Characterization of subglacial landscapes by a two-parameter roughness index

Li Xin, Sun Bo, Martin J. Siegert, Robert George Bingham, Xueyuan Tang, Dong Zhang, Xiangbin Cui, Xiangpei Zhang

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Abstract

Previous studies using Fourier Transformation (FT) methods to analyze subglacial roughness have shown promise for discerning between different types of subglacial landscape from raw subglacial elevation data. In this paper, we derive a two-parameter FT roughness index {¿, ¿} where ¿ is based on the FT of elevation (as previously considered in isolation), and ¿ is based on both the FT of elevation and the FT of bed slope profile.. In this way, we take account of both vertical and horizontal irregularities in subglacial surfaces. We demonstrate the statistical veracity of using {¿, ¿} to consider roughness in terms of obstacle amplitudes and spacing, and consider the use of {¿, ¿} in studies of ice dynamics and subglacial geomorphological interpretation. We show that {¿, ¿} can be linked to basal sliding rates on the metre-scale, and can be used to differentiate further than single-parameter roughness indices between different classes of subglacial landscape, in particular between erosional and depositional settings.
Original languageEnglish
Pages (from-to)831-836
Number of pages6
JournalJournal of Glaciology
Volume56
Issue number199
DOIs
Publication statusPublished - Dec 2010

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    Xin, L., Bo, S., Siegert, M. J., Bingham, R. G., Tang, X., Zhang, D., Cui, X., & Zhang, X. (2010). Characterization of subglacial landscapes by a two-parameter roughness index. Journal of Glaciology, 56(199), 831-836. https://doi.org/10.3189/002214310794457326