Temporary Shadow Zone Analysis Using Parabolic Equation Method In The Lifamatola Strait, North Maluku

Abstract

Abstract

 Indonesia has wide waters two thirds from mainland Thing this Becomes base for Indonesia to could utilise profusely potency existing sea _ good from riches bioavailability and mineral content _ in it , besides have riches Indonesia also has nature potency which need supervision specifically room still underwater _ not yet capable We master and control , p this raises vulnerability for Indonesian territorial security . Enhancement ability in utilise technology is something inevitability in maintain very area _ broad , broad determination of the Shadow zone in an area that is temporary will Becomes addition in do area security . Shadow Zone temporary analysis with method Parabolic Equation in the North Maluku Lifamatola Slat concluded that Profile the speed of sound in the waters of Lifamatola, North Maluku at high tide and low tide , indicates The attenuation coefficient will affect the TL value which is based on the simulation results of the TL value if the distance is farther (deep water), then the TL value will be even greater. The Shadow Zone area at a depth of 985 meters is wider than at a depth of 775.6 due to the longer sound wave distance , the distribution pattern of soundproof columns ( Shadow Zone ) during high tide and low tide conditions . There are many shadow zone patterns at Station 2 found compared at Station 1 . on location transducer 25 meters, visible medium that is not caught radiance more narrow compared with location transducer 110 meters so the Shadow Zone area with position transducer 110 meters more broad .

Keywords : _ Speed sound , Transducer , Shadow Zone, Parabolic Equation.