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1
題名:A Study of the Characteristics of Scattering Attenuation by Physical Modelling    
著者:Chao-Hui HsiehYoung-Fo Chang
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:Scattering attenuation ; Intrinsic attenuation ; Physical model
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:7卷1期(1996.3)
頁碼:31-42
語言:英語
摘要: 英文摘要PDF

Scattering attenuation (1/Qs) depends not only on wave frequency but also on scatterer size. Using void holes as scatterers in a thin duralumin plate, and with the kα value (k is the wave number, α the scatterer radius) being changed systematically from 0.05 to 5, the fluctuation of direct waves between a homogeneous and a scattering medium are observed in order to calculate the scattering attenuation by 2-D physical model experiments. The experimental results show that 1/Qss-1, whereas at low frequency the decay of 1./Qs4 is steeper than predicted by Rayleigh scattering. The medium can be considered to be a quasi-homogeneous one, and the scattering effect can be neglected when kα<0.05. The velocity fluctuation has a sharp change at kα=0.5. The velocity of the scattering medium doesn't change when 0.5. Whether the wave length is smaller or greater than the scatterer size, the P-and S-waves have the same scattering attenuation coefficients if they have the same ka value.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 7卷1期 (1996.3)
Locating Groundwater at Ta-Kang-Shan and Ping-Ting Sites by Geoelectric Methods/ Chieh-Hou YangLun-Tao Tong
Total Electron Content Obtained by Using the Global Positioning System/ Jann-Yenq LiuHo-Fang TsaiTing-Kuo Jung
End Members of Water-Masses in the Western Japan Sea/ Yuan-Hui LiGwo-Ching Gong
The 16 September 1994 Earthquake (mb=6.5)in the Taiwan Strait and Its Tectonic Implications/ Honn KaoFrancis T. Wu
Semi-Diurnal Tide on the Shelf Break in Northeast of Taiwan/ Tswen-Yung TangDa-Wei Lee
A Study of the Characteristics of Scattering Attenuation by Physical Modelling/ Chao-Hui HsiehYoung-Fo Chang
Size Distributions of Aerosol Particles in the Free Troposphere: Aircraft Measurements in the Spring of 1991-1994 Over Japan/ Yasunobu IwasakaIkuko MoriMasahiro NagataniHiroshi NakadaKatsuji MatsunagaHideaki Nakane
Further Studies of a Prefrontal Convective Rainband During TAMEX IOP 13: Part Ⅰ: Reflectivity History and Cell Evolution/ Yeong-Jer LinRobert W. PaskenJoe G. ZilkaMartin R. Martino
An Exploratory Study of the Relationship between Annual Frequency of Invaded Typhoons in Taiwan and El Nino/Southern Oscillation/ Jen-Cheng Joseph Chang
 
   
 
   

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