Wednesday, May 13, 2015

Highlights—The Power of Two: Bayhead Deltas

The stratigraphic record represents the net product of a combination of autogenic and allogenic processes, and deciphering the relative roles of each has proven challenging. Here, Simms and Rodriguez examine the influence of tributary junctions on the rate of shoreline progradation of bayhead deltas during sea-level fall. Using a simple numerical model that incorporates downstream changes in valley geomorphology under conditions of constant rate of sea-level fall and sediment supply, the data reveal that as bayhead deltas merge, the estuarine shoreline migrates seawards at increased rates. The results provide novel insights into the architecture of strata deposited during relative falls in sea level.

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