A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography
During the last few decades, bed-elevation profiles from radar sounders have been used to quantify bed roughness. Various methods have been employed, such as the ‘two-parameter’ technique that considers vertical and slope irregularities in topography, but they struggle to incorporate roughness at mu...
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Cambridge University Press
2021
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ftdoajarticles:oai:doaj.org/article:41bebf03000244df9332dd2fa582d282 2023-05-15T13:45:45+02:00 A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography Shinan Lang Ben Xu Xiangbin Cui Kun Luo Jingxue Guo Xueyuan Tang Yiheng Cai Bo Sun Martin J. Siegert 2021-06-01T00:00:00Z https://doi.org/10.1017/jog.2021.12 https://doaj.org/article/41bebf03000244df9332dd2fa582d282 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143021000125/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.12 0022-1430 1727-5652 https://doaj.org/article/41bebf03000244df9332dd2fa582d282 Journal of Glaciology, Vol 67, Pp 560-568 (2021) Antarctic glaciology glaciological instruments and methods radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2021 ftdoajarticles https://doi.org/10.1017/jog.2021.12 2023-03-12T01:30:57Z During the last few decades, bed-elevation profiles from radar sounders have been used to quantify bed roughness. Various methods have been employed, such as the ‘two-parameter’ technique that considers vertical and slope irregularities in topography, but they struggle to incorporate roughness at multiple spatial scales leading to a breakdown in their depiction of bed roughness where the relief is most complex. In this article, we describe a new algorithm, analogous to wavelet transformations, to quantify the bed roughness at multiple scales. The ‘Self-Adaptive Two-Parameter’ system calculates the roughness of a bed profile using a frequency-domain method, allowing the extraction of three characteristic factors: (1) slope, (2) skewness and (3) coefficient of variation. The multi-scale roughness is derived by weighted-summing of these frequency-related factors. We use idealized bed elevations to initially validate the algorithm, and then actual bed-elevation data are used to compare the new roughness index with other methods. We show the new technique is an effective tool for quantifying bed roughness from radar data, paving the way for improved continental-wide depictions of bed roughness and incorporation of this information into ice flow models. Article in Journal/Newspaper Antarc* Antarctic Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Antarctic Journal of Glaciology 67 263 560 568 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic glaciology glaciological instruments and methods radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Antarctic glaciology glaciological instruments and methods radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Shinan Lang Ben Xu Xiangbin Cui Kun Luo Jingxue Guo Xueyuan Tang Yiheng Cai Bo Sun Martin J. Siegert A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography |
topic_facet |
Antarctic glaciology glaciological instruments and methods radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
During the last few decades, bed-elevation profiles from radar sounders have been used to quantify bed roughness. Various methods have been employed, such as the ‘two-parameter’ technique that considers vertical and slope irregularities in topography, but they struggle to incorporate roughness at multiple spatial scales leading to a breakdown in their depiction of bed roughness where the relief is most complex. In this article, we describe a new algorithm, analogous to wavelet transformations, to quantify the bed roughness at multiple scales. The ‘Self-Adaptive Two-Parameter’ system calculates the roughness of a bed profile using a frequency-domain method, allowing the extraction of three characteristic factors: (1) slope, (2) skewness and (3) coefficient of variation. The multi-scale roughness is derived by weighted-summing of these frequency-related factors. We use idealized bed elevations to initially validate the algorithm, and then actual bed-elevation data are used to compare the new roughness index with other methods. We show the new technique is an effective tool for quantifying bed roughness from radar data, paving the way for improved continental-wide depictions of bed roughness and incorporation of this information into ice flow models. |
format |
Article in Journal/Newspaper |
author |
Shinan Lang Ben Xu Xiangbin Cui Kun Luo Jingxue Guo Xueyuan Tang Yiheng Cai Bo Sun Martin J. Siegert |
author_facet |
Shinan Lang Ben Xu Xiangbin Cui Kun Luo Jingxue Guo Xueyuan Tang Yiheng Cai Bo Sun Martin J. Siegert |
author_sort |
Shinan Lang |
title |
A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography |
title_short |
A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography |
title_full |
A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography |
title_fullStr |
A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography |
title_full_unstemmed |
A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography |
title_sort |
self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography |
publisher |
Cambridge University Press |
publishDate |
2021 |
url |
https://doi.org/10.1017/jog.2021.12 https://doaj.org/article/41bebf03000244df9332dd2fa582d282 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Journal of Glaciology |
genre_facet |
Antarc* Antarctic Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 67, Pp 560-568 (2021) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143021000125/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.12 0022-1430 1727-5652 https://doaj.org/article/41bebf03000244df9332dd2fa582d282 |
op_doi |
https://doi.org/10.1017/jog.2021.12 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
263 |
container_start_page |
560 |
op_container_end_page |
568 |
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1766230555105427456 |