申論題

3. Based on the Douglas sea scales, The following are parts of the tables of the state of the sea (The wind generated waves) and the state of swell (The background swell).
State of the sea (wind sea) - Table 1 (partly)

State of the Swell - Table 2 (Partly)



Remark: The sea name & degree was decide by the wave height H ,checking from the Table 1 directly.
The swell name & degree was decide by combine both of the wave length name & wave height name, which can finder the Table 2, then checked inside the Table 2 with this two names, finally fixed the swell name & degree.


The following wave was what you observed at sea at 18th noon time:
Wave length (L= 220 m) and Wave height (H= 3 m)


Please answer the following questions:

(2) What is the swell degree of this wave? How to express it?