A spectral-based method for reconstructing spatial distributions of soil surface temperature during simulated fire events |
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Authors: | R. Lugassi E. Ben-Dor |
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Affiliation: | a The Porter School of Environmental Studies, Tel-Aviv University, Israel b The Remote Sensing and GIS Laboratory, Department of Geography and Human Environment, Tel-Aviv University, Israel c Soil Erosion Research Station, Rupin, Israel |
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Abstract: | Heterogeneous heat was applied to a homogenous soil surface to simulate a natural fire event. Subsequently cooled soil samples were evaluated spectrally and a spectral-spatial cube was generated corresponding to the burned area. Heat-induced spectral changes associated with thermal effects on soil minerals were observed across the entire spectrum, including: soil color changes (iron-oxide transformation); shifting absorption bands (iron-oxide transformation and illite/calcite ratio); changes in spectral shape (illite/montmorillonite ratio); disappearing absorption features (unknown); and changes in the overall brightness (soot). A model was developed using Partial Least Squares (PLS) to predict maximum soil surface temperatures, measured using thermocouples, from soil spectral reflectance. Thus, this proof-of-concept study demonstrates that soil spectroscopy reveals important information about soil temperature history and as such, represents a promising tool for viewing fire events retrospectively. |
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Keywords: | Fire Maximum soil surface temperatures Soil spectroscopy Imaging spectroscopy Deformation of soil minerals |
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