樹木への散水による耐火力の持続性について
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概要
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Generally trees have the fire prevention effect. It will ignite, if radiant heat exceeds about 13.95 kw/m^2, it has more fire prevention effect by sprinkling water to the tree crown. It is thought that such an effect is especially effective in the city area where the house crowds. And the experiment for proving this effect was conducted, for three days from August 29, 2001. On the experiment, a tree which sprinkled water, and a tree which did not sprinkle water were heated simultaneously for 30 minutes. And (1) Change of appearance , (2) Temperature, (3) Radiant heat, (4) Crown void ratio , etc. were measured. The strength of radiation was set as 11.63 kw/m^2. As a result, the following effect by sprinkling water was proved. (1) Not only temperature but radiation was decreased by sprinkling water. (2) By watering, temperature was able to be lowered quickly. (3) It was expected that the continuous watering is better than intermittently. (4) When exposed to radiation of 11.63 kw/m^2, the leaf of Osmanthus fragrans was able to avoid damage by a little of watering to the crown. (5) When exposed to the heat of 11.63 kw/m^2 for 30 minutes, there was no big change in the void ratio of the crown. Recently, the danger that the big fire will occur in the city area is very high when the occurrence of the big earthquake is forecasted. When the big fire by the big earthquake will break out in the future, it is thought that it is very effective to strengthen such fire prevention power of trees in order to prevent the early spread of a fire. And it is required to development of the watering equipment not only as the drip irrigation often used now but as the tree crown style. Such equipment is considered to be utilized as a tool for watering at the usual times, and to be utilized as a means for fire prevention in case of a fire. It became clear in this experiment that watering to the tree crown was more effective in order to exert the fire resistance of trees. It will be required, to be proving the effect of watering about the case where higher radiant heat is exposed, in future.
- 明治大学の論文
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