An examination of the wind-driven effect on the drift of precipitation particles using the Chung-Li VHF radar

NCUIR > College of Earth Sciences > Graduate Institute of Space Science > journal & Dissertation > Item 987654321/27466

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27466

Title:	An examination of the wind-driven effect on the drift of precipitation particles using the Chung-Li VHF radar
Authors:	Chu,YH;Chen,TY;Lin,TH
Contributors:	太空科學研究所
Keywords:	RAINDROP SIZE DISTRIBUTIONS
Date:	1997
Issue Date:	2010-06-29 18:39:14 (UTC+8)
Publisher:	中央大學
Abstract:	One of the essential assumptions made in estimating the terminal velocity and the drop-size distribution of hydrometeor from the precipitation Doppler spectrum observed by VHF/UHF radar (or wind profiler) is that all of the precipitation particles are moving together at the same velocity as the ambient wind. However, this may not be the case. In this paper, taking advantage of the capability of simultaneously measuring the motions of precipitation particles and the clear-air turbulence with a VHF radar, we develop a method to examine the wind-driven effect on the drift of precipitation particles using the Chung-Li VHF radar. By appropriately setting the radar parameters and steering the radar beams, experimental results show that the drift velocity of the precipitation particles in response to the drag force exerted by the background atmosphere is not the same as the ambient wind velocity, approximately 83% of the latter in this case. This feature indicates that the precipitation particles are not moving with the background wind, causing inaccurate estimations of the terminal velocity and the drop-size distribution of hydrometeor if this effect is not taken into account.
Relation:	RADIO SCIENCE
Appears in Collections:	[Graduate Institute of Space Science] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	435	View/Open

社群 sharing

Loading...