This report briefly describes a hybrid element model for calculating linear wave oscillation in and near coastal harbors. The model includes bottom friction and boundary absorption. The bottom friction is assumed to be proportional to flow velocity with a phase difference. The boundary absorption adopts a formulation similar to the impedance condition in acoustics, and it is expressed in terms of wave number and reflection coefficient of the boundary. En the model the entire domain is divided into the near and far regions by an artificially semicircular boundary. The near region should encompass the harbor and the concerned marine structure and bathymetry. The far region is assumed to have a straight coastal line and a constant water depth. A conventional finite element approximation is used for the near region, while an analytical solution is used for the far region. A variational principle with a proper functional is established to ensure these matching conditions are satisfied along the artificial semicircular boundary. HARBS and HARBD computer programs are based on the hybrid element model. The HARBS program is applicable to shallow-water waves. It allows fixed platforms, either floating or bottom-mounted, in the water domain. Typical platforms are breakwaters, moored ships, pontoons, storage tanks, and moored barges. The HARBD program is applicable to arbitrary depth water waves such as shallow, intermediate, and deepwater waves. It cannot allow floating platforms in the water domain. Both the HARBS and HARBD programs are very efficient; however, the former is less costly to execute than the latter. General features of HARBS and HARBD are described in this report, and data input requirements are presented in detail. Guidelines for use of the programs to specific field problems are given and illustrated with a rectangular harbor. The programs are written in FORTRAN V, and a complete listing of the programs is included. The formatted input data and a sample of the program output for the rectangular harbor are also included.
Calculation of Water Oscillation in Coastal Harbors; HARBS and HARBD User's Manual
Instruction Report ; CERC-87-2
1987
2559760
Report
Electronic Resource
English
SLUB | 1980
|NTIS | 1997
|NTIS | 1980
NTRS | 1980
NTIS | 1976
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