Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Multi-disciplinary Studies | en_US |
| dc.creator | Ma, Chun-sing | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/1002 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | Study of tidal flushing and pollutants transport in two typhoon shelters of Hong Kong using finite element model | en_US |
| dcterms.abstract | The tidal flushing and pollutant transport characteristics of Yau Ma Tei and Sam Ka Tsuen typhoon shelters are determined by a developed finite element model, which is based on the numerical solutions of the two-dimensional mass transport and hydrodynamic equations. It is found that the tidal flushing of pollutants is brought about mainly by the tidal exchanges during flood tide and ebb tide. Moreover, it is determined by the types of open boundary condition. The tidal flushing is found mainly at the entrance of each typhoon shelter, and the effect decreases at points farther away from the entrance. Tidal flushing affects the dispersion rate of pollutants in the typhoon shelters. At ebb tide, the pollutants are transported out from the shelters to the open boundary, and hence the amount of pollutants left inside the shelter is then minimized. On the contrary, during flood tide, certain amount of pollutants will be transported back into the shelter through the entrance. The amount of pollutants in the shelter would reach maximum value during this period. For the use of analytical model, concentration of pollutants for both typhoon shelters are found drop to zero value in 8 days. However, for the use of numerical model, pollutants at different position in the shelter are found to have different dispersion pattern. Therefore, the numerical model can be used to reveal a more realistic situation for the typhoon shelters. A single continuous emission source is also included in the study. A plume is found to be continuously developed in the shelter. In addition, decay of pollutants is also considered to simulate the real situation. From this study, we understand the pollution problems of existing typhoon shelters. However, in order to improve its water quality, we suggest that the government should restrict illegal dumping waste to the sea. As a result, we may have a better environment for better living standard. | en_US |
| dcterms.extent | 1 v. (various paging) : ill. ; 30 cm | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 1995 | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.LCSH | Marine pollution -- China -- Hong Kong | en_US |
| dcterms.LCSH | Tides -- China -- Hong Kong | en_US |
| dcterms.LCSH | Finite element method | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b12050040.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 4.72 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/200/1002