BARDEX LOGBOOK 01/07/08

Tuesday 01/07/08

Series C1 – low lagoon (1m), MSL, Hs=0.8, Tp=4.5 (default waves, compensator on, new steering signal), beginning with an hour of default waves to reset the profile. Again the run ended with 5mins monochromatic default waves

· Gerd and Andy talked about the overwash experiments to come later in the month
· Video logging into avi was improved – dan worked out settings so no dropped frames, no compression, and reliable sample rate. In evening he wrote scripts to cut sequence into 1 minute chunks, properly time-stamped, clearing memory buffers, etc. He also finished the matlab scripts for the bardex sediment sizing, which is giving nice results
· Charlie worked out how to read the srp binary files into matlab
· Worked out that the wave statistics with and without wave reflection compensator were sufficiently different to warrant a new wave steering signal, which we will do from now on. No compensator (Friday, BB1 run 6) versus compensator (Monday, C2 run 6) shows that compensator reduces significant wave height by approx 10%
· The offshore rig was lifted on the barrier crest with the crane, and we began mounting the instruments at the end of the day. Problem with the sontek adv compass – appears to be a loose connection so Charlie and andre worked on that, however by the end of the day it was so hot they couldn’t open the casing to get to the electroinics.
· Srp - Charlie and Andre advised by Marine Electronics to check firewall and protocols, and IP on srp computer. All correct, no access. Found advice online and managed to open ftp site in windows explorer, which meant they could access and save configuration file. However, changing configuration file to ascii still results in binary files being stored. Set to sample 1 sweep per minute from 8am to 4pm on 02/07/08.
· Sontek adv – com pass not initialising. After opening and checking connections could initialise and read compass. However, not for long because next check and problem had reappeared. Deploy without – 25hz, 15min bursts, 10s buffer, from 08:00 on 02/07/08.
· Nortek vectrino working fine.

The response of the beach to series C1 was for the beach to steepen dramatically. One aim in the morning is to try to flatten the beach with a series of long waves, in order to remove the berm