Hyperpycnites are deposits of a distinct style of flow that represents a mix of sediment and water that is denser than the water into which the mix flows; these types of deposits commonly are interpreted in the context of fluvial discharge into standing bodies of water. Here, Saitoh and Masuda test conceptual and experimental models of hyperpycnal flow deposits by exploring spatial variability in subaqueous flood deposits in cores from a lake in Japan with limited wave or tide reworking. The results clearly indicate that a single flood event can produce multiple eposides of waxing and waning flow, and the nature and controls on spatial variability in the sedimentology of the resultant deposits. The results suggest the absence of a direct correlation between paleo-flood frequency or intensity and the sedimentary record.
Spatial Change of Grading Pattern of Subaqueous Flood Deposits in Lake Shinji, Japan by Yu Saitoh and Fujio Masuda