braid delta

A braid delta is a coarse-grained delta formed when a braided river system progrades into a body of standing water. These deltas are composed primarily of gravel and sand, distinguishing them from other delta types that typically consist of finer sediments. Braid deltas develop from well-defined, highly channelized braided rivers that have deeper and more sustained flow compared to streams that form alluvial fans. The braided river system that ultimately forms the braid delta may originate far from the standing water body and can consist of large alluvial plains. During glacial periods, rivers carrying meltwater and sediment from glaciers often developed braided-channel patterns, depositing thick sequences of sand and gravel.123