Detecting and Quantifying Morphological Change in Tropical Rivers Using Google Earth Engine and Image Analysis Techniques

Boothroyd, R.J. , Williams, R.D. , Barrett, B. , Hoey, T.B. , Tolentino, P.L.M. , Perez, J.E. , Guardian, E. , David, C.P. and Yang, X. (2020) Detecting and Quantifying Morphological Change in Tropical Rivers Using Google Earth Engine and Image Analysis Techniques. In: River Flow 2020: 10th Conference on Fluvial Hydraulics, Delft, Netherlands, 07-10 Jul 2020, pp. 1013-1021. ISBN 9780367627737

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Various tools have been demonstrated that are capable of delineating and characterizing river channels, but efforts to scale these analyses up to multi-temporal, catchment-scale applications are in their infancy. Here, we use Google Earth Engine (GEE) to extract the active channel (including the wetted channel and unvegetated, alluvial deposits) from the Bislak and Cagayan Rivers in the Philippines. Using temporal composites of Landsat 5, 7 and 8 satellite imagery over ~30 years, the active channel is resolved at annual intervals. The active channel occurrence frequency is mapped using image analysis techniques to detect large-scale planimetric change. Quantification of active channel centerline change is achieved using the RivMAP toolbox. Over a 135 km reach of the Cagayan River, the average migration rate was 17.5 m.a-1 ranging from 7.7 m.a-1 in 1988 to 37.0 m.a-1 in 2005. The findings quantify patterns of dynamism in tropical river systems and demonstrate the utility of GEE in fluvial geomorphology applications.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Barrett, Dr Brian and Tolentino, Pamela Louise and Boothroyd, Dr Richard and Williams, Dr Richard
Authors: Boothroyd, R.J., Williams, R.D., Barrett, B., Hoey, T.B., Tolentino, P.L.M., Perez, J.E., Guardian, E., David, C.P., and Yang, X.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Copyright Holders:Copyright © 2020 Taylor and Francis Group
First Published:First published in River Flow 2020: Proceedings of the 10th Conference on Fluvial Hydraulics (Delft, Netherlands, 7-10 July 2020): 1013-1021
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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