Izvorni znanstveni članak
Weather analysis during extreme forest fire on island of Brač from 14 to 17 July 2011
Boris Mifka
Višnja Vučetić
; Državni hidrometeorološki zavod, Zagreb, Hrvatska
Sažetak
During the forest fire burned on the island is a large area of approximately 5600 hectares of pine forests, underbrush, low vegetation, olive groves and vineyards in just a few days making it one of the biggest fires in Croatia. For the duration of the wildfire of 14 to 17 July 2011. on the island ground data were analyzed wind speed and direction, temperature and relative humidity from the climatological station Pain and Sutivan, with the main (hourly values) and automatic (10-min data) station Hvar, Makarska, Split-Marjan.
To estimate the risk of fire was applied to the Canadian method for calculating the index FWI (Fire Weather Index), which was demonstrated during the fire danger is very great. The fire after the beginning about 14 h in the bay Blace spread rapidly. Ahead of the fire at the ground The wind was blowing moderately to heavily impact on the south. Pain at the station relative humidity was 38% and maximum daily air temperature was 35 ° C for 15 h at the summer-time first day of the fire. Daily cycle of relative humidity was disrupted compared to normal. The numerical model ALADIN / HR are simulated vertical profiles of wind speed and direction over the fire on the first day of Bol. The modeled vertical wind speed profile shows a maximum wind speed in the lower troposphere around 9 m / s in a layer 390 m to 750 m, which affected the speed of fire spreading. The second day of fighting, there was a change in wind direction from south (SE) at Mistral (NW). It has caused a change in the direction of the spread of forest fires. However, to better link between weather and behavior of forest fires are necessary detailed information from the field, which would particularly help in predicting the occurrence of vegetation fires on the Adriatic.
Ključne riječi
wildland fire; FWI method; ALADIN/HR model; vertical wind profiles
Hrčak ID:
103617
URI
Datum izdavanja:
20.7.2012.
Posjeta: 1.139 *