Changes in riverbank position within the study area between January 2003 and January 2017. (a,b) Aquaculture infrastructure built between January 2003 and January 2017. (c) Map with locations of riverbanks for January 15, 2003, and January 29, 2017. Riverbanks were extracted from historical Landsat-7 and 8 imagery using the \(MNDWI\)59. Landsat-8 image from January 29, 2017, was used as background image. (d) Accretion and erosion along the northern riverbank (RKM \(-2\) to 17) between January 2003 and January 2017. (e) Accretion and erosion along the southern riverbank (RKM \(-2\) to 17) between January 2003 and January 2017. Riverbank migration, i.e. accretion and erosion, was calculated along lines orthogonal to the centre line of the river. Accretion corresponding to locations of aquaculture infrastructure was highlighted separately. Satellite images shown in (a and b) were provided by Google Earth (https://earth.google.com/web), based on data from Maxar Technologies for December 22, 2017. Landsat-7 and Landsat-8 images courtesy of the USGS, downloaded from the USGS EROS Center (https://earthexplorer.usgs.gov/). Illustrations (a–e) were generated using Matlab 2018a (http://mathworks.com).