboard and a lower overtopping discharge in the new design approach can reduce the vulnerability of the structure against projected future environmental changes.…”

Section: Literature Reviewmentioning

confidence: 99%

Nonstationary Extreme Value Analysis of Nearshore Sea-State Parameters under the Effects of Climate Change: Application to the Greek Coastal Zone and Port Structures

Γαλιατσάτου

Makris²,

Krestenitis³

et al. 2021

JMSE

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In the present work, a methodological framework, based on nonstationary extreme value analysis of nearshore sea-state parameters, is proposed for the identification of climate change impacts on coastal zone and port defense structures. The applications refer to the estimation of coastal hazards on characteristic Mediterranean microtidal littoral zones and the calculation of failure probabilities of typical rubble mound breakwaters in Greek ports. The proposed methodology hinges on the extraction of extreme wave characteristics and sea levels due to storm events affecting the coast, a nonstationary extreme value analysis of sea-state parameters and coastal responses using moving time windows, a fitting of parametric trends to nonstationary parameter estimates of the extreme value models, and an assessment of nonstationary failure probabilities on engineered port protection. The analysis includes estimation of extreme total water level (TWL) on several Greek coasts to approximate the projected coastal flooding hazard under climate change conditions in the 21st century. The TWL calculation considers the wave characteristics, sea level height due to storm surges, mean sea level (MSL) rise, and astronomical tidal ranges of the study areas. Moreover, the failure probabilities of a typical coastal defense structure are assessed for several failure mechanisms, considering variations in MSL, extreme wave climates, and storm surges in the vicinity of ports, within the framework of reliability analysis based on the nonstationary generalized extreme value (GEV) distribution. The methodology supports the investigation of future safety levels and possible periods of increased vulnerability of the studied structure to different ultimate limit states under extreme marine weather conditions associated with climate change, aiming at the development of appropriate upgrading solutions. The analysis suggests that the assumption of stationarity might underestimate the total failure probability of coastal structures under future extreme marine conditions.

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“…The recent advances in the geometric optimization of wave energy converters and other related research areas prove the effects of these studies on the power output enhancement of such systems [66,67]. Because OSWEC design optimization is beyond the scope of this paper, we conduct a comparative sensitivity analysis to determine the effect of flap height changes on power output during the peak period.…”

Section: Sensitivity Analysismentioning

confidence: 99%

Comparative Study of Oscillating Surge Wave Energy Converter Performance: A Case Study for Southern Coasts of the Caspian Sea

et al. 2021

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The search for renewable energy supplies for today’s global energy demand, particularly ocean wave energy for coastal areas, has become undeniably widespread in the last two decades. The Caspian Sea represents an immense opportunity for using ocean renewable energy, especially considering its long shoreline. In this study, the locations with maximum potential wave energy were chosen in the central, eastern, and western zones of the Caspian Sea’s southern coasts. Accordingly, the wave and bathymetric data were used as the input to calculate the oscillating surge wave energy converter’s flap geometric dimensions based on previous studies. Then, the geometric model was designed, and then the wave energy converters were modeled in the Wave Energy Converter Simulator (WEC-Sim) module in the MATLAB software. Furthermore, eight models in each sea state were simulated to find the best value of the PTO damping coefficient, which led to the highest capture factor. Finally, all the external forces on the WEC’s flap and the converter’s power output results were compared, taking into account the effects of the flap height on the total power output. It was found that Nowshahr port has more potential than the Anzali and Amirabad ports, as the converter’s absorbed power proved to be 16.7 kW/m (Capture factor = 63%) at this site. Consequently, by conducting a comparative analysis between the selected sites, the excitation, radiation damping, and power take-off forces were scrutinized. The results show that the highest applied forces to the converter’s flap occurred at Nowshahr port, followed by the Anzali and Amirabad ports, due to the directional characteristics of the waves at the central coasts of the Caspian Sea.

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Design of a rubble mound breakwater under the combined effect of wave heights and water levels, under present and future climate conditions

Cited by 24 publications

References 52 publications

Stability of vertical breakwaters by applying the general rules of Eurocode 7

Stability of vertical breakwaters by applying the general rules of Eurocode 7

Nonstationary Extreme Value Analysis of Nearshore Sea-State Parameters under the Effects of Climate Change: Application to the Greek Coastal Zone and Port Structures

Comparative Study of Oscillating Surge Wave Energy Converter Performance: A Case Study for Southern Coasts of the Caspian Sea

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