NDLI: Analysis of band-passed directional wave data

Content Provider	IEEE Xplore Digital Library
Author	Pedersen, T. Malzone, C. Siegel, E.
Copyright Year	2005
Description	Author affiliation: Nortek AS, Germany (Pedersen, T.)
Abstract	The last 10 years have seen the development of a new class of acoustic Doppler systems that can measure the wave directional spectrum in addition to their classical current profiler capability. Among these systems is the Nortek AWAC (Acoustic Waves and Current), which uses three acoustic beams angled at 25 degrees from vertical for wave direction estimation and profiling current velocities. A fourth beam pointed towards the sea surface is dedicated to measuring surface displacement. This particular system has been the subject of extensive studies worldwide. As a result, we have been able to quantify the AWAC's performance characteristics compared to conventional wave buoys and other forms of wave measurements. Historically, wave data have typically been represented in the form of a series of parameters that characterize the spectral and directional nature of the sea state (e.g. significant wave height, peak period, mean period, peak direction and mean direction). In many applications, such as structural response models or in studies of coastal sediment or pollutant transport in areas with variable bottom topography, this single-parameter representation is not sufficient. Instead, a more comprehensive parameterization is required where the wave data are separated into frequency bands and the wave energy and direction is provided as a function of each band. In turn, this puts more stringent requirements on the accuracy of the wave sensing system itself, which not only has to work in a bulk sense, but also has to be able to provide a true description of the sea state even if the energy content in a given frequency band is quite low. During a recent study near the Diablo Canyon, California, a Datawell Waverider buoy was located only 20 m away from an AWAC deployed in 25 m of water. In this paper, we will describe the results of the comparison between the two instruments and discuss the implications for the possibility of using the AWAC small scale wave array to characterize long waves.
Starting Page	293
Ending Page	300
File Size	800111
Page Count	8
File Format	PDF
ISBN	0933957343
DOI	10.1109/OCEANS.2005.1639778
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Sea measurements Pollution measurement Acoustic waves Acoustic measurements Acoustic beams Surface acoustic waves Sea surface Surface topography Frequency Current measurement
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in