Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

OCEANOGRAPHY (88 journals)

Showing 1 - 77 of 77 Journals sorted by number of followers
Deep Sea Research Part II: Topical Studies in Oceanography     Hybrid Journal   (Followers: 29)
Deep Sea Research Part I : Oceanographic Research Papers     Hybrid Journal   (Followers: 23)
Estuaries and Coasts     Hybrid Journal   (Followers: 23)
Limnology and Oceanography     Hybrid Journal   (Followers: 22)
Progress in Oceanography     Hybrid Journal   (Followers: 21)
Journal of Marine Biology & Oceanography     Hybrid Journal   (Followers: 19)
New Zealand Journal of Marine and Freshwater Research     Hybrid Journal   (Followers: 18)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 18)
Frontiers in Marine Science     Open Access   (Followers: 17)
Journal of Marine Sciences     Open Access   (Followers: 17)
Coastal Engineering     Hybrid Journal   (Followers: 15)
Advances in Oceanography and Limnology     Open Access   (Followers: 15)
Journal of Oceanography     Hybrid Journal   (Followers: 14)
Maritime Studies     Open Access   (Followers: 13)
International Journal of Oceanography     Open Access   (Followers: 12)
Advances in Statistical Climatology, Meteorology and Oceanography     Open Access   (Followers: 11)
Atmospheric and Oceanic Science Letters     Open Access   (Followers: 10)
Bulletin of Marine Science     Full-text available via subscription   (Followers: 9)
Fisheries Oceanography     Hybrid Journal   (Followers: 8)
Journal of Oceanography and Marine Science     Open Access   (Followers: 7)
Open Journal of Marine Science     Open Access   (Followers: 6)
Limnology and Oceanography: Methods     Hybrid Journal   (Followers: 6)
Journal of Operational Oceanography     Hybrid Journal   (Followers: 6)
Physical Oceanography     Hybrid Journal   (Followers: 6)
Paleoceanography and Paleoclimatology     Full-text available via subscription   (Followers: 5)
Marine Science     Open Access   (Followers: 5)
Limnology and Oceanography: Fluids and Environments     Full-text available via subscription   (Followers: 5)
Ocean Yearbook Online     Hybrid Journal   (Followers: 4)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 4)
Limnology and Oceanography Letters     Open Access   (Followers: 4)
Journal of Marine Science and Engineering     Open Access   (Followers: 4)
African Journal of Marine Science     Hybrid Journal   (Followers: 4)
Oceanology     Hybrid Journal   (Followers: 3)
Journal of Aquatic Sciences     Full-text available via subscription   (Followers: 3)
Limnology and Oceanography e-Lectures     Open Access   (Followers: 3)
Journal of Coastal Development     Open Access   (Followers: 3)
Ciencias Marinas     Open Access   (Followers: 3)
Journal of Marine Science and Application     Hybrid Journal   (Followers: 3)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 3)
Tropical Oceanography     Open Access   (Followers: 2)
Indian Journal of Geo-Marine Sciences     Open Access   (Followers: 2)
Mediterranean Marine Science     Open Access   (Followers: 2)
Regional Studies in Marine Science     Hybrid Journal   (Followers: 2)
Annals of Marine Science     Open Access   (Followers: 2)
Limnology and Oceanography: Bulletin     Hybrid Journal   (Followers: 2)
Annals of Limnology and Oceanography     Open Access   (Followers: 2)
Development and Applications of Oceanic Engineering     Open Access   (Followers: 2)
Journal of Ocean Engineering and Technology     Open Access   (Followers: 1)
Acta Aquatica : Aquatic Sciences Journal     Open Access   (Followers: 1)
Ocean Life     Open Access   (Followers: 1)
Marine Systems & Ocean Technology     Hybrid Journal   (Followers: 1)
Marine Life Science & Technology     Hybrid Journal   (Followers: 1)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 1)
Journal of Ocean Engineering and Science     Open Access   (Followers: 1)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 1)
Marine Technology Society Journal     Full-text available via subscription   (Followers: 1)
Scientia Marina     Open Access   (Followers: 1)
Western Indian Ocean Journal of Marine Science     Open Access   (Followers: 1)
Asian Journal of Fisheries and Aquatic Research     Open Access  
Thalassas : An International Journal of Marine Sciences     Hybrid Journal  
Oceans     Open Access  
Aquatic Research     Open Access  
Jurnal Kelautan Tropis     Open Access  
Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan     Open Access  
Journal of Agricultural and Marine Sciences     Open Access  
Turkish Journal of Maritime and Marine Sciences     Open Access  
Arquivos de Ciências do Mar     Open Access  
Scientific Drilling     Open Access  
Jurnal Kelautan : Indonesian Journal of Marine Science and Technology     Open Access  
Oceanologia     Open Access  
Revista de Gestão Costeira Integrada     Open Access  
Revista Ciencias Marinas y Costeras     Open Access  
Egyptian Journal of Aquatic Research     Open Access  
China Ocean Engineering     Hybrid Journal  
Revista de Biología Marina y Oceanografía     Open Access  
Latin American Journal of Aquatic Research     Open Access  
Acta Oceanologica Sinica     Hybrid Journal  
Similar Journals
Journal Cover
Journal of Ocean Engineering and Marine Energy
Journal Prestige (SJR): 0.913
Citation Impact (citeScore): 2
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2198-6444 - ISSN (Online) 2198-6452
Published by Springer-Verlag Homepage  [2467 journals]
  • Publisher Erratum: CFD analysis of the hull form of a manned submersible
           for minimizing resistance

