TABLE I 

 Accumulative fraquency of V/ave Height and State of the Sea 



Accumulative 



frequency Wave height not exceeding 



Fehmarnbelt Borkumriff_ Amrumbank 



State of the Sea 

 not exceeding 



Percent 



Meters 



Meters 



Meters 





25 



0.3U 



0o66 



0.58 



2 



50 



0o60 



lo08 



1.20 



3-U 



75 



1.05 



1.60 



2.00 



4-5 



90 



1.60 



2,10 



2„80 



5-6 



95 



2o00 



2.50 

 8.50 



3.20 

 5.00 





Maximum 



3ol0 



8-9 



A determination of the wave-length frequencies were attempted 

 but great discrepancies were found. A plotting of frequencies of type 2 

 has been omitted. Figure 21^. shoT;s the frequency percentage of the number 

 of wave crests passing per minute and or the wave lengths for the light- 

 ship FEHMARNBELT. In the case of these observations, frequencies varied 

 between 28 and 10 waves per minute and the wave lengths between 7 and 

 56 meters. 



Wave Dimensions for Different States of the Sea 



a. Relation between wave dimensions and states of the sea , - The 

 differentiation between sea disturbances on a scale (Douglas Sea Scale) 

 0-9 is generally based upon the impressions of the observer who bases 

 his Judgment upon tradition and experience (4., p. 33). On several 

 occasions it was found that the estimated relative states of the sea 

 were not always associated with the saro.e appearance of the water sur- 

 face (1). For this reason there are no generally applicable fixed re- 

 lations between wave dimensions and states of the sea nor can definite 

 degrees of sea disturbance (Douglas Sea Scale) be associated with 

 fixed wave dimensions for definite positions (2)„ 



For evaluation of the state of the sea, it is desirable to 

 know the wave dimensions associated with the respective states of the 

 sea, ibr this purpose mean values and degree of scatter can be given. 

 Mean values are utilized in the correlation of states of the sea bo 

 wave heights in frequency diagrams. 



b, Tfave heights for different states of the sea , - The relation 

 between wave heights and states of the sea was investigated by utiliz- 

 ing a number of diagrams and tables. Figure 25 represents data compiled 

 by observer VII from lightship AUSSENEIDER, who reported that he estimat- 

 ed the state of the sea on the basis of v/ave dimensions, unlike the 

 methods of other mariners, Each dot on the graph represents a recorded 

 observation and the signs adjacent to these dots denote the presence of 



