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ENGINEERING (1208 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 5)
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Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
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Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
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African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
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Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
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Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 9)
Applied Clay Science     Hybrid Journal   (Followers: 4)
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Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
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Arid Zone Journal of Engineering, Technology and Environment     Open Access  
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Asian Engineering Review     Open Access  
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Asian Journal of Biotechnology     Open Access   (Followers: 8)
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Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
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Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
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BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
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Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
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BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 256)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 179)
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Composites Science and Technology     Hybrid Journal   (Followers: 197)
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Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Coastal Engineering Journal
  [SJR: 0.58]   [H-I: 26]   [4 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0578-5634 - ISSN (Online) 1793-6292
   Published by World Scientific Homepage  [118 journals]
  • Corrected First-Order Derivative ISPH in Water Wave Simulations
    • Abstract: Coastal Engineering Journal, Volume 59, Issue 01, March 2017.
      The smoothed particle hydrodynamics (SPH) method is a meshless numerical modeling technique. It has been applied in many different research fields in coastal engineering. Due to the drawback of its kernel approximation, however, the accuracy of SPH simulation results still needs to be improved in the prediction of violent wave impact. This paper compares several different forms of correction on the first-order derivative of ISPH formulation aiming to find one optimum kernel approximation. Based on four benchmark case analysis, we explored different kernel corrections and compared their accuracies. Furthermore, we applied them to one solitary wave and two dam-break flows with violent wave impact. The recommended method has been found to achieve much more promising results as compared with experimental data and other numerical approaches.
      Citation: Coastal Engineering Journal
      PubDate: 2017-03-15T10:50:00Z
      DOI: 10.1142/S0578563417500103
  • Reliability-Based Safety Analysis of a Seawall with Incomplete Information
           on Tsunamis
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      This study proposes a safety evaluation process for a prevention structure against tsunamis, in which the most updated guideline (i.e. FEMA P-646) is used as the deterministic analysis and a probabilistic approach is adopted to consider uncertainties involved. To overcome the incomplete data on Tsunamis, a Markov chain Monte Carlo (MCMC) simulation is developed to increase the quantity of historical data from Taiwan followed by the use of the least squares support vector machine (LS-SVM) to estimate the probability density function (PDF) of random variables. Based on the fragility analyses of the superstructure, substructure and entire system, if the wall thickness is below 4.45[math]m, the wall thickness is more likely to be the governing factor compared with the pile diameter. Conversely, the pile diameter would more likely be the dominating factor. When the pile size decreases from 75[math]cm to 65[math]cm, the threshold value will shift from 4.45[math]m to 3.85[math]m. In addition, when the wall thickness and height are greater, there is a greater likelihood of the failure probability being governed by the substructure. Based on historical records only, the probability of failure of the seawall is extremely low. Nevertheless, results shown here are in line with the engineering judgement and the computation procedure established in the present study can be used as a reference for performing safety analysis on tsunami structures with insufficient data.
      Citation: Coastal Engineering Journal
      PubDate: 2017-06-13T09:30:12Z
      DOI: 10.1142/S0578563417500140
  • An Equilibrium Transport Formula for Modeling Sedimentation of Dredged
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      The proposed formula for modeling sedimentation is based on a concept of hydrodynamic equilibrium in sediment transport. Hydrodynamic equilibrium occurs when the sediment transport is in a form of grain jumps with the distance traveled [math] smaller than the one established in the numerical modeling. A first-order upwind scheme FDM is applied. It provides the solution to equations describing changes in bathymetry in time and space coupled with simultaneous changes of bed sediment distribution. A clear-cut division of sediment transport into those during wave crest and wave trough is proposed. The results of bathymetry modeling coincided satisfactorily with the laboratory data. Moreover, the longer the experiments run, the more the results of measurements are compliant with the calculations. A certain time is needed for sediment transport to reach the hydrodynamic equilibrium, especially when the suspended load is significant. It is reached after going through the initial stages of bed level changes coupled with simultaneous changes of grain size distribution. The application of the model to field conditions shows its ability to predict sedimentation of dredged channels. Furthermore, the calculations show a good agreement with measured bed grain size distributions of sediment samples taken from the sites within the navigational channel of Łeba Port in Poland.