    • Free pre-print version: Loading...

      PubDate: 2023-02-01
       
  • Buckling and stability of subsea HP/HT pipelines on laterally sloping
           seabeds

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      Abstract: Abstract Subsea pipelines are commonly subjected to high compressive axial loads that may result in various types of displacements. The majority of deformations for non-buried pipelines occurs in the form of lateral buckling. Uncontrolled lateral buckling may cause serious problems for pipeline stability, pigability, and structural integrity. Subsea pipelines occasionally are installed on sloping regions, consequently a probable lateral slope throughout the pipeline route contributes to its buckling behavior. The current design practice in industry ignores the effect of lateral slopes on the buckling behavior. It is shown in this study that the impact of the sloping seabed may become significant and needs to be considered in the current design guidelines. An analytical study is performed in this paper by utilizing MATLAB software to investigate pipeline behavior on sloping seabed and the proposed methodology is validated against existing case studies in the literature. It is then used to validate FE models in ABAQUS software. Critical buckling force as well as pipeline lateral deformation are evaluated for a pipeline on sloping seabed areas. Moreover, it is investigated that the operational startups and shutdowns can considerably increase the buckle size on the sloping seabed. The result shows how hydrodynamic forces of steady-state currents may displace a HP/HT pipeline significantly. The results presented in this paper can provide a better understanding of lateral buckling characteristics in sloping seabed situations. Based upon the outcomes, sloping seabed conditions need to be considered for appropriate design to ensure that the pipeline stays safely in place and deformations are predicted as to prevent uncontrolled lateral buckles.
      PubDate: 2023-02-01
       
  • Extension of a coupled mooring–viscous flow solver to account for
           mooring–joint–multibody interaction in waves

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      Abstract: Abstract To account for nonlinear wave–structure interaction, mooring dynamics and the associated viscous flow effects, a coupled mooring–viscous flow solver was formerly developed and validated (Jiang et al. in Mar Struct 72:783, 2020a, Validation of a dynamic mooring model coupled with a RANS solver). This paper presents an extension of the coupled mooring–viscous flow solver to solve mooring dynamics interacting with an articulated multibody offshore system. The presently extended solver is verified by comparing the predicted motions of and loads on a moored floating box to those obtained from the formerly validated solver, which was aimed for solving mooring dynamics interacting with a single floating body. The almost identical results obtained from both solvers verify the presently developed multi-module coupling technique for solving the mooring dynamics and articulated multibody dynamics in a coupled manner. Apart from the code comparison and verification, the numerical predictions are also validated against experimental tank measurements both for a single body and an articulated multibody. The good agreements between the numerical predictions and the experimental measurements validate the presently extended solver, where wave-induced body motions together with loads acting on mooring lines and joint connections were examined. Developed as an open-source tool, the extended solver shows a potential of the coupled methodology for analyzing an articulated multibody offshore system, moored with various mooring configurations in extreme sea states, which goes beyond the state of the art.
      PubDate: 2023-02-01
       
