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.

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.

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, https://doi.org/10.1016/j.geomorph.2012.07.017

• Journal Article Type: Article
• Publication Date: Feb 1, 2013
• Deposit Date: Jan 29, 2015
• Publicly Available Date: Jan 29, 2015
• Journal: Geomorphology
• Print ISSN: 0169-555X
• Electronic ISSN: 0169-555X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 183
• 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
• Public URL: https://nottingham-repository.worktribe.com/output/712676
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0169555X12003492
• 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