      Citation: Coastal Engineering Journal
      PubDate: 2017-06-13T09:30:12Z
      DOI: 10.1142/S0578563417500152
  • The Future Prediction of the One-Dimensional Topography of the Estuary
           Delta of the Shirakawa River
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      Predicting the long-term topographical change based on results of a time-slice experiment using a General Circulation Model (GCM) is difficult because actual change is a result of the continuum of events occurring in succession leading from the past to the future. We developed a one-dimensional topographical model of an estuary delta as the first step of assessing climate change effects. Three major effects, i.e. tidal flow, waves and sediment supply from the river, were included in this model. In order to estimate the sensitivity of these effects, simulations with virtual conditions were conducted. These simulations show equilibrium profiles that are close to the results of Roberts et al. 2000] “Predicting the profile of intertidal mudflats formed by cross-shore tidal currents,” Proc. Marine Sci. 3, 263–285.]. The simulation results were validated with observation data from the Shirakawa River delta. As a long-term prediction (about 37 years), the propagation of the rollover point was less than the actual data showed. The gradient of the subtidal zone was gentler than that observed. However, the short-term prediction (about 17 years) agrees with the observation data. These results show that old, unreliable, observation data used as a boundary condition significantly affects the reproducibility of the actual tidal flat profile. Finally, the effect of continuous Sea Level Rise (SLR) over 100 years from the present was investigated. As expected, the simulation results show a shift of the shoreline landward. The water depths in the intertidal and subtidal zones increase compared to a no-SLR condition. Therefore, the topset area grows as a consequence of SLR. Additionally, it was shown that future accumulation in the subtidal zone is reduced with SLR.
      Citation: Coastal Engineering Journal
      PubDate: 2017-06-02T08:18:31Z
      DOI: 10.1142/S0578563417400083
  • On the Role of Climate Change on Wind Waves Generated by Tropical Cyclones
           in the Gulf of Mexico
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      To generate projections of wave climate associated to tropical cyclones is a challenge due to their short historical record of events, their low occurrence, and the poor wind field resolution in General Circulation Models. Hence, synthetic tropical cyclones provide an alternative to overcome such limitations, improving robust statistics under both present and future climates. We use synthetic events to characterize present and future wave climate associated with tropical cyclones in the Gulf of Mexico. The NCEP/NCAR atmospheric reanalysis and the Coupled Model Intercomparison Project Phase 5 models NOAA/GFDL CM3 and UK Met Office HADGEM2-ES, were used to derive present and future wave climate under RCPs 4.5 and 8.5 scenarios. The GFDL model shows less bias in the present climate with respect to NCEP/NCAR results. Furthermore, the numerical results suggest an increase in wave activity for the future climate in the Caribbean Sea and Northern Gulf of Mexico, whereas some areas are expected to decrease the wave energy, as the stretch of the Gulf of Mexico between Yucatan and Southern Texas. The results have practical implications on the design of offshore structures. The 100-year design wave based on the present climate might result in under/over design of structures, owing to the lifespan of a structure that is within the future wave climate period.
      Citation: Coastal Engineering Journal
      PubDate: 2017-05-29T09:22:17Z
      DOI: 10.1142/S0578563417400010
  • An Improved Prediction for Wave Runup on a Circular Cylinder
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      Previous studies have applied various methods to analyze the wave runup on fixed columns, including linear and higher order diffraction theories and semi-empirical correlations. However, none of them seems to be adequate to accurately predict the wave runup over a full range of wave steepness and cylinder sizes when further compared with experimental data from the literature. The focus of this study is on a better semi-empirical formula for wave runup on a circular cylinder. We: (i) report on a set of experimental results obtained for a circular cylinder with various diameters in regular waves; (ii) evaluate the performance of existing theories or empirical equations using a full data set comprising new experimental results and results reported in the literature; and (iii) propose a new equation for predicting the wave runup on a fixed circular cylinder in regular waves. The proposed semi-empirical equation considers both the effects of wave scattering and wave nonlinearity and is able to estimate the runup of regular waves on a circular cylinder with significantly improved accuracy when tested with the full experimental data set.
