Long Waves in Canals and Standing Waves in Closed Basins 233 



at 21-00 G. M. T. The numbers at the heavy dots at the coasts also contained 

 in Fig. 98 a give the water levels as derived from observations by Rossiter 

 (1954). The differences between the observed and computed values along 

 the coast are 0-5 m only at some places and will hardly exceed this amount. 

 Since there are no current observations from the time of the Holland 

 Storm, it is not possible to check the theoretical current values. The 



5<f 



BBfc ■ . ,J- J> ^ 



&. 



i 



10" 



Fig. 98(a). Water level in the North Sea caused by the Holland-orkan (according to 



Hansen, 1956). 



course (progress and intensity) of the surge at the coast of the North 

 Sea is in a generally good agreement with water-level recordings. Although 

 the results of this first computation of a heavy surge in a marginal sea are 



