[swanmodel-users] Estimating DSPR for SWAN with limited data

[이시현학부생 <pet...@ha...>]

Dear Swan users,

In my SWAN simulations, the directional spreading parameter (DSPR) seems to
be important for the boundary wave conditions. However, the data available
to me are limited to Hs, TMM10, mean wave direction, wind speed, and wind
direction.

Since DSPR cannot be directly derived from these bulk parameters, I would
like to ask whether it should be estimated using assumed values. If so,
what criteria are typically used in practice (e.g., wind–wave alignment or
wind-sea versus swell conditions), and are there commonly accepted
reference ranges for DSPR?

Any guidance would be appreciated.

Best regards,
Sihyeon