      Citation: Coastal Engineering Journal
      PubDate: 2017-05-24T06:32:27Z
      DOI: 10.1142/S0578563417500139
  • The Influence of Climate Change on Coastal Erosion Vulnerability in
           Northeast Brazil
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      In this paper, an adapted methodology to evaluate coastal erosion vulnerability, which provides a basis for decision-making concerning risk management strategies, is described. The vulnerability evaluation was based on weighted indicators and assessed the vulnerability under different climate change scenarios. To generate the vulnerability index, dynamic processes, geo-indicators, and social and morphological parameters associated with modeled scenarios of sea level rise and predicted wave height changes were integrated. The study area included the sandy beaches in Pernambuco, NE Brazil, and was used to describe the practical application of this approach. Because the occupation of large sectors of the coastline was low, the vulnerability was concentrated in urbanized areas. The high-vulnerability sections of the coast were those with high population densities, high-rise buildings, induced coastal squeeze and hard engineering structures. The low-vulnerability beaches generally had low urbanization rates and well-conserved, resilient coastlines. Under future scenarios, the vulnerability of this coastal region will increase with sea level rise and wave height changes.
      Citation: Coastal Engineering Journal
      PubDate: 2017-05-24T06:32:27Z
      DOI: 10.1142/S0578563417400071
  • An Approximation to the Statistical Characteristics of Wind Waves in Front
           and from the Toe of the Structure to the Toe of the Crown of Nonovertopped
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      According to the main recommendations and technical criteria along the world, the design project of a breakwater must address the verification of the different failure modes that can affect the breakwater stability. This research focuses on the estimation of the statistical characteristics of the wind waves interacting with different breakwater types and their evolution from the toe of the structure to the toe of the crown. This knowledge is essential to calculate the reliability of the structure in its useful life. Partial standing wave patterns are likely to occur in front and along the section of the breakwater depending on their typology. Based on Rice’s theory of envelope amplitude, we present an approximate solution of the total wave height distribution in front of the breakwater. The experimental results in 2D confirmed that the incident, the reflected and the total wave height in front of the breakwater followed a Rayleigh distribution in which the parameter is the root-mean-square total wave height. Its value depends on the modulus and phase of the reflection coefficient. The probability density function of the total wave height evolves from a Rayleigh to a Weibull distribution, whose scale and shape parameters vary from the toe to the crown of the structure, and depend on the breakwater type, the relative grain diameter, and the relative water depth. The largest deviation from the Rayleigh distribution occurs at the toe of the crown. These findings are weakly dependent on the incident wave steepness, and are valid for narrow-banded incident wave trains, impinging perpendicularly on nonovertopped breakwaters with a steep frontface, which ensures the rapid evolution of the wave train. Then, each mode of failure that might occur in the breakwater section can be formally checked against the same incident wave height, but verified (calculated) with the actual wave height, locally transformed by the specific typology.
      Citation: Coastal Engineering Journal
      PubDate: 2017-05-16T07:15:54Z
      DOI: 10.1142/S0578563417500127
  • Projections of Future Beach Loss in Japan Due to Sea-Level Rise and
           Uncertainties in Projected Beach Loss
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      In this study, we projected the future beach loss in Japan’s 77 coastal zones due to sea-level rise (SLR) based on representative concentration pathway (RCP) scenarios and 21 models of the Coupled Model Intercomparison Project Phase 5 (CMIP5). The beach-loss curve for SLR in Japan was constructed, and uncertainties associated with SLR projections and sediment sizes were evaluated. Beach-loss rates in the future (2081–2100) were projected to be 62% for the ensemble mean RCP2.6 scenario, 71% for RCP4.5, 73% for RCP6.0, and 83% for RCP8.5, and the rates projected by the CMIP5 models for RCP4.5 ranged widely from 61% to 87%. The effect of the spatial distribution of SLR in each CMIP5 model on beach-loss rate in Japan is insignificant, while the effects of differences in the SLR values among RCP scenario and CMIP5 models are significant. The maximum uncertainties associated with sediment sizes (0.2–0.6[math]mm) against the same SLR were assessed to be 38%. Despite significant uncertainties in the projected beach loss, results in the near future (2046–2065) reveal that the beach-loss rates between 18% and 79% differed by 60% in the near future and between 28% and 96% differed by 70% in the future. For the worst case scenario in the near future, the projected beach width is less than 10[math]m in more than half of the 77 coastal zones, which would cause serious damage to coastal structures such as seawalls and revetments in beach areas. Thus, the development of effective measures to combat beach loss is critical for Japan’s coastal management.
      Citation: Coastal Engineering Journal
      PubDate: 2017-04-12T06:41:53Z
      DOI: 10.1142/S057856341740006X
  • Entrainment and Transport Dynamics of Shipping Containers in Extreme
           Hydrodynamic Conditions
    • Abstract: Coastal Engineering Journal, Ahead of Print.
