A Forecasting Method for Forest Fires Based on the Topographical Classification System and Spreading Speed of Fire - The Forest Fire in Manba-machi, 1993 -

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  • 局所地形および延焼速度を考慮した林野火災被害区域予測法に関する研究―群馬県万場町の林野火災を例として―
  • キョクショ チケイ オヨビ エンショウ ソクド オ コウリョシタ リンヤ カサ

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Abstract

On April 27, 1993, a forest fire occurred in Morito area, Manba-city, Gunma-prefecture Japan. Under the prevailing strong winds, the fire spread and extended to the largest scale ever in Gunma-prefecture. <br>The author chartered a helicopter on May 5, one week after the fire was extinguished, and took aerial photos of the damaged area, and investigated the condition of the fire through field survey and data collection. The burnt area extended over about 100 hectares, and the damage amounted to about 190 million yen (about two million dollars). The fire occurred in a steep mountainous area and under strong winds; therefore, wind and topography strongly facilitated the spreading. It is the purpose of this paper to report a damage investigation of the fire and to develop a forecasting method for forest fires based on the topographical analysis system and spreading speed of fire. In the first place, I analyze the topographical structure of the regions which became the object of this study with some topographical factors, and construct a landform classification map. Secondly, I estimate the potential danger of each region in the landform classification map according to the direction of the wind and spreading speed of fire. <br>In the present paper, I try to forecast forest fires in Morito area, and the basic results for the forecasting method of forest fires are obtained with the topographical classification system and spreading speed of fire.

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