Study area in the lower Bengal Delta and coastal Bangladesh. White area is Bangladesh; light gray land areas are India, dark gray land area is the Sundarbans mangrove forest. Inset shows approximate locations of 2012 sediment trap deployment sites in the fluvial-tidal delta that are the focus of this study; numbers 5, 6, 7, and 8 mark the four sampling areas and correspond to the first digit in the individual site numbering scheme, e.g., 5.3.B; stars mark locations of 2008 sediment trap sites in the tidally-dominated delta (c.f., Rogers et al., 2013). Delta plain north of the Sundarbans and near to Khulna City is heavily embanked. DOI: https://doi.org/10.1525/elementa.250.f1