      An experimental study was performed to examine multiple debris entrainment and transport in tsunami-like flow conditions. The study was performed in the Tsunami Wave Basin at Waseda University. The wave basin used a falling-head driven elongated solitary wave that broke at the edge of a horizontal apron to generate a tsunami-like surge. The debris, modeled as scaled-down (1:40 length scale) 20-foot standard shipping containers, was placed on the horizontal apron. The debris was tracked using a camera-based object tracking algorithm. The study examined the effect of the debris configuration, the number of debris, and orientation of debris on the entrainment and transport within the inundating surge. In examining the transport of multiple debris, the debris tended to be transported within the surge as an agglomeration. Using a previously derived model of debris the study determined experimentally derived coefficients to explain the difference in debris transport between various configurations.
      Citation: Coastal Engineering Journal
      PubDate: 2017-03-02T08:54:46Z
      DOI: 10.1142/S0578563417500115
  • Post-Disaster Survey of Storm Surge and Waves Along the Coast of Batanes,
           the Philippines, Caused by Super Typhoon Meranti/Ferdie
    • Authors: Yoshimitsu Tajima, John Phillip Lapidez, Jeane Camelo, Mizuka Saito, Yoshinao Matsuba, Takenori Shimozono, Dominic Bautista, Marjorie Turiano, Eric Cruz
      Abstract: Coastal Engineering Journal, Ahead of Print.
      This paper reports the post-disaster survey results of storm surge and waves due to Super Typhoon Meranti (local name: Ferdie), along the coastline of the province of Batanes, Philippines. The survey was conducted by a joint survey team of the University of Tokyo and University of the Philippines from 9 to 12 October 2016, about one month after the disaster. Water levels in the inundated area or runup heights were measured at 37 locations along the coast of the islands of Batan and Sabtang by interviewing local residents and by examining wave runup evidences remaining along the coast. Obtained runup and inundation levels showed significant variations along the coast of islands and higher levels were found on the coast facing north. Especially at Ivana, a small coastal community located at the southwestern tip of the island of Batan, the coast was covered by a convex-shaped fringing reef and observed inundation heights were locally concentrated behind the peak of the convex-shaped reef.
      Citation: Coastal Engineering Journal
      PubDate: 2017-01-10T08:36:22Z
      DOI: 10.1142/S0578563417500097
  • Stokes Drift Estimation for Sea States Based on Long-Term Variation of
           Wind Statistics
    • Authors: Dag Myrhaug
      Abstract: Coastal Engineering Journal, Ahead of Print.
      This paper provides a simple analytical method which can be used to give estimates of the Stokes drift within sea states based on long-term variation of wind conditions. This is exemplified by using long-term wind statistics from the Northern North Sea and the Northwest Shelf of Australia. The paper presents the mean values and the standard deviations of the surface Stokes drift and the Stokes transport. Based on, for example, global wind statistics, the present analytical results can be used to make estimates of the Stokes drift.
      Citation: Coastal Engineering Journal
      PubDate: 2016-12-05T10:50:12Z
      DOI: 10.1142/S0578563417500085
  • Boussinesq-Type Modeling of Sediment Transport and Coastal Morphology
    • Authors: Georgios Th. Klonaris, Constantine D. Memos, Nils K. Drønen, Rolf Deigaard
      Abstract: Coastal Engineering Journal, Ahead of Print.
      A two horizontal dimensional compound model is developed to simulate coastal sediment transport and bed morphology evolution due to wave action. The wave module is a higher-order Boussinesq-type model. The bed load in the surf zone is computed from an advanced semi-empirical formula while the suspended load can be calculated through the solution of the advection-diffusion equation for the sediment or alternatively from a simplified formula. The estimation of the sediment transport in the swash zone is based on the ballistic theory. The unified sediment transport module is valid under combined waves and currents including the wave asymmetry and phase-lag effects. The bathymetry is updated through the sediment conservation equation and the morphological accelerator factor technique accounts for extended simulation time. The model is validated against a number of short-term tests in one horizontal dimension. The response is generally good with most of the morphological features being reproduced in the cross-shore direction. A comparison between various sediment transport formulae and a sensitivity analysis are also performed illustrating the need for inclusion of the phase-lag effects.
