Research Article
Nov 1976
Nearshore Wave Direction Gage
Authors: William R. James and Robert J. HallermeierAuthor Affiliations
Publication: Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 102, Issue 4
Abstract
Bow wave formation can cause large variation in peak water level around a thin circular pile in shallow-water waves. The symmetry of this variation might be used to measure wave direction on a crest-by-crest basis. This paper empirically examines the resolution possible in objectively estimating the symmetry point of data sets consisting of small numbers of peak-water-level measurements made around a pile in laboratory wave action. Data sets for several types of single incident crests, in wave action of steepness such that 0.007≤H/≤0.05, were analyzed by three different estimation methods. For example, with 10 peak water level measurements (36° spacing around the pile), one estimation method gave directions within a range of 2.8°, on the average, for all test crests. The results indicate that four water-level sensors embedded in a vertical pile at 60° spacing might be used to measure the direction of single nearshore wave trains to a point within ±3° over a 120° range, in an instrument that can be made fully automatic.
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Published In
Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 102 • Issue 4 • November 1976
Pages: 379 - 393
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: Nov 1976
Published online: Feb 12, 2021
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Authors
Affiliations
William R. James
Mathematical Statistician, Conservation Div., U.S. Geological Survey, Reston, Va.; formerly Chf., Geological Engrg. Branch, Engrg. Development Div., U.S. Army Coastal Engrg. Research Center. Fort Belvoir, Va.
Robert J. Hallermeier
Oceanographer, Coastal Processes Branch, Research Div., U.S. Army Coastal Engrg. Research Center. Fort Belvoir, Va.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.