I think this is as simple as removing the square brackets and correcting your interval- the command should look like this:
Code: Select all
:TransientParameter IMPERM LANDUSE
1980-11-01 12:00:00 0.5 4
0.5
1.0
1.0
0.5
:EndTransientParameter
Here, 4 is the number of data points in the time series, and 0.5 is the time interval, in days, i.e., 12 hours (you had 30 in your example, which implies an interval of 30 days, which is unfortunately not supported at this time, thus the warning - the largest interval is 1d). For permafrost representation, you'll likely want to set an interval of 1 day and just create a long annually repetitive time series. Note that v2.9.1 of Raven, appearing any day now - likely this week, will simplify the process of representing annually cyclical monthly time series.