| Author: | Huang, Dingyuan |
| Title: | Finite difference modelling of coastal hydrodynamics |
| Degree: | M.Sc. |
| Year: | 1994 |
| Subject: | Coast changes Hydrodynamics Water waves Finite differences Hong Kong Polytechnic -- Dissertations |
| Department: | Department of Civil and Structural Engineering |
| Pages: | 1 v. (various pagings) : ill. ; 30 cm |
| Language: | English |
| Abstract: | To handle the environmental and engineering problems associated with coastal regions, numerical modelling is a very useful tool. In the present study, a two-dimensional Alternating-direction Implicit (ADI) hydrodynamic model, which includes the advection terms, bottom friction terms, and eddy viscosity terms, is first examined to demonstrate its good stability and accuracy. The ADI model is then applied to a real problem for verification by comparing the numerical results with field observations, the effects of different values of eddy viscosity on the simulated results are also examined. It can be concluded from the good agreement between computed and field data that the model under consideration can give reliable results under different conditions. The model is finally employed to simulate the tidal circulation in the western harbour of Hong Kong. Simulations are performed with the dry and wet season tides. The dynamic steady state flow is assumed when the results of the corresponding time steps in two successive tidal cycles are differed by less than 1 x 10-4 in magnitude. In these runs, reasonable values of the Manning's n and eddy visocity E are first determined for subsequent assessment of the predictive ability of the model. The hydrodynamic circulation in the western harbour is also studied in details. The results of the simulations indicate that the currents close to the coast of southern New Territories are very definite in direction, and there is an eddy around the island of Chek Lop Kok during the tidal variations. In addition, it is demonstrated that the vertically averaged assumption used in the study is reasonable and acceptable by comparing the results obtainnd with the ADI and 2-layer model respectivly. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b11474075.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.38 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/4174