Vol.3, No 1, 2004
pp. 33-39
UDC 625.85:551.524(045)=20
THE INFLUENCE OF MICRO LOCATION
ON THE AIR FREEZING INDEX
Branko Mazić
University of Sarajevo, Civil
Engineering Faculty, Republic of BiH
Abstract. In this paper are exposed
research results of air freezing index values occurring in area of
Bosnia and Herzegovina. Theoretic probabilities of air freezing index
occurrence are calculated, based on data of 26 meteorologic stations,
in order to deterimine its return periods of appearing (the probability
of air freezing index appearance average once in period considered). To
this purpose five the most frequent in praxis theoretic distribution
functions are used: GAUSS, GALTON, LOG-PEARSON, PEARSON and GUMBEL. As
the most appropriate function for all meteorogic stations the
LOG-PEARSON was sellected because it on the best way approximates
values of calculated air freezing index.
Regarding to influence of micro location on the value of air freezing
index some independent parameters of location, which are measurable
(variables) and have supposed influence, are took in analysis. To this
purpose the mathematic model of multi variant regression analysis was
used and the regression equation of the associated influence of
independent parameters was determined. Using this discovered equation,
designers of road pavement can for each micro-location cutted by the
road line, calculate the air freezing index and check the pavement
structure on the harmful freezing effects.
Key words: negative air
temperature, air freezing index, micro location.
UTICAJ MIKRO LOKALITETA
NA VELIČUNU INDEKSA MRAZA ZRAKA
U ovom radu izloženo je istraživanje veličine
pojave indeksa mraza zraka na teritoriji BiH. Sračunate su teoretske
vjerovatnoće pojave indeksa mraza zraka na 26 obrađivanih meteoroloških
snanica, sa ciljem da se definišu njihovi povratni periodi javljanja
(vjerovatnoća pojave prosječno jedanput u razmatranom periodu). Za ovu
analizu korišteno je pet najčešće u praksi teoretskih funkcija
raspodjele: GAUS, GALTON, LOG. PEARSON, PEARSON i GUMBEL. Za teoretsku
funkciju raspodjele kod svih meteoroloških stanica usvojena je funkcija
log. Pearson, jer ona najbolje aproksimira sračunatim vrijednostima
indeksa mraza zraka.
Za istraživanje uticaja mikrolokaliteta na veličinu indeksa mraza zraka
uzete su nezavisno promjenljive veličina za koje se pretpostavljalo da
utiču, i koje se mogu numerički izraziti. Primjenjen je matematički
model multivarijantne regresione analize i dobijena je jednačina
združenog uticaja. Otkrivenom zakonitošću projektanti kolovoznih
konstrukcija mogu da na bilo kom mikrolokalitetu, kuda putni pravac
prolazi, sračunaju indeks mraza zraka i provjere kolovoznu konstrukciju
na štetno dejstvo mraza.
