Topic
Disdrometer
About: Disdrometer is a research topic. Over the lifetime, 930 publications have been published within this topic receiving 23092 citations.
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01 Jan 2002
TL;DR: In this article, the performances of two sensors that measure drop size distributions (DSDs) using different principles and their estimates of rainfall amounts were compared, and it was demonstrated that the number concentration of small diameter drops is underestimated by JW as the rainfall-rate increases and that the long-time-period averaged DSD followed well a gamma distribution.
Abstract: The performances of two sensors that measure drop size distributions (DSDs) using different principles and their estimates of rainfall amounts were compared A classical Joss-Waldvogel disdrometer (JW) and a new instrument named PLUDIX (an X-band raingauge-disdrometer) were used; rainfall rates were also measured by a tipping-bucket raingauge The instruments were operated during the winter of 2001/2002 at the Department of Physics-University of Ferrara (Ferrara, Italy) Four stratiform rainfall events, one snow event and a rain-hail event were analyzed It was demonstrated that the number concentration of small diameter drops is underestimated by JW as the rainfall-rate increases and that the long-time-period averaged DSD followed well a gamma distribution It was also found that the Pludix DSD is better parametrized by an exponential distribution Pludix for the light rain
1 citations
28 Dec 2019
TL;DR: Wang et al. as mentioned in this paper used 2D video disdrometer (2DVD) and 1-D disdrameter (Parsivel2) to study the performance difference of the two instruments at the same location in the campus of CUIT (Chengdu University of Information Technology).
Abstract: Observations in September 2018 from 2-D video disdrometer (2DVD) and 1-D disdrometer (Parsivel2) are used to study the performance difference of the two instruments at the same location in the campus of CUIT (Chengdu University of Information Technology). The characteristics of rainfall intensity, raindrop size distribution (DSD) and particle number density from the two instruments respectively are analyzed and compared according to rainfall intensity classification. The results show that 1) In the process of light rain, moderate rain, heavy rain and rainstorm, the DSD of the two instruments shows a single peak characteristic, and the peak value appears at the raindrop diameter of about 0.6mm. 2) For the number of raindrops with diameter less than 2mm, 2DVD detection value is greater than Parsivel2 detection value, and the D-value increases with the increase of rainfall intensity. 3) With the increase of rainfall intensity, the proportion of raindrops with diameter less than 2mm to the total raindrops decreases. 4) Parsivel2 can hardly detect raindrops with a diameter less than 0.3mm, while 2DVD has a better detection effect on raindrops with a diameter of about 0.19mm, and the detection ability for raindrops with a diameter less than 1mm is far lower than 2DVD. 5) The rainfall in Chengdu is mainly composed of small raindrops with a diameter of about 1mm. 6) The peak value of rainfall intensity of 2DVD is prior to that of Parsivel2, and the two peaks are basically the same in light rain, but with the increase of rainfall, the peak value of 2DVD will be greater than that of Parsivel2.
1 citations
01 Nov 2006
TL;DR: In this paper, drop shapes derived from the 2-dimensional video disdrometer are presented in terms of probability contours and a fitted equation is used for T-matrix calculations to derive specific attenuation for horizontal and vertical polarizations at 20 GHz.
Abstract: Drop shapes derived from the 2-dimensional video disdrometer are presented in terms of probability contours. They show good agreement with the Beard-Chuang model for equivalent diameters up to 6 mm. A fitted equation is used for T-matrix calculations to derive the specific attenuation for horizontal and vertical polarizations at 20 GHz. When compared with the calculations using approximated oblate spheroids, good agreement is obtained for most cases. However, unusual drop size distributions (DSDs) with large median volume diameter can give rise to some differences and for such cases, the fitted equation would need to be used. Also evaluated is the impact on cross-polar discrimination versus co-polar attenuation variation. For the earth-space scenario considered here, no significant difference is observed between the calculations using the contoured shapes and their oblate spheroid approximations. Both show good agreement with 1-year of beacon measurements at 19.7 GHz.
1 citations
Journal Article•
TL;DR: In this article, the main parameters in detecting raindrop size distribution are overviewed, and the traditional measuring methods are discussed separately, most of them possess the shortcomings of low measurement precision, big error, workload and poor real-time response.
Abstract: The main parameters in detecting raindrop size distribution are overviewed,and the traditional measuring methods are discussed separately.Most of them possess the shortcomings of low measurement precision,big error,workload and poor real-time response.New type measurement raindrops spectrum toollaser disdropmeter are developed,and the measurement principle of disdropmeter are analyzed in detail. Compared to traditional measurements,the virtues of disdropmeter in detecting raindrop size distribution are pointed out.The applications of disdropmeter,such as raindrop size distribution,rainfall measurement and the correction of weather radar et al are given.The developments of laser disdrometer technology at home and abroad are displayed.The research work progress on laser disdrometer of the Key Laboratory of Atmospheric Composition and Optical Radiation,CAS,is introduced.The experiments carried out with laser disdrometer in recent years are simply discussed.
1 citations
TL;DR: In this article, the authors developed a new axis-ratio relation with the 2DVD, wich is compared with other axis ratio relations already known in the literature, and applied also polarimetric rainfall algorithms to calculate the rain by utilizing as inputs polarIMetric parameters, which are both measured by the radar and simulated by the disdrometer.
Abstract: The submitted paper talks about the development of a new axis-ratio relation with the 2DVD, wich is compared with other axis-ratio relations already known in the literature. The Authors applied also polarimetric rainfall algorithms to calculate the rain by utilizing as inputs polarimetric parameters, which are both measured by the radar and simulated by the disdrometer, according to the considered axis-ratio relations. Both radar and disdrometer rainfall estimates are then compared with rain gauges measurements. Another goal of the present work is to corrected horizontal reflectivity and differential reflectivity biases affecting radar estimates by comparing radar and 2DVD disdrometer polarimetric parameters. Gauge data are considered as truth. The topics of the paper
1 citations