      Citation: Coastal Engineering Journal
      PubDate: 2016-11-23T03:03:10Z
      DOI: 10.1142/S0578563417500073
  • A Neural Network Tool for Predicting Wave Reflection, Overtopping and
    • Authors: Sara Mizar Formentin, Barbara Zanuttigh, Jentsje W. van der Meer
      Abstract: Coastal Engineering Journal, Ahead of Print.
      This contribution presents a new Artificial Neural Network (ANN) tool that is able to predict the main parameters describing the wave-structure interaction processes: the mean wave overtopping discharge ([math]), the wave transmission and wave reflection coefficients ([math] and [math]). This ANN tool is trained on an extended database (based on the CLASH database) of physical model tests, including at least one of the three output parameters, for a total number of nearly 18,000 tests. The selected 15 nondimensional ANN input parameters represent the most significant effects of the structure type (geometry, amour size and roughness) and of the wave attack (wave steepness, breaking, shoaling, wave obliquity). The model can be used for design purposes, leading to a greater accuracy than existing formulae and similar tools for complex geometries for the prediction of [math] and [math], and it has a similar accuracy as the CLASH ANN for predicting [math].
      Citation: Coastal Engineering Journal
      PubDate: 2016-11-23T03:03:09Z
      DOI: 10.1142/S0578563417500061
  • A Numerical Study on Hydrodynamics of Standing Waves in Front of Caisson
           Breakwaters with WCSPH Model
    • Authors: Abbas Yeganeh-Bakhtiary, Hamid Houshangi, Fatemeh Hajivalie, Soroush Abolfathi
      Abstract: Coastal Engineering Journal, Ahead of Print.
      In this paper, a two-dimensional Lagrangian model based on the weakly compressible smoothed particle hydrodynamics (WCSPH) was developed to explore the hydrodynamics of standing waves impinge on a caisson breakwater. The developed model is validated against experimental data and applied then to analyze the wave horizontal velocity in front of a vertical caisson. The effect of wall steepness was investigated in terms of the steady streaming pattern due to generation of fully to partially standing waves. The numerical results indicated that the partially standing waves generated in front of the sloped caisson change the pattern of steady streaming. For the vertical caisson, the velocity component of recirculating cells increased in front of the vertical wall; whereas, for the sloped caisson it decreased from the sloped wall with reducing the wall steepness. In addition, near the milder sloped wall the intensity of velocity component is higher, which is an important parameter in scour process in front of caisson breakwater.
      Citation: Coastal Engineering Journal
      PubDate: 2016-11-23T03:03:09Z
      DOI: 10.1142/S057856341750005X
  • Effects of a Macro-Roughness Element on Tsunami Wave Amplification,
           Pressures, and Loads: Physical Model and Comparison to Japanese and US
           Design Equations
    • Authors: Tori Tomiczek, Adi Prasetyo, Nobuhito Mori, Tomohiro Yasuda, Andrew Kennedy
      Abstract: Coastal Engineering Journal, Ahead of Print.
      Experiments were conducted at a 1:20 length scale in a large tsunami flume to measure wave evolution and pressures on and around structural elements. The water surface profiles of waves propagating across a bare beach were compared with those recorded in front of an onshore obstacle representing an urban macro-roughness element. The addition of a structure significantly changed the water surface profile for broken waves: the water surface amplification in the presence of a macro-roughness element reached seven times the bare-earth water surface elevation. Estimated pressures from design equations were calculated using recommended inputs and compared with pressures recorded by gauges installed on the structural elements. Design equations showed good agreement for non-breaking wave pressures but underestimated peak pressures for breaking waves. Likewise, force integrations of measured pressures on the experimental specimen indicated that design equations may underestimate loads due to waves that break offshore and propagate across a beach as a turbulent bore. The time-integrated pressure impulse was shown to be less sensitive to wave characteristics than the peak recorded pressures. Time-averaged loading curves were also developed for different average periods.
      Citation: Coastal Engineering Journal
      PubDate: 2016-11-09T08:31:38Z
      DOI: 10.1142/S0578563417500048
  • Upstream Propagation of Surges and Bores: Free-Surface Observations
    • Authors: Xinqian Leng, Hubert Chanson
      Abstract: Coastal Engineering Journal, Ahead of Print.
