Finite difference modelling of coastal hydrodynamics

Pao Yue-kong Library Electronic Theses Database

Finite difference modelling of coastal hydrodynamics


Author: Huang, Dingyuan
Title: Finite difference modelling of coastal hydrodynamics
Degree: M.Sc.
Year: 1994
Subject: Coast changes
Water waves
Finite differences
Hong Kong Polytechnic -- Dissertations
Department: Dept. 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.

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