Profile Line 230 
20 Surveys 
19 Sep 90 to 19 Oct 90 
a 
> 
© 
z 
£ 
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x - 
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& 
Ww 
250 300 350 
Distance from baseline, m 
Figure A6. Envelope of all surveys of profile line 230 
caused by the rapid development of the nearshore trough and the offshore 
movement of the bar. Seaward of 300 m, the bottom was stable and the 
influence of the errors previously discussed is more significant. 
One interesting feature that was measured for the first time at the FRF was 
large bed forms, or megaripples, which developed along some of the profile 
lines in the nearshore trough and seaward of the bar (Figure A7). These 
features are large enough to be felt by the wheels of the CRAB and are 
reflected in the data (the CRAB surveys the average elevation between the two 
back wheels). Because they appeared repeatedly from day to day, and were 
observed by the CRAB operators, there is convincing evidence that these 
features are not the result of the Geodimeter oscillations described previously. 
Appendix A Surveying 
