The Shape of Fluvial Gravels: Insights from Fiji’s Sabeto River

This project aims to re-assess our understanding of the shape fluvial bedload gravels by drawing together existing information on gravel shape. At its crux, however, is interpretation a large, high-quality set measurements made from Sabeto River western Viti Levu, Fiji. work reveals that apparent simplicity displayed most studies downstream rounding disguises complex pattern stepwise reversals an angular state, result splitting cobble- and boulder-sized particles. Particle sphericity changes rapidly during initial stages transport. Along Sabeto, this seems be attrition, with breakage generating low continuing presence particles in system. Elsewhere, consequence sorting we speculate rivers globally exist along sorting–attrition continuum. The form not what would expected were dominant control form. Instead display relationship roundness (and thus abrasion). Fluvial appear evolve distinctive may offer means distinguishing products riverine deposition.