Frequency dependence of high-frequency bottom reflection loss
- Title
- Frequency dependence of high-frequency bottom reflection loss
- Author
- 나정열
- Issue Date
- 2003-08
- Publisher
- 한국소음진동공학회
- Citation
- 한국소음진동공학회 국제학술발표논문집 2003년, no. 1, page. 3743-3748
- Abstract
- High-frequency (40 ~ 120 kHz) reflection loss measurements on the water-sandy sediment
w
Second Author: Soon Shik Park
rth and Marine Sciences, Hanyang Uni
Ansan , Kyunggi-do, Korea 425-791
Third Author: Jungyul Na
and Marine Sciences, Hanyang
Ansan , Kyunggi-do, Korea 425-791
ith a flat interface were conducted in a water tank for various grazing angles. The water tank
(5×5×5 m) was filled with a 0.5 m-thick-flat bottom of 0.5 φ-mean-grain-size sand.
Experimentally obtained reflection losses as a function of grazing angle and frequency were
compared with the APL-UW forward loss model (Mourad & Jackson, 1989). For frequencies
below 60 kHz, the observed losses are well agreed with the reflection loss model, however, in
cases for frequencies above 70 kHz, the observed losses are greater by 2 ~ 3 dB than the
model. The model calculation, which does not fully account for the vertical scale of roughness
due to grain size produce less bottom losses compared to the observations that correspond to
large roughness based on the Rayleigh parameter in the wave scattering theory. In conclusion,
for the same grain-size-sediment, as frequencies increase, the grain-size becomes the scale of
roughness that could be very large for the frequencies above 70 kHz.
- URI
- http://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE02456175?https://repository.hanyang.ac.kr/handle/20.500.11754/156698
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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