Measuring Shallow Water Waves With Pressure Sensors
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Measuring Shallow Water Waves With Pressure Sensors
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Author : Vitor Manuel Henriques Goncalo
language : en
Publisher:
Release Date : 1978
Measuring Shallow Water Waves With Pressure Sensors written by Vitor Manuel Henriques Goncalo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Ocean waves categories.
For two locations within the surf zone sea surface elevations were observed using a wave staff and a pressure sensor while simultaneously the two horizontal orthogonal components, u and v, of water particle velocity were measured. Surface elevations derived from pressure sensors are lower, mainly in the region of the crest, compared with the same surface elevations measured with wave gages. Pressure records are more smoothed than wave gage records, and the energy computed for waves measured with a pressure sensor is consistently smaller than for waves measured with a wave gage. Methods for converting pressure to surface elevation are given which include the non-linear velocity term (u sq + v sq) which is usually neglected in the Bernoulli equation. Two techniques are proposed to include this term: (1) flowmeters are used to measure u and v, and (2) the Bernoulli term is derived by determining the velocities by convolving the pressure records using a weighting function determined from shallow water theory.
Measuring Shallow Water Waves With Pressure Sensors
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Author :
language : en
Publisher:
Release Date : 1978
Measuring Shallow Water Waves With Pressure Sensors written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
Topographical Measurements Of Water Waves At A Matrix Of Measuring Points
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Author : Peter Vennemann
language : en
Publisher: diplom.de
Release Date : 2002-02-15
Topographical Measurements Of Water Waves At A Matrix Of Measuring Points written by Peter Vennemann and has been published by diplom.de this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-02-15 with Science categories.
Inhaltsangabe:Abstract: The measurement of the shape of a water wave is important for the study of a wide range of questions like the understanding of wave motions, the wave shapes dependence an the quality of the ground, the water depth or the surface tension which might be altered by pollution. The mixing of substances or gases at the surface of the sea is dependent an the waves shapes. The shape of a water wave is also interesting for understanding the transport mechanisms and the energy of waves. Knowledge about water wave shapes is essential for the design of an effective shore protection which is going to be more and more important when the sea level is rising. Furthermore offshore designers require knowledge about the shape of a wave during its interaction with installations for optimising the shape of offshore structures and for calculating the loading. This is a key requisite for the design and the construction of cost effective and save structures of any kind like buoys, lifeboats, ships, oil rigs or other offshore platforms. Measurements of wave shapes for example can help to understand the interference or upwelling caused by the legs of typical offffshore platform geometries which can enhance the wave amplitude and possible wave impact with the underside of the platform. The probably simplest way of measuring the surface of a wave is to put a certain number of water depth gauges into the water, taking a photo of the wave when it is passing the gauges and then reading every single measure from the photograph. The wave shape can be reconstructed by interpolating the waves surface between the measuring points. The considerable distortion of the measuring object by the measuring instruments is disadvantageous. An array of pressure sensors in a plain below the water surface can be used instead of the gauges to avoid the distortions. The pressure at every single sensor is a measure for the water height above the sensor. The disadvantage of this method is the sensitivity of the pressure sensors for the dynamic pressure of water flows caused by turbulences, in particular in shallow water, underneath breaking waves or close to constructions. Also disadvantageous is the necessity of mounting a part of the measuring system under the water. To avoid this problems, photographic methods for the recording of surface waves have been developed: At the beginning of the 20th century the first attempts have been made to collect elevation data of ocean [...]
Measuring And Understanding Coastal Processes
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 1989-02-01
Measuring And Understanding Coastal Processes written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989-02-01 with Science categories.
Much of the U.S. coastline is rapidly changingâ€"mostly eroding. That fact places increasing pressure on the planners and managers responsible for coastal development and protection, and could have a direct effect on many of the 125 million Americans living within 50 miles of the coast who rely on its resources and beaches for their livelihood or recreation. Although rapid advances have been made in the measurement systems needed to understand and describe the forces and changes at work in the surf-zone environment, their potential for allowing more accurate and reliable planning and engineering responses has not been fully realized. This book assesses coastal data needs, instrumentation, and analyses, and recommends areas in which more information or better instrumentation is needed.
