Relevant bibliographies by topics / Wave contours

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Wave contours'

Author: Grafiati
Published: 5 June 2025
Last updated: 2 August 2025

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Journal articles on the topic "Wave contours"

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Mikulić, Antonio, and Joško Parunov. "Environmental Contours in the Adriatic Sea for Design and Analysis of Marine Structures." Journal of Marine Science and Engineering 11, no. 5 (2023): 899. http://dx.doi.org/10.3390/jmse11050899.

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The environmental contours represent an approach for defining extreme environmental conditions, resulting in extreme responses of marine structures with a given return period. Over the past decade, an increasing number of studies have been developed dealing with the methods for defining environmental contours and enhancing their practical application in different marine environments. In the present study, environmental contours describing significant wave heights and peak wave periods are created for the Adriatic Sea. This small semi-enclosed sea basin within the Mediterranean Sea encounters i
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Bach, Joachim S. "ENVIRONMENTAL CONTOUR ESTABLISHMENT BASED ON OPENLY AVAILABLE EMODNET WAVE AND WIND DATA FOLLOWING HEFFERNAN AND TAWN METHODOLOGIES." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 37. http://dx.doi.org/10.9753/icce.v37.waves.37.

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In this paper, I present methodologies and routines for inference of environmental contours based on openly available data from the European EMODnet service, specifically wind and wave timeseries from oil platform 6200146. The conditional marginal distribution models, known as environmental contours, is established based on measured wind and wave heights, at platform 6200146 located in the North Sea. The data is provided through the openly available data platform, EMODnet. The environmental contour model is established by fitting univariate distributions to each data-series independently, wher
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Bueh, Cholaw, and Zuowei Xie. "An Objective Technique for Detecting Large-Scale Tilted Ridges and Troughs and Its Application to an East Asian Cold Event." Monthly Weather Review 143, no. 12 (2015): 4765–83. http://dx.doi.org/10.1175/mwr-d-14-00238.1.

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Abstract The present study identified the large-scale tilted ridge and trough (LSTR and LSTT, respectively) axes of the midtropospheric circulation over mid- and high-latitude regions using an objective identification technique that has not previously been applied. In this method, the identification procedure classified contours of 500-hPa height (Z500) fields into three types: the circumpolar wavy contour, the circumpolar contour containing the meridionally overturned (or wave breaking) part, and the locally closed contour. The ridge and trough points were defined on these three types of cont
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Eckert, Aubrey, Nevin Martin, Ryan G. Coe, Bibiana Seng, Zacharia Stuart, and Zachary Morrell. "Development of a Comparison Framework for Evaluating Environmental Contours of Extreme Sea States." Journal of Marine Science and Engineering 9, no. 1 (2020): 16. http://dx.doi.org/10.3390/jmse9010016.

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Environmental contours of extreme sea states are often utilized for the purposes of reliability-based offshore design. Many methods have been proposed to estimate environmental contours of extreme sea states, including, but not limited to, the traditional inverse first-order reliability method (I-FORM) and subsequent modifications, copula methods, and Monte Carlo methods. These methods differ in terms of both the methodology selected for defining the joint distribution of sea state parameters and in the method used to construct the environmental contour from the joint distribution. It is often
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Wrang, Linus, Eirini Katsidoniotaki, Erik Nilsson, Anna Rutgersson, Jesper Rydén, and Malin Göteman. "Comparative Analysis of Environmental Contour Approaches to Estimating Extreme Waves for Offshore Installations for the Baltic Sea and the North Sea." Journal of Marine Science and Engineering 9, no. 1 (2021): 96. http://dx.doi.org/10.3390/jmse9010096.

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At the stage of design load analysis for offshore installations such as wave energy systems, a critical step is the determination of environmental cases to be evaluated for the definition of the characteristic design load. A commonly used methodology for load case selection, applied in multiple studies and recommended by technical specifications and guidelines, is the environmental contour approach. Here, 50-year environmental contours were generated for four study sites located in the North Sea, Skagerrak and the Baltic Sea by considering both observations and hindcast (model) data. For the c
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Rasche, Christoph. "Signaling contours by neuromorphic wave propagation." Biological Cybernetics 90, no. 4 (2004): 272–79. http://dx.doi.org/10.1007/s00422-004-0470-x.