      In a free-surface flow, a sudden increase in water depth induces a positive surge, also called compression wave or bore. Herein a physical study was conducted in relatively large-size rectangular channel with a smooth bed. The upstream propagation of breaking and undular bores were investigated with a broad range of Froude numbers Fr1 ranging from 1.1 to 2.3. Both instantaneous and ensemble-averaged free-surface measurements were performed nonintrusively. The observations showed the occurrence of undular bores for [math] to 1.3, breaking bores for [math] to 1.5, and breaking bores with secondary waves for 1.2–[math]–1.5. The propagation of a breaking bore was associated with an upward free-surface curvature immediately before the roller toe for [math], and an abrupt increase in free-surface elevation with the passage of the breaking roller. The propagation of undular bores was characterized by a smooth upward free-surface curvature, followed by a smooth first wave crest and a train of secondary quasi-periodic undulations. For all tidal bores, the passage of the bore front was always associated with large free-surface fluctuations, occurring slightly after the arrival of the front. During the generation process, the positive surge formed very rapidly and the surge celerity increased very rapidly, reaching maximum values excess of the fully-developed bore celerity. With increasing time, the surge decelerated and the bore propagated at an early constant celerity for [math].
      Citation: Coastal Engineering Journal
      PubDate: 2016-10-25T03:41:50Z
      DOI: 10.1142/S0578563417500036
  • Cross-Shore Damage Variation of Wooden Blocks in Swash Zone on Sand Beach
    • Authors: Xavier Chávez Cárdenas, Nobuhisa Kobayashi
      Abstract: Coastal Engineering Journal, Ahead of Print.
      Shore protection projects require the prediction of coastal storm damage and economic loss but the damage processes are not well understood. An exploratory experiment consisting of 11 tests was conducted in a wave flume with a sand beach to examine the movement of 10 wooden blocks (floatable objects) placed on the foreshore and berm as well as on short and long pilings. The still water level was varied to create accretional and erosional profile changes. The cross-shore wave transformation on the beach and the wave overtopping and overwash of the berm were measured in 101 runs of irregular waves where each run lasted 400[math]s. The initial block elevation above the sand surface had little effect on the hydrodynamics, sediment transport, and profile evolution in this experiment with widely-spaced blocks. The block floating and sliding on the sand surface and the block falling from the pilings depended on the swash hydrodynamics and block clearance above the foreshore and berm whose profile varied during each test. A simple probabilistic model is developed to estimate the immersion, sliding, and floating probabilities for the blocks in the swash zone. The predicted probabilities are compared with the observed cross-shore variation of the block response on or above the accretional and erosional beach profiles. The accurate prediction of the block response is shown to require the accurate prediction of the beach profile change.
      Citation: Coastal Engineering Journal
      PubDate: 2016-10-19T10:07:29Z
      DOI: 10.1142/S0578563417500012
  • Experimental Study of Local Scour Beneath Two Tandem Pipelines in Steady
    • Authors: Qin Zhang, Scott Draper, Liang Cheng, Ming Zhao, Hongwei An
      Abstract: Coastal Engineering Journal, Ahead of Print.
      This paper presents an experimental investigation of local scour beneath two identical pipelines placed in a tandem arrangement. Changes in the equilibrium scour depth and time scale of scour due to steady currents are explored for different spacing between the pipelines (defined in terms of a gap ratio [math] under both live bed and clear water conditions. It is found that the smaller the gap ratio, the larger the interaction between the two tandem pipelines. More specifically, when [math] it is found that (i) the equilibrium scour depth beneath the downstream pipeline is larger than that below the upstream pipe, and (ii) the equilibrium scour depth for both pipelines is larger than for a single pipeline in isolation. Alternatively for [math] it is found that the equilibrium scour depth beneath the upstream pipeline can be deeper than the downstream pipeline, however both pipelines have a depth that is not significantly different to the equilibrium depth for an isolated pipeline. In terms of the time scale of scour it is observed that the downstream pipeline has a similar or larger time scale than the upstream pipeline over all gap ratios analyzed. In comparison to an isolated pipeline the time scale for both tandem pipelines is larger when [math], whilst for [math] and [math], respectively, the upstream and downstream pipelines have a similar time scale to an isolated pipeline. The trends in the experimental results are shown to agree well with recent numerical results in the literature. Empirical formulas for predicting the time development of scour beneath two tandem pipelines are proposed.
      Citation: Coastal Engineering Journal
      PubDate: 2016-10-19T10:07:28Z
      DOI: 10.1142/S0578563417500024
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