Hello,
Does anyone know how HEC-RAS 4.1.0 calculates the D50 for the output? I am trying to analyze how the D50 of the bed is changing over time and when I plot the D50 after a period of time, there are several very large spikes in the plot. The spikes in D50 are created over just a few days. I tried to correlate the rapid rise in D50 to either deposition or scour of sediment by size fraction within the section using the “Mass Bed Change” ouput but there does not seem to be any relationship. My thought is that there is a model instability causing the incorrect reporting of the D50. Any thoughts?