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Takovitskii, S. А. "Conical bodies with star-shaped transverse contour having the minimum wave drag." Известия Российской академии наук. Механика жидкости и газа, no. 1 (August 27, 2024): 123–30. http://dx.doi.org/10.31857/s1024708424010097.

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The problem of constructing the transverse contour of a conical body having the minimum wave drag in the range of supersonic velocities provided that the length and the volume are preserved is considered. A cone is taken as the initial body, an assumption about locality of the relation between variations in the geometric parameters and the pressure on the surface is made, and the quadratic approximation of this relation is used. The found solution is compared with the results obtained within the framework of the Newton model. These solutions are proposed to combine being based on the assumptio
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Kozlovsky, A. E., V. V. Safargaleev, and W. B. Lyatsky. "The transformation of magnetoacoustic waves into Alfvén waves inside the magnetosphere." Annales Geophysicae 12, no. 10/11 (1994): 1022–26. http://dx.doi.org/10.1007/s00585-994-1022-3.

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Abstract. A mechanism for the transformation of a magnetoacoustic wave into an Alfvén wave is proposed. During the compression of the magnetosphere by the solar wind the inner edge of the plasma sheet and the contours of B=const move in different ways. In the case of asymmetrical compression, the contours of B=const will cross the inner edge of the plasma sheet. To close the drift currents - that flow in the plasma sheet along the contours of B=const - the appearance of the field-aligned currents is necessary. This appearance corresponds to the generation of the Alfvén wave.
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Hnath-Chisolm, Theresa, and Arthur Boothroyd. "Speechreading Enhancement by Voice Fundamental Frequency." Journal of Speech, Language, and Hearing Research 35, no. 5 (1992): 1160–68. http://dx.doi.org/10.1044/jshr.3505.1160.

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Recognition of words in sentences of known topic was measured in normally hearing adults via speechreading alone and speechreading supplemented with auditory presentation of signals intended to convey variations of voice fundamental frequency (F o ) over time. Three signals were used: (a) the low-pass filtered output of an electroglottograph (unprocessed F o ), (b) a constant amplitude sine wave whose instantaneous frequency was intended to equal that of F o (processed F o ), and (c) the same sine wave restricted to a small number of discrete frequency steps (quantized F o ). As the number of
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Vada, Torgeir. "A numerical solution of the second-order wave-diffraction problem for a submerged cylinder of arbitrary shape." Journal of Fluid Mechanics 174 (January 1987): 23–37. http://dx.doi.org/10.1017/s0022112087000028.

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The first- and second-order wave-diffraction problems are solved for a submerged cylinder of arbitrary shape by the integral-equation method based on Green's theorem. The integral equation is solved by an element method using cubic splines. The first- and second-order force components, transmission and reflection coefficients are presented for two fifferent contours. The results for the circular contour are compared with experimental results.
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Dissertations / Theses on the topic "Wave contours"

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Katsidoniotaki, Eirini. "Extreme wave conditions and the impact on wave energy converters." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-441043.

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The amount of energy enclosed in ocean waves has been classified as one of the most promising renewable energy sources. Nowadays, different wave energy conversion (WEC) systems are being investigated, but only a few concepts have been operated in a sea environment. One of the largest challenges is to guarantee the offshore survivability of the devices in extreme wave conditions. However, there are large uncertainties related to the prediction of extreme wave loads on WECs.  Highfidelity computational fluid dynamics (CFD) simulations can resolve nonlinear hydrodynamic effects associated with wa
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Samarawickrama, Saman Priyantha. "Long-term tide and wave-induced sedimentation at a lagoon entrance." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325317.

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Martinez, Pujol Oriol. "Template tracking of articulated objects using active contours." Doctoral thesis, Universitat Pompeu Fabra, 2016. http://hdl.handle.net/10803/373919.

