DEVEX-disdrometer evaluation experiment: Basic results and implications for hydrologic studies

Krajewski, Witold F.; Kruger, Anton; Caracciolo, C.; Golé, P.; Barthès, Laurent; Creutin, Jean‐Dominique; Delahaye, Jean-Yves; Nikolopoulos, Efthymios I.; Ogden, Fred L.; Vinson, Jean-Paul

doi:10.1016/j.advwatres.2005.03.018

Cited by 108 publications

(83 citation statements)

References 23 publications

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“…Automated disdrometers such as laser precipitation monitors have the capacity to accurately sample over the longer durations required by rainfall sampling studies. However, limitations on the measurement accuracy of drops below 0.2 mm remain due to drop splatter [152] and background noise [112]. Optical disdrometers claim to accurately count drop numbers, however, the reliability of these measurements has also not been verified or reported.…”

Section: Accurate Measurement Of the Number Of Rain Dropsmentioning

confidence: 99%

Rain Drop Measurement Techniques: A Review

Kathiravelu

Lucke

Nichols

2016

Water

118

108

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For over a century there have been many studies that describe the use of rain drop measurement techniques. Initial manual measurement methods evolved due to improved technology to include photographic and, more recently, automated disdrometer and laser measurement techniques. Despite these numerous studies, there have been few comparative reviews of the range of methodologies, and their relative performance. This review explores the raindrop measurement techniques available, and summarizes and classifies the techniques according to the method or principle involved. The requirements of a robust raindrop measurement technique are suggested, and these are reviewed against existing rain drop measurement techniques to provide a comparative guide to the use of the range of techniques available for any research study. This review revealed that while advances in technology have allowed many of the deficiencies of early techniques to be eliminated, challenges remain in relation to the precision of the measurement of the size, shape, and velocity of rain drops.

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Section: Accurate Measurement Of the Number Of Rain Dropsmentioning

confidence: 99%

Rain Drop Measurement Techniques: A Review

Kathiravelu

Lucke

Nichols

2016

Water

118

108

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“…In this paper we suggest to investigate more in depth the spatio-temporal (3 dimensions in space and 1 dimension in time) features of rainfall fields down to drop scale using data collected by a 2D video-disdrometer denoted 2DVD hereafter (see Kruger and Krajewski 2002, for a precise description of the device's functioning), deployed in the Ardèche region (South-East of France) in the framework of the HyMeX campaign (Ducrocq et al 2014), in an innovative way. Indeed this device has been extensively used as a reference in comparison with other rainfall measuring ones (Krajewski et al 2006, Tokay et al 2013 or to investigate drops and more generally hydrometeor shape (Battaglia et al 2010, Cao et al 2008, Thurai and Bringi 2005 Scaling laws are incompatible with a homogenous distribution (Poisson statistics), but it remains a debated topic. It has mainly been discussed in time by analysing drop counts over various time steps.…”

Section: ) Introductionmentioning

confidence: 99%

2DVD Data Revisited: Multifractal Insights into Cuts of the Spatiotemporal Rainfall Process

Gires

Tchiguirinskaia

Schertzer

et al. 2015

Journal of Hydrometeorology

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International audienceData collected during four heavy rainfall events that occurred in Ardeche (France) with the help of a 2D video disdrometer (2DVD) are used to investigate the structure of the raindrop distribution in both space and time. A first type of analysis is based on the reconstruction of 36-m-height vertical rainfall columns above the measuring device. This reconstruction is obtained with the help of a ballistic hypothesis applied to 1-ms time step series. The corresponding snapshots are analyzed with the help of universal multifractals. For comparison, a similar analysis is performed on the time series with 1-ms time steps, as well as on time series of accumulation maps of N consecutive recorded drops (therefore with variable time steps). It turns out that the drop distribution exhibits a good scaling behavior in the range 0.5-36 m during the heaviest portion of the events, confirming the lack of empirical evidence of the widely used homogenous assumption for drop distribution. For smaller scales, drop positions seem to be homogeneously distributed. The notion of multifractal singularity is well illustrated by the very high-resolution time series

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“…High resolution and quality observations are required for the task. Although most of our knowledge about rainfall comes from operational networks of rain gauges and weather radars, specialized instruments play increasing important role in filling resolution gaps (Krajewski and Smith, 2002;Krajewski et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Comparative rainfall data analysis from two vertically pointing radars, an optical disdrometer, and a rain gauge

Nikolopoulos

Kruger

Krajewski

et al. 2008

Nonlin. Processes Geophys.

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Abstract. The authors present results of a comparative analysis of rainfall data from several ground-based instruments. The instruments include two vertically pointing Doppler radars, S-band and X-band, an optical disdrometer, and a tipping-bucket rain gauge. All instruments were collocated at the Iowa City Municipal Airport in Iowa City, Iowa, for a period of several months. The authors used the rainfall data derived from the four instruments to first study the temporal variability and scaling characteristics of rainfall and subsequently assess the instrumental effects on these derived properties. The results revealed obvious correspondence between the ground and remote sensors, which indicates the significance of the instrumental effect on the derived properties.

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DEVEX-disdrometer evaluation experiment: Basic results and implications for hydrologic studies

Cited by 108 publications

References 23 publications

Rain Drop Measurement Techniques: A Review

Rain Drop Measurement Techniques: A Review

2DVD Data Revisited: Multifractal Insights into Cuts of the Spatiotemporal Rainfall Process

Comparative rainfall data analysis from two vertically pointing radars, an optical disdrometer, and a rain gauge

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