  • Motion and elastic response of wind-tracing floating offshore wind
           turbines

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      Abstract: Abstract A multi-unit floating offshore wind turbine concept, the wind-tracing floating offshore wind turbine, is introduced. In this concept, the floating structure is a triangular platform that hosts three 5 MW wind turbines and is moored to the seabed with a turret-bearing mooring system. This mooring system allows the structure to rotate about the turret such that the total yaw moment by the environmental load on the turret is minimized. In this study, the optimum properties of the mooring lines and the location of the turret are determined. To identify the preferred location of the turret, the responses of the structure to combined co-directional and misaligned wind and wave loads are computed. The motions of the structure are obtained with a frequency-domain numerical model integrated with structural finite-element method for hydroelastic and aeroelastic analyses. The hydrodynamic and aerodynamic loads are obtained by wave diffraction theory and steady blade element momentum method, respectively. Finally, with the optimum configuration of the mooring system, the motion and aero- and hydroelastic responses of the fully flexible wind-tracing floating offshore wind turbines to combined waves and wind loads are determined and discussed.
      PubDate: 2023-02-01
       
  • Analytical modeling of flexible circular submerged mound motion in gravity
           waves

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      Abstract: Abstract Submerged flexible mounds are designed to reduce the incident waves’ energy based on their motion, allowing for greater movements by attaching at one side to the bottom. In the present approach, an approximate analytical solution is proposed based on the Fourier transform and Hamilton’s principle to investigate the structural displacements of a submerged mound in waves. Experimental data and image processing techniques are employed to verify the analytical results. Validation is performed using experimental data with different wave heights and finite water depths. Comparison with the available experimental data suggests that the proposed approximate analytical model is an appropriate tool to predict the structural movements accurately.
      PubDate: 2023-02-01
       
  • Spatio-temporal variability of mean wave energy flux in the Caribbean Sea

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      Abstract: Abstract Mean wave energy flux (hereinafter WEF) is assessed in the Caribbean Sea from a 60-year (1958–2017) wave hindcast. We use a novel approach, based on neural networks, to identify coherent regions of WEF and their association with different climate patterns. This method allows for a better evaluation of the underlying dynamics behind seasonal and inter-annual WEF variability, including the effect induced by the latitudinal migration of the Intertropical Convergence Zone (ITCZ) and the influence of El Niño-Southern Oscillation (ENSO) events. Results show regional differences in WEF variability likely due to both intensification and migration of the ITCZ. WEF exhibits a strong semi-seasonal signal in areas of the continental shelf, with maxima reached in January and June, in agreement with the known sea surface temperature and sea-level pressure variability patterns. At larger scales, WEF shows a significant correlation with the Oceanic Niño Index (ONI, which is the primary index for tracking the ocean part of ENSO climate pattern), depicting positive values in the central and western sides of the basin and negative ones at the eastern side.
      PubDate: 2023-02-01
       
  • CFD analysis of the hull form of a manned submersible for minimizing
           resistance

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      Abstract: Abstract A manned submersible is an underwater vehicle that is capable of operating independently. During the design process, estimating resistance and power is key to choosing the right propeller. The shape improvement of the manned submersible has a significant impact on the submersible's energy utilization and endurance. Using computational fluid dynamics (CFD), it is possible to accurately calculate the forces acting on manned submersibles. A CFD flow analysis framework has been formulated and the process applied to circular bodies of different lengths. To validate the results of the numerical analysis, the results are compared with experimental results available in the literature. The validated CFD framework was used to conduct the flow analysis on manned submersibles of different sizes and shapes to minimize the resistance. The optimized shape resistance is further utilized for thruster selection and to estimate the descent speed, ascent speed, descent time and ascent time for a 6000 m rated vehicle.
      PubDate: 2023-02-01
       