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En aquesta dissertació es fusionen dos dels temes tradicionals de la Visió per Computador: la segmentació i el seguiment d'objectes. Per a la segmentació s'utilitzen mètodes basats en "Active Contours (AC)" i per al seguiment mètodes basats en "templates" o patrons. El nostre objectiu és combinar-los per tal de crear mètodes robustos i eficients a l'hora de segmentar i seguir objectes articulats o deformables. Al capítol 1 es revisa el marc teòric dels AC i s'aplica en la segmentació de cossos i amenaces (com explosius o pistoles) que estan amagades darrera la roba en imatges MilliMeter-Waves
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Payne, Rupert Alistair. "Pulse transit time and the pulse wave contour as measured by photoplethysmography : the effect of drugs and exercise." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/5950.

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Photoplethysmography (PPG) is a simple means of measuring the pulse wave in humans, exploitable for the purposes of timing the arrival of the pulse at a particular point in the arterial tree, and for pulse contour analysis. This thesis describes a methodology for measuring arterial pulse transit time (PTT) from cardiac ejection to pulse arrival at the finger. It describes the effect on PTT of drug and exercise induced changes in BP. The nature of the relationship between the PPG and arterial pressure is also examined, and the PTT technique extended to assessment of conduit vessel pulse wave ve
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Smith, Robert K. "The contour-advective semi-Lagrangian hybrid algorithm approach to weather forecasting and freely propagating inertia-gravity waves in the shallow-water system." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/716.

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Drummond, Russell S. "The effect of single nucleotide polymorphisms of oxidative stress genes and low grade inflammation upon pulse wave contour analysis, a useful non invasive, intermediate vascular phenotype." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/1332/.

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Cardiovascular disease remains a major cause of mortality and morbidity and is underpinned by Oxidative stress, within which, inactivation of nitric oxide (NO) by superoxide (SO) and other reactive oxygen species is characteristic. Two major enzyme systems are implicated within oxidative stress; NAD(P)H oxidase and endothelial nitric oxide synthase (eNOS). eNOS generates NO while at the same time, and within the same cells, NAD(P)H plays a powerful role in the generation of SO. Evidence is accumulating that polymorphisms of the genes encoding these enzyme systems may play an important role in
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Cebrecos, Ruiz Alejandro. "Transmission, reflection and absorption in Sonic and Phononic Crystals." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/56463.

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[EN] Phononic crystals are artificial materials formed by a periodic arrangement of inclusions embedded into a host medium, where each of them can be solid or fluid. By controlling the geometry and the impedance contrast of its constituent materials, one can control the dispersive properties of waves, giving rise to a huge variety of interesting and fundamental phenomena in the context of wave propagation. When a propagating wave encounters a medium with different physical properties it can be transmitted and reflected in lossless media, but also absorbed if dissipation is taken into account.
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Collin, Marie-France. "Analyse quantitative de visualisations d'écoulements par la mise au point d'une méthode de traitement d'images : application à la détermination du champ des vitesses." Poitiers, 1989. http://www.theses.fr/1989POIT2270.

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Developpement et essai d'une chaine de traitement et d'analyse d'images pour l'exploitation des cliches de visualisation d'ecoulement, obtenus par la technique des traceurs solides. Analyse des images numerisees par une methode de codages de contour. On considere la configuration des traces. Les traces juxtaposees sont identifiees et segmentees. Application a 4 cliches visualisant la brusque mise en translation d'un profil naca0012 en incidence fixe
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Shi, Ping. "Photoplethysmography in noninvasive cardiovascular assessment." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/5399.

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The electro-optic technique of measuring the cardiovascular pulse wave known as photoplethysmography (PPG) is clinically utilised for noninvasive characterisation of physiological components by dynamic monitoring of tissue optical absorption. There has been a resurgence of interest in this technique in recent years, driven by the demand for a low cost, compact, simple and portable technology for primary care and community-based clinical settings, and the advancement of computer-based pulse wave analysis techniques. PPG signal provides a means of determining cardiovascular properties during the
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Lin, Te-yuan, and 林德愿. "The Refraction of Waves Propagating on Bottom with Concentric Circular Contours." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/21017092242506843919.

