#TITLE_ALTERNATIVE#

• Main Author: MIKHA PRASETIYO (NIM : 12909039), JUAN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28341
• Institution: Institut Teknologi Bandung

The current system in Gaspar Strait and the Karimata Strait are influenced dominantly by monsoon. During east monsoon, the direction of non-tidal current dominantly go to northwest consistent with the wind direction. This final project is aimed to determine wind’s influence toward current in Gaspar and Karimata Strait as well as profile analysis of non-tidal non-winddriven current velocity. <br /> <br /> The observed data are total current in measurement station B1 (Gaspar Strait) and measurement station B2 (Karimata Strait) that are obtained from research program SITE (South China Sea-Indonesia Seas Transport/Exchange) on 2011-2012. These data then processed with harmonic analysis that yields non-tidal current. The non-tidal current then filtered using FFT with the same period of dominant wind of 3 years (2011-2013), thus resulting the wind-driven current. The margins between non-tidal current and wind current is the non-tidal non-winddriven current data. <br /> <br /> Data processing results show the influence of winds are strong enough in the Gaspar Strait and Karimata Strait up to 5 meters depth from surface. The average velocity of wind-driven current (wind dominant periodic is 109.6 days) in the Gaspar Strait 9.05 x 10-2 m/s to northwest on the surface layer and 0.61 x 10-2 m/s to north near bottom layer. Wind-driven currents in the Strait Karimata moving to northwest at the surface layer with an average velocity of 2.69 x 10-2 m/s and 0.31 x 10-2 m/s near the bottom layer. Although the current system in the Gaspar Strait and Karimata Strait are dominantly influenced by the wind, it turns out the non-tidal non-winddriven current flows to south. The average velocity of non-tidal non-winddriven current in Gaspar Strait are 0,83 x 10-2 m/s (to south) on the surface layer and 0,01 x 10-2 m/s (to south) near the bottom, in Karimata Strait are 0,24 x 10-2 m/s (to south) on the surface layer and 0,02 x 10-2 m/s (to south) near bottom layer which make up ±10% contribution to non-tidal current. Further research is still required to declare that Karimata Strait is one of the pathway of the Arlindo.