  • Pre-swirl fins design for improved propulsive performances: application to
           fast twin-screw passenger ships

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      Abstract: Abstract Pre-swirl fins-based energy saving devices (ESDs) have been designed to improve the propulsive performances of twin-screw ships. To this aim, a combined BEM/RANSE method for efficient self-propulsion prediction is required. The approach is included in a framework for a design by optimization, where systematic variations of the ESD geometry have been used to explore the design space and maximize the energy-saving effect of the device. Surrogate models based on Ordinary Kriging are used too, with the aim of realizing an affordable design workflow for the very preliminary design of such devices. The results show encouraging improvements that reach promising energy-savings up to 3% at the design point and satisfactory savings also in off-design functioning conditions.
      PubDate: 2023-02-01
       
  • The effect of reclamation on the significant wave height changes in
           Jakarta Bay during Hagibis and Mitag typhoons

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      Abstract: Abstract The intensity and frequency of extreme events due to climate change in the future will most likely increase, as suggested in the sixth IPCC assessment report. Climate change has been propounded as one of the prominent causes of the ocean’s extreme events, particularly those associated with atmosphere–sea interaction occurring in the tropical region of Indonesia. A typhoon is an extreme event that forms in the Western North Pacific Ocean and causes changes in oceanographic parameters in a region far from its origin point. Thus, the goal of this study is to investigate how extreme events like Hagibis and Mitag typhoons affect the Significant Wave Height (SWH) in Jakarta Bay, particularly in the reclamation areas. SWH changes in Jakarta Bay due to the reclamation of Kita, Maju, and Bersama coastal areas have been simulated during both typhoons from 19th to 27th November 2007. The simulation was run from 1st October to 31st December 2007 using the Simulating WAve Nearshore (SWAN) model, and it was performed for two scenarios of pre-reclamation and post-reclamation. The analysis used a lagged correlation between wind speed magnitude in the study area within the South China Sea (SCS) and Indonesian Archipelago and SWH in Jakarta Bay from 19th November to 13th December 2007. It was found that the amplification of SWH changes in Jakarta Bay was associated with swell propagation from the SCS and Philippines, where Hagibis and Mitag typhoons were formed. The result exhibited that the most affected SWH due to the peak phase of Hagibis and Mitag typhoons (23rd November 2007) in Jakarta Bay was after an 11-day travel time, which was on 4th December 2007 compared to other dates. Hence, SWH during post-reclamation with regard to the three established reclamation areas (Kita, Maju, and Bersama coastal areas) responded to changes in SWH in Jakata Bay by up to 38.82% and down to 1.75% in Maju and Kita coastal areas, respectively.
      PubDate: 2023-02-01
       
  • Analysis of current influence on the wind wave parameters in the Black Sea
           based on SWAN simulations

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      Abstract: Abstract This study is dedicated to the assessment of the current influence on the wind wave height in the Black Sea based on numerical modeling. The research was carried out based on the SWAN wave model driven by NCEP/CFSv2 wind reanalysis. Current data from the Remote Sensing Department's archive of the Marine Hydrophysical Institute of RAS were used. It is shown that the average wave height mainly decreases when sea currents are considered. These changes are insignificant relative to the average values of wave heights. The greatest negative changes are typical for the western, central, and northeast parts of the Black Sea. Here, currents reduce the average annual wave heights down to – 7.5 cm. A slight increase in the average wave height is typical for the southern, southeast parts, and the northwest shelf of the sea. Currents have the greatest influence on the wave parameters during winter and the least during late spring and summer. The validation shows that currents increase the correlation coefficient when wave heights are > 2 m, but this increase is insignificant, over 0.05. In general, the quality of wave simulation in the Black Sea does not improve by supplementing currents in the model used in this study.
      PubDate: 2023-02-01
       