Handbook Of Ocean Wave Energy
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Author : Arthur Pecher
language : en
Publisher: Springer
Release Date : 2016-12-07
Handbook Of Ocean Wave Energy written by Arthur Pecher and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-12-07 with Technology & Engineering categories.
This book is open access under a CC BY-NC 2.5 license. This book offers a concise, practice-oriented reference-guide to the field of ocean wave energy. The ten chapters highlight the key rules of thumb, address all the main technical engineering aspects and describe in detail all the key aspects to be considered in the techno-economic assessment of wave energy converters. Written in an easy-to-understand style, the book answers questions relevant to readers of different backgrounds, from developers, private and public investors, to students and researchers. It is thereby a valuable resource for both newcomers and experienced practitioners in the wave energy sector.
Comparison Of Measured And Transformed Directional Wave Spectra Using A Linear Refraction Model
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Author : James Cheng Liu
language : en
Publisher:
Release Date : 1990
Comparison Of Measured And Transformed Directional Wave Spectra Using A Linear Refraction Model written by James Cheng Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Waves categories.
The Direction Of Coastal Engineering In The Corps And The Resulting Impact On R D
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Author : Coastal Engineering Research Board. Meeting
language : en
Publisher:
Release Date : 1996
The Direction Of Coastal Engineering In The Corps And The Resulting Impact On R D written by Coastal Engineering Research Board. Meeting and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Coastal engineering categories.
Introductory Dynamical Oceanography
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Author : Stephen Pond
language : en
Publisher: Elsevier
Release Date : 2013-10-22
Introductory Dynamical Oceanography written by Stephen Pond and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Science categories.
'Introductory Dynamical Oceanography' 2nd ed provides an introduction to Dynamical Physical Oceanography at a level suitable for senior year undergraduate students in the sciences and for graduate students entering oceanography. It aims to present the basic objectives, procedures and successes and to state some of the present limitations of dynamical oceanography and its relations to descriptive physical oceanography. The first edition has been thoroughly revised and updated and the new work includes reference to the Practical Salinity Scale 1978, the International Equation of State 1980 and the beta-spiral technique for calculating absolute currents from the density distribution. In addition the description of mixed-layer models has been updated and the chapters on Waves and on Tides have been substantially revised and enlarged, with emphasis on internal waves in the Waves chapter. While the text is self-contained readers are recommended to acquaint themselves with the general aspects of descriptive (synoptic) oceanography in order to be aware of the character of the ocean which the dynamical oceanographer is attempting to explain by referring to Pickard and Emery's 'Descriptive Physical Oceanography' 4th edition.
Ocean Wave Mechanics
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Author : V. Sundar
language : en
Publisher: John Wiley & Sons
Release Date : 2017-02-13
Ocean Wave Mechanics written by V. Sundar and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-02-13 with Science categories.
This is a textbook aimed at graduate students and offshore engineering practitioners that covers basic fluid mechanics and the deterministic and statistical descriptions of infinitesimal and finite amplitude water waves. It reviews the theory of wave loading on structures and closes with a chapter on the potential of ocean wave energy and devices for extracting it. Since the 1980s there has been tremendous progress in numerical and physical modelling of coastal and offshore structures in waves. This calls for a clear understanding of the phenomena of wave generation, propagation, deformation and its effects on marine structures. This book will help the reader to understand the many results and descriptions found in journals, reports and research papers. It is self-contained, and encompasses the fundamentals of the subject with sufficient description and illustrations.
Directional Irregular Wave Kinematics
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Author : Christopher H. Barker
language : en
Publisher:
Release Date : 1998
Directional Irregular Wave Kinematics written by Christopher H. Barker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Kinematics categories.