APPLICATION OF TIDAL ASYMMETRY QUANTIFICATION METHOD IN BULI BAY AND THE CORRELATION WITH ITS FLUSHING TIME

• Main Author: Arkhan Anan, Naufal
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/84580
• Institution: Institut Teknologi Bandung

Morphological changes cause the propagation of tidal waves from deep waters into shallow waters to undergo distortions, resulting in different durations and strengths between high tide and low tide, which is then referred to tidal asymmetry. Meanwhile, in semi-enclosed waters (bays), there is an exchange process between offshore waters and waters within the bay that can be quantified as flushing time. This study aims to quantify tidal asymmetry and flushing time in Buli Bay and examine the correlation between them. Tidal asymmetry was calculated using statistical methods, and flushing time was determined based on the volume of water leaving the bay during low tide. The study yielded an asymmetry score in Buli Bay of -0.0612, indicating that Buli Bay exhibits an ebb-dominance asymmetry type. Additionally, the type of asymmetry in Buli Bay is homogeneous or does not vary spatially. Buli Bay has a flushing time of 6.2 days during spring tides and 28.5 days during neap tides, meaning perfect flushing occurs during spring tides, while flushing during neap tides is incomplete. Although the correlation direction between the asymmetry score does not align with the initial hypothesis, the correlation strength (|r|) for spring + neap conditions yields a value of |r|=0.62, indicating a moderate correlation or a substantial relationship between the asymmetry score and flushing time. In contrast, the correlation value decreases to |r|=0.59 for spring tide conditions, still indicating a moderate correlation. For neap tide conditions, the correlation value increases to |r|=0.704, indicating a strong correlation, demonstrating a significant relationship between the asymmetry score and flushing time during neap tides. Further analysis shows that tidal asymmetry plays a role in the flushing process in Buli Bay.