  • Research progress and prospects of gliding robots applied in ocean
           observation

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      Abstract: Abstract Ocean observation is the prerequisite for the human to cognize and develop the ocean. Most autonomous ocean-observation platforms (AOOPs), for their limited endurance, cannot cope with the further application in large range and long-term marine operations. Gliding robots have become one category of the most powerful platforms in ocean observation for their super endurance, with marine renewable energy acquisition or new driving modes. This paper starts with the comparation of the performance characteristics of several typical AOOPs, and introduces the definition and classification of the gliding robots according to their certain features. The research progresses of each gliding robot to date are discussed, including underwater glider, wave glider and multifunction hybrid glider. The prospects for the future development of related technologies in gliding robots are also represented in this paper, which will provide a reference for novel AOOPs’ construction and application selection in ocean observation, based on carrying different sensors.
      PubDate: 2023-02-01
       
  • Effect of blade leading-edge microcylinder in a Wells turbine used for
           wave energy converters

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      Abstract: Abstract The present study attempts to enhance a Wells turbine performance by adopting a leading-edge microcylinder (LEM) as a passive flow control device. The microcylinder is placed near the blade leading edge so that its axis lies on the chord line of the rotor blade. The influence of turbine performance, due to parameters such as microcylinder diameter and the distance between the cylinder and the blade leading edge, is evaluated by solving the steady Reynolds-averaged Navier–Stoke (RANS) equations with the k-ω SST turbulence model. The performance parameters of the microcylinder rotor were compared with the reference rotor. It was found that the pair of counter-rotating and co-rotating vortices shed from the microcylinder feed kinetic energy to the separated flow and re-energize the boundary layer. This phenomenon delays the flow separation and enhances the operating range. Moreover, a parametric investigation of the microcylinder rotor reveals that the diameter and space between the microcylinder and the rotor blade are instrumental in delaying flow separation. It was found that a cylinder diameter equal to 0.02C (C is blade chord) and a distance between the leading edge and the micro cylinder equal to 0.035C resulted in increases in the working range and in the average torque equal to about 22% and 49%, respectively.
      PubDate: 2023-01-30
       
  • Wave interaction with multiple bodies bottom-mounted on an undulated
           seabed using an exact DtN artificial boundary condition

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      Abstract: Abstract For the interaction between ocean wave and bottom-mounted structures, it is often required to introduce an artificial interface by which the fluid domain unbounded horizontally is divided into an interior subdomain with finite volume and an exterior one, to focus on the structures and the interior fluid subdomain only. In this paper, an artificial circular cylindrical surface and a novel Dirichlet-to-Neumann (DtN) map on it are suggested to close the constitutive equations in the interior subdomain since the top and bottom faces of the interior subdomain satisfy free surface condition and seabed condition, respectively. The DtN map is used as a boundary condition of the problem for the interior subdomain, which will be solved using the method of boundary integral equation (BIE). Upon successful validation for a bottom-mounted circular cylinder, the present method is extended to the cases of a single rounded-rectangular cylinder and an array of four cylinders mounted on a flat or undulated seabed to obtain three-dimensional wave elevation around them and to study the effects of fillet radius and incident angle on the wave force acting on each cylinder.
      PubDate: 2023-01-30
       
  • Wind resource assessment over the Persian Gulf and Oman Sea using a
           numerical model simulation and satellite data

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      Abstract: Abstract The aim of this study is the evaluation of sources of wind energy in coastal and offshore regions of the Persian Gulf and Oman Sea. A series of simulations by the Weather Research and Forecasting (WRF) model and the Cross-Calibrated Multi-Platform (CCMP) satellite data were used and compared against the observed data during the period 2013–2017. Results indicate overestimation by the WRF model in most of the stations and underestimation of wind speed by the CCMP for relatively strong winds. Maximum and minimum wind speeds in the Persian Gulf occur in its southeastern and northwestern parts, respectively. Maximum wind speed over the Oman Sea occurs in its northeastern, central, and southeastern parts. Maximum extractable wind energy is from the Oman Sea, especially in the eastern parts and also, in some parts of the Sultanate of Oman coastal area.
      PubDate: 2023-01-23
       
