A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Nearshore Wave Direction Gage
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 in steepness such that 0.007< or = H/1< or = 0.05, were analyzed by three different estimation methods. For example, with 10 peak water level measurements (36 deg spacing around the pile), one estimation method gave directions within a range of 2.8 deg, on the average, for all test crests. The results indicate that four water-level sensors embedded in a vertical pile at 60 deg spacing might be used to measure the direction of single nearshore wave trains to a point within + or - 3 deg over a 120 deg range, in an instrument that can be made fully automatic. (Author)
Nearshore Wave Direction Gage
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 in steepness such that 0.007< or = H/1< or = 0.05, were analyzed by three different estimation methods. For example, with 10 peak water level measurements (36 deg spacing around the pile), one estimation method gave directions within a range of 2.8 deg, on the average, for all test crests. The results indicate that four water-level sensors embedded in a vertical pile at 60 deg spacing might be used to measure the direction of single nearshore wave trains to a point within + or - 3 deg over a 120 deg range, in an instrument that can be made fully automatic. (Author)
Nearshore Wave Direction Gage
W. R. James (author) / R. J. Hallermeier (author)
1975
18 pages
Report
No indication
English
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