Wave‐climate asymmetry influence on delta evolution and river dynamics

On wave-influenced river deltas, wave-driven sediment redistribution affects progradation, and therefore avulsions, while avulsions change where is delivered to the coastline, affecting coastline shape. Coastline shape, in turn, rates patterns. Here we use a numerical model investigate how asymmetry of wave climates delta avulsion behaviors, which are coupled with shape evolution. Increasing wave-climate tends reduce (increase) curvature updrift (downdrift) flanks, by increasing (decreasing) local shoreline diffusivity. In our experiments, reduced restricts possible post-avulsion mouth locations, increased expands downdrift favoring “downdrift avulsions.” However, under some climates, diffusivity on flank can become negative, leading convexity accretion, inhibiting avulsions. heights decreasing superelevation threshold for both tend morphologic asymmetry, tendency.