  • Analyzing wave energy potential near Essaouira coast in Morocco

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      Abstract: Abstract Waves generated by winds can transport a large amount of energy across the oceans with little loss. Many countries are currently developing promising technologies to harvest this energy by converting it into electricity. Studies dedicated to wave potential assessment are of primary importance for spotting the suitable locations to install wave energy converters as well as for designing wave energy devices. This paper presents an analysis of wave energy potential near Essaouira coast in Morocco, through the use of ocean wave hindcast data and high-resolution numerical modeling. The wave data were extracted from the European Integrated Ocean Waves for Geophysical and other Applications (IOWAGA) dataset for a period of 27 years. Results showed that the annual average power is about 23.72 kW/m which is equivalent to annual wave energy of 199.12 MWh/m. It was also found that the bulk of the wave energy is generated by waves with significant height between 1.5 and 3.0 m and mean wave energy periods between 10 and 12.5 s. The wave energy in the studied area exhibits a noticeable variability at different time scales. The numerical simulations enabled to identify three important locations suitable for wave energy exploitation. Among these potential sites, the one situated between Essaouira and Cape Sim presents many advantages and appears to be the most favorable.
      PubDate: 2023-01-18
       
  • Harmonic structure of wave loads on a surface piercing column in
           directionally spread and unidirectional random seas

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      Abstract: Abstract We investigate the harmonic structure of wave-induced loads on vertical cylinders with dimensions comparable to those used to support offshore wind turbines. Many offshore wind turbines are designed, so the structural resonance is two or three times the fundamental wave loading period, which may be excited by higher harmonics of wave loading. The suitability of a ‘Stokes-type’ model for force is examined. We analyse experimental data for unidirectional and directionally spread sea-states. We demonstrate that approximate harmonic components may be extracted from a random time series, using a novel signal processing method. The extracted harmonics are shown to follow a ‘Stokes-like’ model, where the higher harmonics in frequency are proportional to the n-th power of the linear inline force component and its Hilbert transform. Results show that the third harmonic component of force is fitted less well by this model, which is consistent with the literature. A key new result is that the harmonic coefficients for spread and unidirectional seas are nearly identical when fitted as powers of the linear inline force and its Hilbert transform. This finding has the potential to greatly simplify the process of generating harmonic data for new wavelength to cylinder and wavelength to depth ratios. This also implies that the size of the inline component of the \(n\textrm{th}\) harmonic for force in a directional sea relative to the same component in a unidirectional sea scales as \(\cos ^n \sigma _\theta \) , where \(\sigma _\theta \) is the rms directional spreading angle of the incident wave field. Hence, higher harmonics will be of less importance in directionally spread seas than unidirectional ones. We show that the computationally fast harmonic decomposition approach taken here can reproduce the shape and magnitude of the loading from non-breaking waves waves in a wide range of realistic unidirectional and directionally spread sea-states. The proposed force model has potential as an engineering tool for computationally fast prediction of nonlinear wave loads.
      PubDate: 2023-01-11
       
  • Vortex-induced vibration effect of extreme sea states over the structural
           dynamics of a scaled monopile offshore wind turbine

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      Abstract: Abstract In order to demonstrate the relevance of considering Vortex-Induced Vibrations (VIV) in the structural design of marine structures, this study proposes an alternative experimental and analytical approach in wet conditions to measure the fluid–structure interaction in the near field and quantify the viscous damping with measured structural and 3D hydrodynamic accelerations. It was demonstrated that VIV caused and incremented 5.00% of the structural damping coefficient, and the extreme wind loading increased 74% of the offshore monopile’s structural damping, demonstrating the relevance of the high non-linear hydrodynamics effects during selecting parameters into the structural design in offshore applications.
      PubDate: 2022-12-20
       
