lifted in the water column when transported, the grains will experience a net 

 drift and accumulate under the nodes or antinodes . This should depend on 

 grain size to some extent (De Best and Bijker 1971). Holman and Bowen (1982) 

 assumed that suspended sediment transport was dominant and used the average 

 mass transport in the upper part of the boundary layer to calculate equilib- 

 rium shapes of beaches based on a Bagnold-type transport formula. Complex 

 three-dimensional geometries were derived by superimposing progressive waves 

 to obtain standing wave patterns alongshore and cross -shore. 



238. In some of the CRIEPI cases which started from the steep plane 

 slope of 1:10, considerable reflection was present (a reflected wave height of 

 0.4 ra superimposed on the wave height distribution), but the effect of the 

 reflected wave on the profile shape appeared to be very small (see Figure 14). 



measured 



Figure 14. Profile measured after 4.2 hr together with 

 the initial profile and wave height distribution 



Actually, as the bar grew in size and the seaward slope became steeper, the 

 bar should have promoted reflection, but it is surmised that the main effect 



81 



