Abstract:

The rule of wind speed in the aweather area of the firebreak tree belt with three structures (sparse structure, tight structure and ventilate structure) was tested using simulating method in the wind tunnel experiment. The isogram of relative wind speed in the aweather area of firebreak tree belt with the three structures were drawn. Based on the feature of the wind speed, the forecasting models of wind speed in the aweather area of the firebreak tree belt had been established using the multi_model optimization. The results showed that the minimal relative wind speed in the windward area of firebreak tree belt with a sparse and tight structure was down to 70% below , but in the windward area of the ventilate structure was only down to about 80%. The sparse and tight structure had a better effect of shelterbelt than the ventilate structure in the windward area of the firebreak tree belt. The firebreak effect of the sparse structure was the best.

Key words: firebreak tree belt, wind tunnel, aweather area, structure of firebreak tree belt, mathematical model