Add curve smoothing options to display for deposited thickness

[GeoMattB]

this rolling window smooth function plots an interesting thickness evaluation.
dtt=DThick_df.rolling(roll_win,center=True).max()-DThick_df.rolling(roll_win,center=True).min()

Also this
dtt=DThick_df.rolling(roll_win,center=True).mean()

Evaluating thickness as a proxy for sediment supply, needs to be linked back to upstream sediment supply perhaps?
Complex, but as a start a rolling window smoothing over the deposited thickness is an interesting start to evaluating this.