Automated Detection of Breaking Wave Height Using an Optical Technique.
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| Title: | Automated Detection of Breaking Wave Height Using an Optical Technique. |
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| Authors: | Shand, Thomas D.1 (AUTHOR) t.shand@wrl.unsw.edu.au, Bailey, Donald G.2 (AUTHOR) d.g.bailey@massey.ac.nz, Shand, Roger D.3 (AUTHOR) rshand@coastalsystems.co.nz |
| Source: | Journal of Coastal Research. May2012, Vol. 28 Issue 3, p671-682. 12p. 7 Diagrams, 4 Charts, 5 Graphs. |
| Subjects: | Optical oceanography, Measurement of ocean waves, Digital photogrammetry, Coastal zone management, Hydrodynamics |
| Abstract: | Obtaining accurate information of nearshore wave characteristics including the position and height of individual breaking waves is essential to understanding the drivers of coastal processes, for engineering design and hazard prediction. Demand for such information in real time for recreational planning and hazard assessment is also high. Remote optical techniques would offer considerable economic and spatial coverage advantages over conventional in situ instrumentation. However, optical methods for obtaining wave height information have been slow to develop and those available remain computationally expensive and require "favourable" environmental conditions. This paper presents a relatively simple yet robust approach to detecting and quantifying breaking wave position and height across a wide surf zone using a twin video camera configuration coupled with an image time-stack analysis approach. A numerical algorithm, HbSTACK, is developed and successfully tested under the environmental conditions experienced during field trials. Errors and uncertainties may arise in both the photogrammetric transformation from pixels to real-world coordinates and in the detection of wave crest and trough positions. These errors have been assessed using both field verification of the transformation model and manually detected crest and trough locations by experienced practitioners. Errors in output wave heights were thus estimated to be less than 7%. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Coastal Research is the property of KnowledgeWorks Global, Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 80007878 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Automated Detection of Breaking Wave Height Using an Optical Technique. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Shand%2C+Thomas+D%2E%22">Shand, Thomas D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> t.shand@wrl.unsw.edu.au</i><br /><searchLink fieldCode="AR" term="%22Bailey%2C+Donald+G%2E%22">Bailey, Donald G.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> d.g.bailey@massey.ac.nz</i><br /><searchLink fieldCode="AR" term="%22Shand%2C+Roger+D%2E%22">Shand, Roger D.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> rshand@coastalsystems.co.nz</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Coastal+Research%22">Journal of Coastal Research</searchLink>. May2012, Vol. 28 Issue 3, p671-682. 12p. 7 Diagrams, 4 Charts, 5 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Optical+oceanography%22">Optical oceanography</searchLink><br /><searchLink fieldCode="DE" term="%22Measurement+of+ocean+waves%22">Measurement of ocean waves</searchLink><br /><searchLink fieldCode="DE" term="%22Digital+photogrammetry%22">Digital photogrammetry</searchLink><br /><searchLink fieldCode="DE" term="%22Coastal+zone+management%22">Coastal zone management</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrodynamics%22">Hydrodynamics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Obtaining accurate information of nearshore wave characteristics including the position and height of individual breaking waves is essential to understanding the drivers of coastal processes, for engineering design and hazard prediction. Demand for such information in real time for recreational planning and hazard assessment is also high. Remote optical techniques would offer considerable economic and spatial coverage advantages over conventional in situ instrumentation. However, optical methods for obtaining wave height information have been slow to develop and those available remain computationally expensive and require "favourable" environmental conditions. This paper presents a relatively simple yet robust approach to detecting and quantifying breaking wave position and height across a wide surf zone using a twin video camera configuration coupled with an image time-stack analysis approach. A numerical algorithm, HbSTACK, is developed and successfully tested under the environmental conditions experienced during field trials. Errors and uncertainties may arise in both the photogrammetric transformation from pixels to real-world coordinates and in the detection of wave crest and trough positions. These errors have been assessed using both field verification of the transformation model and manually detected crest and trough locations by experienced practitioners. Errors in output wave heights were thus estimated to be less than 7%. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Coastal Research is the property of KnowledgeWorks Global, Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.2112/JCOASTRES-D-11-00105.1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 671 Subjects: – SubjectFull: Optical oceanography Type: general – SubjectFull: Measurement of ocean waves Type: general – SubjectFull: Digital photogrammetry Type: general – SubjectFull: Coastal zone management Type: general – SubjectFull: Hydrodynamics Type: general Titles: – TitleFull: Automated Detection of Breaking Wave Height Using an Optical Technique. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Shand, Thomas D. – PersonEntity: Name: NameFull: Bailey, Donald G. – PersonEntity: Name: NameFull: Shand, Roger D. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2012 Type: published Y: 2012 Identifiers: – Type: issn-print Value: 07490208 Numbering: – Type: volume Value: 28 – Type: issue Value: 3 Titles: – TitleFull: Journal of Coastal Research Type: main |
| ResultId | 1 |