  • A methodology for designing light hull structure of ice class vessels

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      Abstract: Abstract Polar navigation requires more powerful ships with increased hull strengthening capable of overcoming the additional resistance presented by sea ice and able to withstand the impacts of the many ice formations that might appear. The increase in capability of a ship to overcome the resistance whilst moving through ice infested waters, plus the extra weight of its structure due to the higher strengthening, requires greater power. Consequently, the added requirements needed by ice-going vessels entail higher emissions of pollutants into the atmosphere, greater initial investment for shipbuilding and huge operational costs. Hull strengthening of ice class vessels is defined by a proper Classification Society in their rules, which tend towards conservative equations. This work describes a methodology to obtain lighter hull structures of polar vessels using an impact model of a ship against an ice floe, based on energy methods, and focussed on early stages of design. The hull structure of the bow region of an ice class ship is designed according to the Finnish-Swedish Ice Class Rules (FSICR) and both results of the weight of the ship’s bow calculated through direct calculation and current regulations are compared. Finally, some conclusions related with weight reduction are shown.
      PubDate: 2022-12-17
       
  • Adaptive coastal construction: designing amphibious homes to resist
           hurricane winds and storm surges

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      Abstract: Abstract Residents in coastal communities face multiple challenges when protecting their homes against extreme events. Hurricane winds and storm surges have caused widespread structural damage throughout eastern and southern communities in the United States and in other countries. This reality, coupled with existing research indicating rising sea levels and increased hurricane intensity has forced coastal communities to address the issue. One strategy being implemented and continuously refined is adaptive coastal structural design. This paper explores adaptive coastal design techniques for residential structures focusing on an amphibious housing and modular construction. Existing design concepts of coastal housing were reviewed and the advantages and disadvantages of various concepts as well the challenges were summarized. The amphibious home structural design concept presented includes a foundation base (concrete hull) with steel guide posts to resist lateral loads. The posts will prevent lateral movements while still allowing the house to float under an extreme flood event. The design loads applied to the amphibious home structure are based on a 100-year flood event with hurricane level wind forces and high storm surges following the Federal Emergency and Management Agency (FEMA) recommendations. Results of the analysis and design of the amphibious home structure showed that the design is feasible and sustainable in a 100-year flood event with minimum to minor structural damage. Additionally, a life-cycle cost analysis was conducted for a 50-year period comparing the costs of amphibious homes built in a New Jersey coastal community to the repair and restoration costs of existing homes damaged following a 100-year flood event. Cost analysis results showed that amphibious homes were about 10% lower than the cost of elevated homes and the associated repairs after a hurricane. This study also examined prefabricated modular amphibious homes as cost effective solution that can save time and reduce construction and maintenance costs.
      PubDate: 2022-12-07
       
  • Wave forces on a concave front pile-supported breakwater combined with
           wave screen under regular waves

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      Abstract: Abstract Most of the previous studies on the curved front Pile-Supported Breakwaters (PSB) dealt with the wave transmission past the structure and wave reflection. Fewer studies have reported wave-induced pressures on the front face of curved front PSB. The structure geometry and a limited number of pressure port locations are the uncertainties in integrating the measured dynamic pressures on the front face for obtaining the wave force. Therefore, in the present study, the wave-induced pressures, total forces, and moments on a circular cum parabola shape pile-supported breakwater (CPS-PSB) model are investigated through experiments carried out in a wave flume. The CPS-PSB is subjected to the action of regular waves in intermediate to deep-water conditions. The effect of integrating a tubular wave screen (TWS) on its seaside is also studied. It is found that the CPS-PSB experiences more vertical force for a higher submergence depth and the maximum vertical force is about 1.2 times the maximum horizontal force. The presence of TWS reduces the vertical force for the higher relative submergence, with a maximum reduction of about 50%, which still does not significantly reduce the horizontal force on CPS-PSB even though the pressures are reduced on the concave profile. There is also an increase in the magnitude of vertical forces in the presence of TWS with a reduction in h/d for long waves. The trend in the variation of the moment is similar to that of the horizontal force. The CPS-PSB in the absence of the wave screen is suggested as a better option for application in deeper waters.
      PubDate: 2022-11-29
       
 
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