Figure 10. Traps being removed from the surf zone 



transport rate data onsite is considered one of the important advantages of 

 using traps, enabling a quality control check on trap operation and early 

 interpretation of results for adjustment of experimental design. 



Transport Rate Analysis 



26. Procedures for calculating transport rates from the raw data are 

 described in this section. The streamers measure a sand flux, i.e., the 

 weight of sand passing through the nozzle of a certain cross-sectional area 

 during the sampling interval. If sampling is performed in a unidirectional 

 flow, as was the case in these experiments, no sand coarser than 0.105 mm is 

 lost once it has entered the streamer, and the flux can be directly associated 

 with the current to develop predictive empirical relations . The raw data of 

 sand weight collected in the streamers are listed in Table Al of Appendix A. 



22 