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碩士<br>國立中山大學<br>海洋環境及工程學系研究所<br>93<br>This study discusses the three-dimensional refraction of progressive wave trains propagating over a bottom of circular concentric contours and the results are expressed in a polar coordinate. First, a general differential formulation of refraction is derived via three different methods: by transferring from its original Cartesian form to the polar coordinate, by applying the Fermat’s principle in polar coordinate, and by applying the conservation of waves in polar coordinate. All three approaches give the same governing equation; hence, its correctness is
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Books on the topic "Wave contours"

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Ludu, Andrei. Nonlinear Waves and Solitons on Contours and Closed Surfaces. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22895-7.

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Ludu, Andrei. Nonlinear Waves and Solitons on Contours and Closed Surfaces. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14641-1.

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Ludu, Andrei. Nonlinear waves and solitons on contours and closed surfaces. Springer, 2007.

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Ludu, Andrei. Nonlinear waves and solitons on contours and closed surfaces. Springer, 2007.

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service), SpringerLink (Online, ed. Nonlinear Waves and Solitons on Contours and Closed Surfaces. 2nd ed. Springer Berlin Heidelberg, 2012.

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1938-, Georges T. M., Jones R. Michael 1937-, and Wave Propagation Laboratory, eds. CONPLT, a program to generate contours from HARPO/HARPA environmental models. Wave Propagation Laboratory, U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1992.

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Orlik, Lyubov', and Galina Zhukova. Operator equation and related questions of stability of differential equations. INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1061676.

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The monograph is devoted to the application of methods of functional analysis to the problems of qualitative theory of differential equations. Describes an algorithm to bring the differential boundary value problem to an operator equation. The research of solutions to operator equations of special kind in the spaces polutoratonny with a cone, where the limitations of the elements of these spaces is understood as the comparability them with a fixed scale element of exponential type. Found representations of the solutions of operator equations in the form of contour integrals, theorems of existe
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Lause, Mark A. Prologue: Old World Contours. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252036552.003.0001.

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This prologue discusses the proliferation of revolutionaries and revolutionary secret societies in America in the wake of the revolts of 1848–49. Americans initially shared with Europe the mechanisms by which republicans sought to reconstruct their civilizations. Masonry, the earliest model of a secular voluntary association, emerged from the Old World Enlightenment with unavoidable implications for the political organizations built in its wake and for the revolutionary movements of the eighteenth century. For the defenders of the status quo, the membership, influence, and agendas of secret so
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Ludu, Andrei. Nonlinear Waves and Solitons on Contours and Closed Surfaces. Springer, 2014.

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Nonlinear Waves and Solitons on Contours and Closed Surfaces. Springer, 2007.

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Book chapters on the topic "Wave contours"

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Arnold, V. I. "Projections of surfaces, and singularities of apparent contours." In Singularities of Caustics and Wave Fronts. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-3330-2_6.

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Clarindo, G., and C. Guedes Soares. "Extreme wave contours for floating wind turbine sites in the Atlantic area." In Trends in Renewable Energies Offshore. CRC Press, 2022. http://dx.doi.org/10.1201/9781003360773-12.

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Mikulić, A., and J. Parunov. "Environmental contours and extreme vertical wave bending moments of ships in the North Atlantic." In Advances in Maritime Technology and Engineering. CRC Press, 2024. http://dx.doi.org/10.1201/9781003508779-31.

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Clarindo, G., and C. Guedes Soares. "Estimation of environmental wave contours along the Portuguese continental coast using the Burr distribution." In Advances in Maritime Technology and Engineering. CRC Press, 2024. http://dx.doi.org/10.1201/9781003508779-66.

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Stark, R., and B. Wagner. "Mach disk shape in truncated ideal contour nozzles." In Shock Waves. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85181-3_28.

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Truong, N. K., M. P. Hardy, and M. A. F. Kendall. "The effects of diaphragm rupture and particle loading in contoured shock tubes for vaccine delivery." In Shock Waves. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-27009-6_109.

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Walsh, E. J., D. W. Hancock, D. E. Hines, and J. E. Kenney. "Remote Sensing of Directional Wave Spectra Using the Surface Contour Radar." In Wave Dynamics and Radio Probing of the Ocean Surface. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-8980-4_31.

