Das Waldbrandrisiko in den Bayerischen Staatsforsten

Kroth, W.; Zang, P.

doi:10.1007/bf02753261

Cited by 1 publication

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“…Nevertheless, owing to the need for an extremely high light-enhancement factor and owing to the fact that most glass fragments lie at random positions on the forest floor without having their focal distance to the litter target, such glass-induced fires must be rare. This is verifiable in the forestfire statistics where this source of fire falls under the category of 'remaining other accidental causes' (Kroth and Zang 1971;Weber 2000) owing to its low probability.…”

Section: Discussionmentioning

confidence: 85%

An experiment to test the potential for glass fragments to ignite wildland fuels

Wittich

Müller

2009

Int. J. Wildland Fire

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It is current opinion that glass fragments can serve as an ignition source for grassland, bush and forest fires by focussing sunlight. In order to check the validity of this assumption, ignition experiments were conducted in the open over six litter samples taken from forests in northern Germany. Of several glass fragments, the five bottle bottoms best focussing sunlight were installed 15-50 cm above the litter materials. We found that one bottle bottom was able to slightly char spruce needles, beech leaves and blades of grass. Although this particular bottle bottom let the temperature increase up to 327 • C, flame formation did not occur. A secondary (but more realistic) experiment with a glass-bottle bottom lying on the litter led to a maximum temperature of 82 • C in the space between the litter and the glass fragment.Additional keywords: burning-glass effect, ignition experiments, light focussing.

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Section: Discussionmentioning

confidence: 85%