Forest steppe fire danger weather grade evaluation method based on dominant factor evaluation

Abstract

The invention discloses a forest steppe fire danger weather grade evaluation method based on dominant factor evaluation. Precipitation and wind speed are taken as dominant factors, then temperature and humidity are fused into a comprehensive index temperature and humidity as a basic factor, and finally, the moisture content of dead combustible materials on the surface of the forest steppe is taken as a qualitative grade for comprehensive evaluation, wherein there are five grades in total. The method not only considers the contribution of single factors such as atmospheric temperature, atmospheric humidity, rainfall, wind speed and moisture content of dead combustible matters on the fire danger grade of the forest steppe, but also considers the mutual contribution of the influence between every two factors and among multiple factors to the fire danger grade of the forest steppe. According to the method, a new index scoring standard is constructed, score values of all indexes in different seasons are given, a calculation formula for the fire danger weather index value (HTZ) of the forest steppe is given, and a calculation result is unified with the current standard.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and relates to technologies and methods for forest and grassland resources and environmental protection. More specifically, it involves a forest and grassland fire hazard weather rating method based on the evaluation of dominant factors. Background technique [0002] The forest and grassland fire risk weather rating mainly considers the impact of short-term changes in weather and meteorological elements on the flammability of forest and grassland combustibles, and the fire risk rating based on this is called the fire risk weather rating. [0003] The "National Forest Fire Dangerous Weather Level" (LY / T 1172-95) was formulated by Wang Xianxiang of the Heilongjiang Forest Protection Research Institute and others. Forestry industry standard, still in use today. [0004] In the standard, the weather level of forest fire danger is determined by the weather index of forest fire dang...

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Problems solved by technology

However, the temperature in spring is generally low, and the "A value" in most regions of the country is selected from the three values ​​of "0, 4, and 6", and there are very few areas that can score "12". Obviously, according to The results calculated by "HTZ=A+B+C+D-E" often fall into the first level (no danger) and the second level (low risk). The reason for this wrong result is mainly due to the contribution of the spring wind It is much larger than the "D value" given in Table 4, that is, the so-called "strong wind without wet wood"! For another example, after rainfall and snowfall, forest and grassland fires will basically not occur, and the weather levels of forest and grassland fire danger are mostly level one (no danger) and level two (low danger), but according to "HTZ=A+B+C+ The result calculated by D-E" may fall into level three (moderate risk) or even level four (high risk)

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