Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography

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Title:Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography
Creators:
de Lima, João L.M.P.; plima at dec dot uc dot pt; Department of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, Portugal
Silva Jr., Valdemir P.; Rural Federal University of Pernambuco, Department of Agricultural Engineering, Rua Dom Manoel de Medeiros s/n, Dois Irmãos, CEP 50910-130 Recife, PE, Brazil.
de Lima, M. Isabel P.; Department of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, Portugal.
Abrantes, João R.C.B.; Department of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, Portugal.
Montenegro, Abelardo A.A.; Rural Federal University of Pernambuco, Department of Agricultural Engineering, Rua Dom Manoel de Medeiros s/n, Dois Irmãos, CEP 50910-130 Recife, PE, Brazil.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 63, 3, pp. 220-227
Uncontrolled Keywords:rainfall, thermography, drop size distributions, drop diameters

Abstract

The infrared thermography has been successfully applied as a tool for high resolution imaging in different hydrological studies. This exploratory experimental study aimed at evaluating the possibility of using infrared thermography to determine the diameter of raindrops. Rain samples are collected on a pre-heated acrylic board, which is exposed to rain during an instant, and thermograms are recorded. The area of the thermal stains (“signatures” of the raindrops) emerging on the board is measured and converted to drop diameters, applying a calibration equation. Diameters of natural raindrops estimated using this technique were compared with laser disdrometer measurements; the Nash-Sutcliffe efficiency coefficient was used for evaluating the match between the resulting histograms of drop size distribution. Results confirm the usefulness of this simple technique for sizing and counting raindrops, although it is unsatisfactory in light rain or drizzle.

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Title:Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography
Translated title:Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography
Creators:
de Lima, João L.M.P.; plima at dec dot uc dot pt; Department of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, Portugal
Silva Jr., Valdemir P.; Rural Federal University of Pernambuco, Department of Agricultural Engineering, Rua Dom Manoel de Medeiros s/n, Dois Irmãos, CEP 50910-130 Recife, PE, Brazil.
de Lima, M. Isabel P.; Department of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, Portugal.
Abrantes, João R.C.B.; Department of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, Portugal.
Montenegro, Abelardo A.A.; Rural Federal University of Pernambuco, Department of Agricultural Engineering, Rua Dom Manoel de Medeiros s/n, Dois Irmãos, CEP 50910-130 Recife, PE, Brazil.
Uncontrolled Keywords:rainfall, thermography, drop size distributions, drop diameters
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:63
Number:3
Page Range:pp. 220-227
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8523
Item Type:Article
Deposited On:17 Dec 2015 12:39
Last Modified:17 Dec 2015 11:39

Citation

de Lima, João L.M.P.; Silva Jr., Valdemir P.; de Lima, M. Isabel P.; Abrantes, João R.C.B.; Montenegro, Abelardo A.A. (2015) Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography. Journal of Hydrology and Hydromechanics, 63 (3). pp. 220-227. ISSN 0042-790X

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