Desig n Problem longshore Transport 



Page no ; 

 Calculated by: 



visual Nav^ Observations - Longshore Energq_ 



During summer monttis, visual observations 

 of surf conditions were mode on AssQteague 

 Island. Data are available only for Julij s. 

 August and indicate conditions for these 

 months only. Monthly hind cast data will be 

 used to supplement the visual data and 

 extra po late to annual longshore energy vo/ues. 



Visual observations produce data on 

 breaker height., period and wove direction. 

 The longshore component of wave energy can 

 be computed from Figure 4 -34- or from equation!* 



Visual Observations - Jul y , I97Z 



Average = -4.<o2 x lo'' 

 % Measured clockv^ise from shoreline by observer 

 looking seaward perpendicular to shoreline. . 

 ^^ Pz^ 0. 141 /og*^^ f///» cos Ot s"^^b (assum ed dura tion of 

 vwave conditions is 24 hours ~ 6<o400 sec.) 



122oi 133 

 22 Mar 73 



8-122 



