| Author | Lim, Teck-kong |
| Call Number | AIT Thesis no. 204 |
| Subject(s) | Waves
|
| Note | A thesis submitted for the partial fulfillment of the requirements for the degree of Master of Engineering in the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The Sommerfeld solution of water wave diffraction is composed of two parts, namely, the incident wave term and the reflected wave term. An attempt has been made to treat the two terms separately. Experiments on a semi-infinite breakwater with no reflection from it have
been carried out to check the solution containing only the incident term. It was found that the experiments agreed reasonably well with the modified solution when the angles of incidence were greater than 60°, in the shadow region at distances between 1 to 3 wavelengths from the breakwater tip. Data from similar experiments of other workers,
for distances greater than 3 wavelengths, also indicated a close agreement with the non-reflection solution. Simplified charts have been devised for presenting the diffraction
coefficient at any point within the shadow zone of a semi-infinite breakwater. These employ measurements along the circular wave crests or a polar coordinate system. These graphs can differentiate between the conditions of full, partial, or zero reflection from the breakwater.
Simplifications were also applied to the case of the breakwater gap, in which the wave height behind a gap is expressed in the form of the product of the diffraction coefficient and the square root of the radial distance from the gap. By dividing the graphed value by the square root of the distance from the gap centre to the point in question,
the wave height can be readily predicted. The charts are based on two available theoretical solutions, covering gap widths from 0.5 to 5 wavelengths, and various incident wave angles. Another simplied solution, as well as experimental data from other workers, are also
included for comparis. |
| Year | 1968 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Silvester, Richard |
| Scholarship Donor(s) | Asian Institute of Technology |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1968 |
