| Author | Wu, Shih-hsiung |
| Call Number | AIT Thesis no. WA-79-23 |
| Subject(s) | Breakwaters--Mathematical models
|
| Note | A thesis submitted in partial fulfillment of t he requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | In recent years, the need for a method to analyze the mechanism of wave-object interaction is clearly demonstrated by the numerous offshore construction activities. An understanding of the interaction of waves and submerged objects on horizontal bed, including the theoretical and experimental analysis, has developed rapidly during the last decade. However, research on the condition in which the submerged objects are located
on a sloping bed still need to be carried out. This study combines the diffraction theory, a basic theory for analyzing the interaction of waves and large objects, and the finite element
method, an accurate and powerful numerical method, to compute the reflection
coefficient, transmission coefficient as well as the wave induced forces for different objects submerged on the sloping bed. The governing equations, boundary conditions and the variational principle corresponding to them are
introduced in the analysis. Since this boundary valued problem contains an infinite boundary, the eighfunction expansion is employed to truncate this infinite boundary which is replaced by a radiation condition after the
behaviour of the local disturbance has been examined. Further, a computer program, based on diffraction theory and finite element method, is used to
directly compute the reflection coefficient, transmission coefficient and wave forces.
The numerical results for each kind of object indicate that (1) in
creasing the crest width, increases the reflection coefficient, vertical force coefficient and horizontal force coefficient but decreases the
transmission coefficient; (2) increasing the object height increases the reflection coefficient and wave force coefficient; (3) the shape of the
object does not effect the reflection coefficient but the values of vertical and horizontal force coefficient for trapezoidal shapes are always greater than that of rectangular shapes; (4) increasing the slope of the
bed increases the reflection coefficient but decreases the horizontal wave force coefficient.
Finally, the finite element solution are also compared with some of the experimental results. |
| Year | 1980 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Overbeek, Henk Jen |
| Examination Committee(s) | Tawatchai Tingsanchali ;Gupta, Ashim Das ;Huynh, Ngoc Phien
|
| Scholarship Donor(s) | Republic of China |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1980 |