시추선의 작업환경이 어류의 분포에 미치는 영향

Abstract

Human beings need much more oil in accordance with the growth of industry. But oil production in land was lack in the middle of twentieth century. Therefore ocean drilling was developed until now. A point of fishery, drilling rigs or ocean plants, operation at one place during long period, are one of the huge artificial reef. In this paper conducted to prove, semi-submersible drilling rig is habitable place for fish and marine mammal or not. on this study used second generation semi-submersible drilling rig and she is 10,054 G/T. It measured under water radiation noise and irradiance distribution of light around rig. As a result underwater radiation noise was 125dB/µPa∼158dB/µPa at low frequency and irradiance distribution was 21.5lx∼43.1lx. and at same time inspected for identify actual distribution of fish shoals around rig by ROV at drilling operation time in East Sea and experimental fishing in Malaysia territory. Fish shoals showed up in begin of drilling operation and end of drilling operation. But there are few fish shoals in the midst of drilling operation. there are many reason of this result. but main is destroyed habitable place due to blow out mud and broken pieces of ground formation in drilling hole. drilling rig for a temporary time. In conclusion, Drilling rig was proved habitable place for fish and marine mammal by the analysis of under water radiation noise and irradiate distribution. but this is depend on each character and condition of rigs and ocean plant. For instance Semi-submersible rigs and drill ships made in recently, that were out of luring effect range because occurred over underwater radiation noise levels compared with past generation drilling rigs.