Well-graded sediment refers to a sediment deposit that contains a wide range of particle sizes, often resulting in a dense, tightly packed structure. Well-graded sediments are significant in engineering geology and sedimentology for understanding the stability of sediments, the processes of sediment transport, and the design of foundations and embankments.
Reference: Holtz, R. D., Kovacs, W. D., & Sheahan, T. C. (2011). “An Introduction to Geotechnical Engineering.” Prentice Hall.