shallow converging channel is evaluated mathematically 

 for the cases of a channel of uniform depth with gradu- 

 ally varying breadth and a channel of uniform breadth and 

 gradually varying depth. Simple solutions are found for 

 the amplitude, celerity and length of the wave which in 

 some cases could describe the phenomenon of wave propa- 

 gation into natural estuaries to a first approximation. 



NO. 113 - June 1959 



"Behavior of Beach Fill at Virginia Beach, Virginia " by 

 G. M. Watts 



Comparative survey and sand sample data are analyzed to 

 determine the behavior of beach fill placed to restore 

 and nourish the beach at this resort location. Initial 

 restoration was accomplished in 1952-53 and sand nour- 

 ishment added periodically thereafter. Conclusions are 

 drawn that the restored beach has been virtually sta- 

 bilized by annual nourishment at the rate of about 2.5 

 cubic yards per lineal foot of shore. Periodic nourish- 

 ment at this rate is concluded to be the most economical 

 method of maintaining required beach dimensions. 



NO. 114 - June 1959 



" Laboratory Study of the Effect of Groins on the Rate of 

 Littoral Transport: Equipment Development and Initial 

 Tests " by R. P. Savage 



Waves are generated to impinge obliquely on a sand beach 

 in an outdoor laboratory wave basin. Alongshore movement 

 of sand due to wave action, both with and without groins, 

 is trapped and measured, procedures and equipment for 

 trapping, measuring and transporting entrapped sand to 

 the updrift end of the beach are described in detail. 

 Test results, such as cumulative weight of sand movement 

 relative to test duration, relative weight of sand trapped 

 in different profile zones and physical changes to profile 

 and beach and bottom contours, are graphically presented. 

 The rate of sand movement relative to applied wave energy 

 is compared with values obtained by other investigators. 

 Rates determined from small-scale laboratory data are 

 observed to fall below an extrapolated curve derived from 

 data from actual field tests. No positive conclusions 

 are drawn and further testing is underway. 



06 



