A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development of a Shallow-Water Wave Direction Gage
This paper is a status report on an effort to develop a nearshore wave direction gage with a novel principle of operation. This point direction gage uses a thin pile in fairly shallow water to nonlinearly, but regularly, transform each steep incident crest, momentarily forming a bow wave. A few water level gages deployed around the pile sense the bilaterally symmetric transformation, and then the symmetry direction of a data set from the gages is electronically estimated. Preliminary laboratory tests have indicated direction measurements of high precision may be made from a few data on peak water level at a pile. Details of the envisioned instrument's operation are discussed. There is a variation in peak water level at the pile on the order of the incident crest velocity head, and the accuracy and resolution of the water level gages in sensing this variation seem to place the most important limitations on the instrument's usefulness; the direction of only rather energetic crests can be measured. Some specific design choices are given for a simple instrument that will be useful in typical Great Lakes wave action, according to available data. The remaining development work is clearly indicated; planned efforts will establish the capabilities of this type of instrument. (Author)
Development of a Shallow-Water Wave Direction Gage
This paper is a status report on an effort to develop a nearshore wave direction gage with a novel principle of operation. This point direction gage uses a thin pile in fairly shallow water to nonlinearly, but regularly, transform each steep incident crest, momentarily forming a bow wave. A few water level gages deployed around the pile sense the bilaterally symmetric transformation, and then the symmetry direction of a data set from the gages is electronically estimated. Preliminary laboratory tests have indicated direction measurements of high precision may be made from a few data on peak water level at a pile. Details of the envisioned instrument's operation are discussed. There is a variation in peak water level at the pile on the order of the incident crest velocity head, and the accuracy and resolution of the water level gages in sensing this variation seem to place the most important limitations on the instrument's usefulness; the direction of only rather energetic crests can be measured. Some specific design choices are given for a simple instrument that will be useful in typical Great Lakes wave action, according to available data. The remaining development work is clearly indicated; planned efforts will establish the capabilities of this type of instrument. (Author)
Development of a Shallow-Water Wave Direction Gage
R. J. Hallermeier (author) / W. R. James (author)
1974
18 pages
Report
No indication
English
| NTIS | 1975
Gage and Gage Plumbing & Heating: Water system experts
Online Contents | 1995
Time series surface-wave recovery from pressure gage
| Elsevier | 1986