Why are peatland fires in Johor so difficult to extinguish?

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Peatland Fires Present Unique Extinguishing Challenges Due to Subsurface Combustion

Peatland fires in Johor are exceptionally difficult to extinguish because they burn not only on the surface but also within the underground layers of organic soil. This phenomenon is driven by the physical characteristics of peat, which is rich in highly flammable organic material, allowing hidden embers to smoulder for extended periods, even after visible flames have died out. This necessitates specialised firefighting strategies, substantial water usage, and prolonged monitoring, with the complexity further amplified by varying peat depths, some reaching up to 20 metres.
Subsurface Smouldering and Recurring Fire Risk

The primary reason peatland fires are so challenging to control lies in their ability to burn underground. Unlike mineral soils, peat is composed of decomposed organic matter that is highly combustible. Once ignited, embers can persist deep within the peat layer, continuing to smoulder for weeks or even months. This hidden combustion makes early detection difficult and significantly increases the risk of fires reigniting, similar to how embers can remain in burning wood or rice husks long after the surface flames have subsided.
Influence of Peat Depth and Moisture Content

The depth of the peat layer directly impacts the difficulty of extinguishing these fires. With peat depths in Malaysia ranging from two metres to as much as 20 metres, firefighting efforts must contend with substantial volumes of combustible material. Furthermore, while peat soil naturally possesses a high moisture content, typically exceeding 100% and sometimes reaching up to 800%, prolonged hot weather and low rainfall can drastically reduce this moisture. This drying process makes the lightweight, porous peat structure highly flammable, allowing fires to spread both horizontally and vertically within the organic layers.
Extended Monitoring and Resource Demands

The nature of peatland fires demands extensive and continuous monitoring, along with the application of large volumes of water. The subsurface burning means that even when the surface appears extinguished, hidden embers can re-ignite the peat. Firefighting operations must therefore be sustained over extended periods, often weeks or months, to ensure all smouldering material is completely put out. This prolonged engagement, coupled with the need for specialised techniques, places significant demands on resources and personnel.

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Why are peatland fires in Johor so difficult to extinguish?

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