Title page for etd-0721114-014019


[Back to Results | New Search]

URN etd-0721114-014019
Author Hai-Fan Wang
Author's Email Address No Public.
Statistics This thesis had been viewed 5537 times. Download 10 times.
Department IAMPUT
Year 2013
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Variation Analysis of Summer Ocean Ambient Noise between Inside and Outside of Northern Mien-Hua Canyon
Date of Defense 2014-07-25
Page Count 74
Keyword
  • QPE
  • SHRU
  • Typhoon Morakot
  • Strumming Noise
  • Northern Mien-Hua Canyon
  • Tidal
  • Ambient Noise
  • Abstract The ambient noise were measured on 3 SHRUs (Several Hydrophone Record Unit) of QPE (Quantifying, Predicting and Exploiting Uncertainty Initiative) Experiment in the North Mien-Hua Canyon in the summer of 2009, and 6 frequencies, which are 50, 100, 500, 1,000, 3,000 and 4,000 Hz, were analyzed in this study. NSYSU-SHRU was deployed on continental shelf at depth of 143 m by National Sun Yat-Sen University (NSYSU), WHOI-SHRU#1 and WHOI-SHRU#2 were deployed inside and outside of Northern Mien-Hua Canyon at depth of 126 m and 337 m by Woods Hole Oceangraphic Institution (WHOI). The fluctuations of NSUSY-SHRU’s ambient noise levels can be analyzed by Fourier analysis. With the similar analysis on temperature variation, the acoustic data has shown obvious K1 and M2 tidal periods. The frequency dependence of ambient noise was also investigated, the low (50, 100 Hz) frequency components were mainly contributed from distant shipping and strumming noise, and the local wind was the dominant factor in higher (500, 1000, 2,000 and 4,000 Hz) frequencies. The result was further verified by the increased levels at higher frequency due to the typhoon Morakot during the experiment. The probability distribution of ambient noise levels was calculated at each frequency, and was found the lower frequency ambient noise levels were significantly affected by the strumming noise of mooring, and the higher frequency ambient noise levels were significantly affected by the typhoon. Finally, we also investigate the difference between inside and outside of Northern Mien-Hua Canyon by WHOI-SHRU#1 and WHOI-SHRU#2, the low (50, 100 Hz) frequency components were mainly contributed from distant shipping and the masking effect by canyon terrain, the water depth was the dominant factor in higher (500, 1000, 2,000 and 4,000 Hz) frequencies, and the noise level inside of the Northern Mien-Hua Canyon is lower than outside for 6~14 dB.
    Advisory Committee
  • Shiuh-Kuang Yang - chair
  • Linus Y.S. Chiu - co-chair
  • Ruey-Chang Wei - advisor
  • Files
  • etd-0721114-014019.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2014-08-21

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys