Next Article in Journal
Analysis of Different Methods for Wave Generation and Absorption in a CFD-Based Numerical Wave Tank
Previous Article in Journal
Numerical Simulation and Uncertainty Analysis of an Axial-Flow Waterjet Pump
Article Menu
Issue 2 (June) cover image

Export Article

Open AccessArticle
J. Mar. Sci. Eng. 2018, 6(2), 72; https://doi.org/10.3390/jmse6020072

Obtaining Reflection Coefficients from a Single Point Velocity Measurement

1
Marine Research Group, Queen’s University Belfast, Belfast BT9 5AG, UK
2
DHIWater & Environment, Agern Allé 5, 2970 Hørsholm, Denmark
*
Author to whom correspondence should be addressed.
Received: 11 May 2018 / Revised: 6 June 2018 / Accepted: 8 June 2018 / Published: 13 June 2018
(This article belongs to the Section Ocean Engineering)
Full-Text   |   PDF [987 KB, uploaded 15 June 2018]   |  

Abstract

The quantification of the reflection of water waves is of paramount importance in coastal and marine engineering. Reflected waves are produced as a result of an incident wave meeting a reflective boundary e.g., in a wave basin. While reflection can be seen as an undesirable disturbance, for example in experimental tests performed in confined tanks, it can also have a useful purpose such as being directed towards wave energy converters (WECs). Whether useful or not, reflection needs to be accurately quantified. For cases effected by directional spreading such as WECs, the wave height of a reflected wave will be spatially variable. The majority of quantification methods are based on frequency domain analysis of surface elevation data at more than one discrete location over approximately one wavelength. Thus, a method which requires a single point measurement is desirable. This paper presents a novel method derived from Linear Wave theory to quantify reflection coefficients using orbital velocity measurements at one discrete location. An additional advantage of this method is it only requires data over a single wave cycle and thus will be particularly suitable for numerical simulations. In the present form the method is only applicable to monochromatic waves. The theoretical background of the method is explained in detail. An application is demonstrated through a comparison to reflections quantified using surface elevation measurements in Computational Fluid Dynamics (CFD) numerical simulations. It is found that the results of the new proposed method compare to surface elevation methods within the levels of experimental accuracy. View Full-Text
Keywords: wave reflection; reflection analysis; water particle velocity measurements; numerical modelling; Computational Fluid Dynamics (CFD); time domain; surface gravity waves wave reflection; reflection analysis; water particle velocity measurements; numerical modelling; Computational Fluid Dynamics (CFD); time domain; surface gravity waves
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

McKee, R.; Elsäßer, B.; Schmitt, P. Obtaining Reflection Coefficients from a Single Point Velocity Measurement. J. Mar. Sci. Eng. 2018, 6, 72.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
J. Mar. Sci. Eng. EISSN 2077-1312 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top