SEICHES AND HARBOR OSCILLATION IN A BASIN OF VARIOUS GEOMETRIC SHAPE

• Main Author: HANY QOSHIROTUR RIF'ATIN (NIM: 10114019)
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27721
• Institution: Institut Teknologi Bandung

Seiches are the long-period standing oscillation in an enclosed basin or in a locally isolated part of a basin. Harbor oscillations are a specific type of seiche motion that occur in partially enclosed basins that are connected through one or more openings to the sea. When the period of these motions coincides with the natural period of sway, further resonance occurs, which can result in possible damage of a moored ship or port facilities. We will solved the governing equation, which is shallow water equation, analytically in order to define the fundamental natural resonant period in a basin of various geometric shape. The analytical solution will be compared to experimental results and confirmed by numerical solution. The numerical solution will be computed using finite volume method on a staggered grid. Further, porous media existent is offered in order to avoid the effect of resonant phenomenon. The advantages of porous media in reducing wave’s amplitude was investigated by some researchers using experimental approach. We propose a modification of shallow water equation involving the existent of porous media to investigate the effect of it for resonance phenomenon, by adding a friction term in momentum equation. Using numerical simulation with the same method we learned that the existent of porous media in a basin can decrease the value of wave’s amplitude even avoid the resonance phenomenon. Contribution of two main factors in porous media, which are friction and porosity in reducing the value of wave’s amplitude are also will be analyzed numerically using the same method.