Article (Scientific journals)
A fuzzy approach to the definition of standardized visibility in fog.
Boreux, Jean-Jacques; Duckstein, Lucien
1994In Applied Mathematics and Computation, 61 (2-3), p. 287-299
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Abstract :
[en] The problem of defining the physical concept of standardized visibility is addressed by means of a fuzzy logic approach. Assuming that several hypotheses hold, it is possible to evaluate a standardized visibility Vk (or meteorological visual range) as the ratio of a psychometric coefficient k and the extinction coefficient σ of the aerosol. The main disadvantage of this relationship due to Koschmieder stems from the fact that the meteorological visual range can be very different from visibility estimated by a human observer with normal sight. This is particularly true during fog extinction coefficient supplied by a transmissometer and the corresponding visibility evaluated by an expert. Calculations are performed according to two different approaches. First, a so-called fuzzy hyperbolic model based on a distance defined by Bardossy et al is presented, yielding a crisp (nonfuzzy) value of the coefficient k. Next, we use the multiplication of two fuzzy numbers, taken as triangular, to build an average fuzzy number k that accounts for the different values found in the literature. The defuzzification of k confirms the result obtained by the first approach.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Boreux, Jean-Jacques ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Surveillance de l'environnement
Duckstein, Lucien
Language :
English
Title :
A fuzzy approach to the definition of standardized visibility in fog.
Publication date :
1994
Journal title :
Applied Mathematics and Computation
ISSN :
0096-3003
eISSN :
1873-5649
Publisher :
Elsevier Science, New York, United States - New York
Volume :
61
Issue :
2-3
Pages :
287-299
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 September 2009

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