International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

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

Klaus-Peter Wittich A C and Tanja Müller B
+ Author Affiliations
- Author Affiliations

A Agrarmeteorologische Forschung, Deutscher Wetterdienst, D-38116 Braunschweig, Germany.

B Institut für Geoökologie, Technische Universität Braunschweig, D-38106 Braunschweig, Germany.

C Corresponding author. Email: klaus-peter.wittich@dwd.de

International Journal of Wildland Fire 18(7) 885-891 https://doi.org/10.1071/WF08069
Submitted: 6 May 2008  Accepted: 15 October 2008   Published: 27 October 2009

Abstract

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.


Acknowledgements

The authors thank Dr Barbara Ubysz (Fire Protection Laboratory, Raszyn, Poland) for providing the report on the burning-glass experiments in Poland, Peter Lex and Professor Wolfgang Durner for helpful discussions, and Professor Johann Goldammer (Global Fire Monitoring Centre, University of Freiburg, Germany) for initiating a survey in the Fire Paradox Network with respect to the burning-glass effect. A single positive reply came from Spain from Domingo Molina: in summer 2003, a glass-induced fire occurred on an open southern slope.


References


Anon . (1982) Omówienie: wyników badań zmierzających do ustalenia pożarów leśnych od porzuconego szkła i opakowań szklanych. Independent Forest Fire Protection Laboratory, Raszyn, Forest Research Institute. (Warsaw, Poland)

Atreya A (1998) Ignition of fires. Philosophical Transactions of the Royal Society of London. Series A: Mathematical and Physical Sciences  356, 2787–2813.
CrossRef | CAS |

Babrauskas V (2001) Ignition of wood: a review of the state of the art. In ‘Proceedings of the 9th International Interflam Conference’, 17–19 September 2001, Edinburgh, Scotland. pp. 71–88. (Interscience Communications Ltd: London)

Babrauskas V (2003) ‘Ignition Handbook.’ (Fire Science Publishers: Issaquah, WA)

Cheney P, Sullivan A (1997) ‘Grassfires – Fuel, Weather and Fire Behaviour.’ (CSIRO Publishing: Melbourne)

Fuquay DM , Baughman RG (1965) Can glass and metal containers start forest fires? Fire Control Notes  26, 3–5.


Geiger R (1933) Können herumliegende Bierflaschen einen Waldbrand verursachen? Forstwissenschaftliches Centralblatt  55, 523–526.


Gisborne HT (1936) Measuring fire weather and forest inflammability. USDA Circular Number 398. (Washington, DC)

Kroth W , Zang P (1971) Das Waldbrandrisiko in den Bayerischen Staatsforsten. Forstwissenschaftliches Centralblatt  90, 328–336.
CrossRef |

Müller T (2007) Wirkung von Glasscherben bei der Entzündung von Streuauflagen. Diploma Thesis, Technische Universität Braunschweig.

Müller T, Wittich K-P, Lex P , Durner W (2007) Verursacht Glas Waldbrände? Allgemeine Forstzeitschrift – Der Wald  62, 990–992.


National Wildfire Coordinating Group (2005) ‘Wildfire Origin and Cause Determination Handbook.’ NWCG Handbook 1, PMS 412-1, NFES 1874. Available at http://www.nwcg.gov/pms/pubs/nfes1874/nfes1874.pdf [Verified 13 August 2009]

Taylor WL (1930) The problem of fire in British forests. Forestry  4, 78–92.


von Deichmann V (1960) Über die Zünd- und Brenneigenschaften von Waldbodenbelägen. Forstwissenschaftliches Centralblatt  79, 352–361.
CrossRef |

Weber R (2000) Bushfire causes. In ‘Proceedings of the Seminar “FIRE! The Australian Experience” ’, 30 September–1 October 1999, University of Adelaide, Australia. pp. 39–44. (National Academies Forum: Canberra)

Wittich K-P , Lex P (2005) Waldbrände durch Glasflaschen? Allgemeine Forstzeitschrift – Der Wald  60, 625–626.



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