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項次 書目
1
題名:Analyzing the Relationship between Terminal Velocity of Raindrops and VHF Backscatter from Precipitation    
著者:Ching-Lun SuYen-Hsyang ChuChun-Yi Chen
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:VHF radar ; Drop size distribution ; Terminal velocity
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:15卷4期(2004.11)
頁碼:629-645
語言:英語
摘要: 英文摘要PDF

The exponential relationship between α and β in the expression VT=αPβ was first found empirically by Chu et al. (1999), where VT is the mean Doppler velocity of the rain drop with respect to still air, and P is the range-corrected VHF radar backscatter from precipitation. However, they did not provide a theoretical explanation for this relationship. In this article, we will show theoretically that the mathematical relationship between α and β is indeed in an exponential form, namely, α=Aexp(-ξβ), where A is the coefficient in the relation V=ADB, D is the diameter of the rain drop, and ξ is a factor related to radar parameters and precipitation intensity. An examination of this exponential relationship between α and β shows that the radar experimental result was in excellent agreement with the theoretical prediction. From the observational results made with the Chung-Li VHF radar, we find that the value of β varied in the range 0.02-0.14, which is significantly different from the theoretical value of 0.07143. In addition, the β value is found to be positively correlated with the vertical air velocity, which is variable in nature. We, therefore, presume that the vertical air velocity seems to play a crucial factor in governing the change in the β value to explain the large scatter of the observed β values. The application of ξ value to the estimation of the precipitation intensity is also discussed in the text.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 15卷4期 (2004.11)
Morphology and Dynamic Sedimentology in front of the Retreating Tsengwen Delta, Southwestern Taiwan/ Eason HongTien-Chi HuangHo-Shing Yu
Improvement of GPS/MET Ionospheric Profiling and Validation Using the Chung-Li Ionosonde Measurements and the IRI model/ Lung-Chih TsaiWei-Hsiung Tsai
Investigating Subsurface Structures and P- and S-wave Velocities in the Taipei Basin/ Chien-Ying WangYi-Hen LeeMang-Long GerYi-Ling Chen
Analyzing the Relationship between Terminal Velocity of Raindrops and VHF Backscatter from Precipitation/ Ching-Lun SuYen-Hsyang ChuChun-Yi Chen
Relocation of Eastern Taiwan Earthquakes and Tectonic Implications/ Hao KuochenYih-Min WuChien-Hsin ChangJyr-Ching HuWen-Shan Chen
Multi-station Studies on Spread-F and VHF Scintillations in the Indian Sector/ P. V. S. Rama RaoD. S. V. V. D. PrasadK. NiranjanG. UmaS. Gopi KrishnaK. Venkateswarlu
Coseismic Movement and Seismic Ground Motion Associated with the 31 March 2002 off Hualien, Taiwan, Earthquake/ Horng-Yue ChenLong-Chen KuoShui-Beih Yu
Assessment of Traffic Contribution to Hydrocarbons Using 2,2-Dimethylbutane as a Vehicular Indicator/ Chih-Chung ChangTai-Yih ChenClock ChouShaw-Chen Liu
Ethology of the Zoophycos-Producer: Arguments Against the Gardening Model from δ13Corg Evidences of the Spreiten Material/ Ludvig LowemarkIn-Tian LinChung-Ho WangChih-An HuhKuo-Yen WeiChih-Wei Chen
Source Parameters of Regional Earthquakes in Taiwan: January-December, 2002/ Wen-Tzong LiangYu-Hua LiuHonn Kao
An Improved Estimate of Layer Thickness in the Atmosphere Using Dual-Frequency Interferometry Method of MST-VHF Radar/ Jenn-Shyong ChenYen-Hsyang Chu
 
   
 
   

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