| Summary: | 碩士 === 國立中山大學 === 海下科技研究所 === 104 === nderwater acoustic technology is widely used in marine resources exploration, air crash survey and shipwreck, even underwater archaeology is included. Sub-bottom profiler is one of the system to measure marine geology. To find the uncertainty of reflection coefficient by useing this set of system. We use the acoustical sub-bottom profiler made by our lab and focus on verifying two assumptions from reflection of the coefficient formula. First of all, analysis of the sound pressure transmission loss in the water layer which affected by the change of hydrology environmental. Then, verifying the sound pressure reflection at the sea surface is the total reflection. The experiments carried out in the waters southwest of Taiwan and the South China Sea. According to the experimental results, identifying the uncertainty of sound pressure loss over distance, and quantify this uncertainty results to apply in the calculation of the reflection coefficients. And provide reflection coefficient correction value from water reflection. Enhance calculations accuracy with two echo to calculate the reflection coefficient. The two correction will be verify by seabed sampling and videos and provide a reference to scholars who study marine sediments.
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