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Fedotov, A. A., A. S. Akulova, S. A. Akulov, and M. A. Reshetnikova. "Novel spectral approach for pulse waves contour analysis." In IFMBE Proceedings. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4220-1_4.

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O'Rourke, Michael, and Audrey Adji. "Contour of Pressure and Flow Waves in Arteries." In McDonald's Blood Flow in Arteries, 7th ed. CRC Press, 2022. http://dx.doi.org/10.1201/9781351253765-9.

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Zhou, Hong, and Guodong Zhou. "A Crack Defect Detection Method Based on Improved Contour Wave Transformation." In Learning and Analytics in Intelligent Systems. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-85952-6_24.

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Conference papers on the topic "Wave contours"

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Armstrong, Curtis, Christopher Chin, Irene Penesis, and Yuriy Drobyshevski. "Sensitivity of Vessel Responses to Environmental Contours of Extreme Sea States." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41680.

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A comparative study of two methods for the generation of the environmental contours is presented investigating the sensitivity of the predicted extreme vessel responses to the type of the contour lines. Two approaches for the generation of environmental contours of the significant wave height and peak period are compared: the Inverse First Order Reliability Method (IFORM) and Constant Probability Density (CPD) approach. Case studies include several global responses of a ship-shaped weather-vaning vessel and a semisubmersible platform. The case studies reveal that the differences between the IF
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Vanem, Erik, and Elzbieta M. Bitner-Gregersen. "Alternative Environmental Contours for Marine Structural Design: A Comparison Study." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23252.

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A new approach to estimating environmental contours has recently been proposed, where the contours are estimated in the original physical space by Monte Carlo simulations from the joint distribution directly rather than applying the Rosenblatt transformation. In this paper, the new and the traditional approach to estimating the contours are presented and the assumptions on which they are based are discussed. The different results given by these two methods are then compared in a number of case studies. Simultaneous probability density functions are fitted to the joint distribution of significa
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Haselsteiner, Andreas F., Aljoscha Sander, Jan-Hendrik Ohlendorf, and Klaus-Dieter Thoben. "Global Hierarchical Models for Wind and Wave Contours: Physical Interpretations of the Dependence Functions." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18668.

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Abstract Applications such as the design of offshore wind turbines requires the estimation of the joint distribution of variables like wind speed, wave height and wave period. The joint distribution can then be used, for example, to define design load cases using the environmental contour method. Often the joint distribution is described using so-called global hierarchical models. In these models, one variable is taken as independent and the other variables are modelled to be conditional on this variable using particular dependence functions. In this paper, we propose to use dependence functio
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Gramstad, Odin, Erik Vanem, and Elzbieta Bitner-Gregersen. "Uncertainty of Environmental Contours due to Sampling Variability." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77810.

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Environmental contours are commonly applied in design of marine structures to identify extreme environmental conditions that may give rise to extreme loads and responses. Recently, there has been some focus on the fact that different methods exist for establishing such contours, and that in some cases significant differences may be obtained from the different methods. In this study, we address another uncertainty related to the calculation of environmental contours, namely the uncertainty due to sampling variability when constructing environmental contours based on metocean data of finite samp
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Zhao, Yuliang, Sheng Dong, Zihao Yang, and Lance Manuel. "Estimating Design Loads for Floating Structures Using Environmental Contours." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18453.

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Abstract To ensure acceptable operation and/or survival of floating structures in extreme conditions, nonlinear time-domain simulations are often used to predict the structural response at the design stage. An environmental contour (EC) is commonly employed to identify critical sea states that serve as input for numerical simulations to assess the safety and performance of marine structures. In many studies, marginal and conditional distributions are defined to construct bivariate joint probability distributions for variables such as significant wave height and zero-crossing period; then, envi
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Derbanne, Quentin, and Guillaume de Hauteclocque. "A New Approach for Environmental Contour and Multivariate De-Clustering." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95993.

