BARDEX LOGBOOK 09/07/08

Wednesday 09/07/08

EMs and Bed level sensors cleaned with soapy water

Series B2 continued [15, 15, 20, 5mono], rig adjustments and profiles, followed by sediment photos. The response of the morphology to the remainder of the run was to destroy the ripple field completely, and consolidate the small berm which developed at the runup limit, which was much more limited than seen under the longer period waves.

Checks made on EM and PT data from swash rigs. Cleaning seemed to make the improve the data, so this will now regularly happen.

Successful trial of vectrino synching

Bed level sensors surveyed, and change in heights computed – they have sunk by max 3cm at the seawards extent and max 2cm at landwards extent. The dry sensors have remained at approximately the same position

Offshore rig taken out of the water, and reprogrammed for another deployment. Some issues with data collection and downloads on ADV and SRP. The ADV did not collect data successfully because it was not issued with the command ‘deploy’ before deployment. The SRP failed to respond to established routines to download the data, once again.

Offshore rig deployed, and water levels pumped for series C3 to begin – sea 2.5, lagoon 1.5, Hs=0.8, Tp=3
Began series [5,5,5,5,10,10], will finish the run tomorrow. The response of the profile so far has been very mild – very slight accretion of the berm, and little change elsewhere. Once again the data was logged overnight to record the re-equilibriation of the groundwater table before the recommencing of series C3 tomorrow morning.

Little is known about the sediments we are using, so Nicole and David measured the a, b, and c axes of pebbles, for quantification of angularity, using callipers. Deltares will source scales so some proper and independent particle size analysis using sieves can occur