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The Karas coastal area is a productive ecosystem with high vulnerable ecosystem such as mangroves, coral reefs, and seagrasses. The potensial impact of oil and gas activities that existing in this area need to be anticipated and planned comprehensively for sustainable environmental protection. The main problem of this study is existence of vulnerable ecosystem from oil and gas industry even though drilling exploration will be carried out in this area. The aims of the study is to analyze hydrodynamic conditions in its relation to the oil and gas industry in order to anticipate the potential hazard and protect vulnerable ecosystem. The study was carried out by hydrodynamic modelling using MIKE21 HD model software. The field survey was carried out in December 2018. The modeling results showed that the current speed at the highest tide is 0.3 m / s. The pattern of current movements at low tide is dominated by current movements which are relatively stronger and quite dynamic from the northwest to the southeast and partly to the south with an average speed of around 0.53 m / s. The current at low tide is dominated by current from the northeast to the southwest with an average speed of 0.5 m / s. The general modeling results show that current  from the north move away from sensitive area, so this condition have a relatively smaller impact on sensitive areas/ecosytem and can be chosen as a good time for short and brief oil and gas activities.

Modeling, MIKE21, Karas, vulnerable ecosystem, oil and gas