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Abstract When the long term behaviour of a floating unit is assessed, the environmental contour concept is often applied together with IFORM (Inverse First Order Reliability Method). This approach avoids direct computation on all sea-states, which is computationally very demanding, and most often simply not feasible. Instead, only a few conditions (the contour) are assessed and results in an accurate estimate of the long term extreme. However, most of available methods to derive the contour require the knowledge of the joint distribution of the different random variables (waves, wind, current.
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Kuehnlein, Walter L., Gu¨nther F. Clauss, and Janou Hennig. "Tailor Made Freak Waves Within Irregular Seas." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28524.

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The paper presents a nonlinear technique for generating high and highest freak waves by using deterministic wave packets which are also embedded into irregular seas. First, the technique is developed for small water elevations with a linear description of the wave. Afterwards the method is extended to a nonlinear description based on the introduction of a “wave information” which includes the (linear) information of waves as Fourier Transforms. Combined with a modified wave celerity (information speed) the propagation of high waves can be developed by using Stokes higher order solutions or sem
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Vanem, Erik, and Bingjie Guo. "Comparison of the Environmental Contour Method and Response-Based Analysis Using Response Emulator for Estimating Extreme Ship Responses." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95098.

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Abstract Environmental contours are often applied in probabilistic structural reliability analysis to identify extreme environ-mental conditions that may give rise to extreme loads and responses. They facilitate approximate long term analysis of critical structural responses in situations where computationally heavy and time-consuming response calculations makes full long-term analysis infeasible. The environmental contour method identifies extreme environmental conditions that are expected to give rise to extreme structural response of marine structures. The extreme responses can then be esti
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Narisetti, Raj K., Massimo Ruzzene, and Michael J. Leamy. "Wave Propagation in Two-Dimensional Nonlinear Periodic Lattices." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86279.

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This paper investigates wave propagation in two-dimensional nonlinear periodic structures subject to point harmonic forcing. The infinite lattice is modeled as a springmass system consisting of linear and cubic-nonlinear stiffness. The effects of nonlinearity on harmonic wave propagation are analytically predicted using a novel perturbation approach. Response is characterized by group velocity contours (derived from phase-constant contours) functionally dependent on excitation amplitude and the nonlinear stiffness coefficients. Within the pass band there is a frequency band termed the “caustic
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Miao, Qingqing, and Ying Min Low. "Modified Environmental Contours Approach for Long-Term Extreme Response Prediction of Marine Risers." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78640.

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Abstract Accurate prediction of the long-term extreme response of offshore structures is challenging for complex systems under varying marine environments. The long-term uncertainties come from the varying environmental parameters such as significant wave height and spectral peak period, while the short-term uncertainties are due to the random wave amplitudes and phases. The conventional environmental contour lines method provides a fast approximate way to estimate the extreme response by performing simulations along the environmental contours. However, the method is unconservative if the shor
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Reports on the topic "Wave contours"

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O’Dea, Annika, and Katherine Brodie. Analysis of beach cusp formation and evolution using high‐frequency 3D lidar scans. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48781.

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Beach cusp characteristics were explored using 15 months of 3D lidar scans collected hourly at the Duck, NC, Field Research Facility. Fourier analyses performed on lidar-derived beach elevation contours generated spatial cusp spectra. Active cusp events identified from the location and magnitude of each spectrum’s peak were used to evaluate conditions during cusp formation and evolution. Cusps primarily developed during normally-incident, long-period, low-energy wave conditions with low frequency spread and reflective beach conditions. Often, however, persistent upper-beach cusps lasted days t
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Ray, Laura, Madeleine Jordan, Steven Arcone, et al. Velocity field in the McMurdo shear zone from annual ground penetrating radar imaging and crevasse matching. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42623.

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The McMurdo shear zone (MSZ) is strip of heavily crevassed ice oriented in the south-north direction and moving northward. Previous airborne surveys revealed a chaotic crevasse structure superimposed on a set of expected crevasse orientations at 45 degrees to the south-north flow (due to shear stress mechanisms). The dynamics that produced this chaotic structure are poorly understood. Our purpose is to present our field methodology and provide field data that will enable validation of models of the MSZ evolution, and here, we present a method for deriving a local velocity field from ground pen
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