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A single-layer litter-moisture model for estimating forest-fire danger

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Abstract:

Moisture schemes which assess the water content of fine fuels are an essential part of many grassland and forest fire-danger rating models operated in countries suffering from drought. In this paper a fine-fuel moisture model is presented which is based on the water-transfer and heat-transfer equation. The model requires standard meteorological input variables in hourly (or shorter) time intervals to make the diurnal behaviour of fuel moisture visible. Nevertheless, it is kept simple for operational use. A validation with litter-moisture measurements in the range between 10 and 300 % (dry-weight basis) is presented using a small electronic weighing device installed inside a weather screen and in a grass canopy in the open. It provides acceptable results.

German
Streufeuchteschemata zur Abschätzung des Wassergehalts von abgestorbenen pflanzlichen Materialien sind wesentlicher Bestandteil aller größeren Waldbrandgefahrenmodelle. Das hier vorgestellte einfache Streufeuchtemodell basiert auf den Transportgleichungen für Wasser und Wärme. Da es lediglich die üblichen Standarddaten meteorologischer Beobachtungsnetze als Eingabe verlangt, eignet es sich für den operationellen Einsatz. Das Modell wird mit Streufeuchten im Bereich 10–300 % (bezogen auf das Trockengewicht) verglichen, die in einer Wetterhütte und auf einer offenen Grasfläche mittels einer elektronischen Waage gemessen wurden. Der Vergleich zeigt eine akzeptable Übereinstimmung.

Document Type: Research Article

DOI: https://doi.org/10.1127/0941-2948/2005/0017

Publication date: 2005-04-01

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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