Figure A15 . 



Pumping suspended sediment sampler 

 (from Watts 1953) 



Samples were collected across the surf zone from a pier at 

 Crystal Pier near San Diego, California; organic material 

 tended to clog the nozzle and resulted in only 71 percent 

 of the samples being used in data analysis. In addition, 

 the sampler could only be deployed from a pier. Thornton 

 (1972) combined a pump with bed- load sediment traps in the 

 nearshore and surf zone at Fernandina Beach, Florida. The 

 traps sampled for 15 min, then doors on the bed -load traps 

 were shut and the collected sediment pumped out for 

 approximately 5 min. The bed-load traps tended to clog, 

 however, and get buried in heavy wave conditions. Thornton 

 estimated the efficiency of the system from 40 to 100 

 percent. Fairchild (1972) collected suspended sediment 

 samples for approximately 3 minutes in the New Jersey surf 

 zone and North Carolina nearshore zone using a tractor- 

 mounted pump sampler. Crickmore and Aked (1975) made a 

 series of point measurements above the bed in an estuary 

 with fine sediment using a vertical array of nozzles 

 feeding to a pump mounted on a boat; the sediment was 

 filtered out of the mixture, while the cumulative water 

 volume was recorded on a volumetric meter. Coakley et al . 

 (1979) measured samples on-offshore and longshore using a 



A25 



