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Evolutionary, multi-scale analysis of river bank line retreat using continuous wavelet transforms: Jamuna River, Bangladesh

Mount, Nick J.; Tate, Nicholas J.; Sarker, Maminul H.; Thorne, Colin R.

Authors

Nick J. Mount nick.mount@nottingham.ac.uk

Nicholas J. Tate njt9@le.ac.uk

Maminul H. Sarker m.sarker@cegisbd.com

Colin R. Thorne colin.thorne@nottingham.ac.uk

Abstract

In this study continuous wavelet transforms are used to explore spatio-temporal patterns of multi-scale bank line retreat along a 204 km reach of the Jamuna River, Bangladesh. A sequence of eight bank line retreat series, derived from remotely-sensed imagery for the period 1987-1999, is transformed using the Morlet mother wavelet. Bank erosion is shown to operate at several characteristic spatial and temporal scales. Local erosion and bank line retreat are shown to occur in short, well defined reaches characterised by temporal persistence at the same location, and separated by relatively stable reaches. In contrast, evidence of downstream propagation of bank line retreat patterns is evident at larger spatial scales. The intensity of localised bank line retreat (i.e. at scales of 0 - 20 km) is strongly related to the magnitude of monsoonal peak discharge, but this relationship weakens as the spatial scale of erosion increases. The potential of continuous wavelet analysis to enhancing our understanding of morphological evolution in complex fluvial systems with multi-channel planforms is discussed.

Journal Article Type Article
Publication Date Feb 1, 2013
Journal Geomorphology
Print ISSN 0169-555X
Electronic ISSN 0169-555X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 183
Institution Citation Mount, N. J., Tate, N. J., Sarker, M. H., & Thorne, C. R. (2013). Evolutionary, multi-scale analysis of river bank line retreat using continuous wavelet transforms: Jamuna River, Bangladesh. Geomorphology, 183, doi:10.1016/j.geomorph.2012.07.017
DOI https://doi.org/10.1016/j.geomorph.2012.07.017
Keywords Continuous Wavelet Transform, Jamuna River, Braided river, Time-space, Erosion processes, Embayment pattern, Sediment wave
Publisher URL http://www.sciencedirect.com/science/article/pii/S0169555X12003492
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information NOTICE: this is the author’s version of a work that was accepted for publication in Geomorphology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Geomorphology, 183 (2013) doi: 10.1016/j.geomorph.2012.07.017

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