BARDEX II
BARDEX II (Barrier Dynamics Experiment) is a research projected funded by the European Union and takes place in the Delta Flume in the Netherlands from May to July. The overall aim of the project is to increase our understanding of sediment transport processes on sandy beaches. The project is hosted by Deltares and 25 researchers from 9 different universities (Algarve, Bordeaux, Copenhagen, Delaware, New Hampshire, New South Wales, Plymouth, Southampton, Utrecht) are involved.
Monday, 13 August 2012
Cycle commute from de Goot to campsite
Dan Howe filmed the commute from de Goot to the camp site by strapping a camera on the handle bars. The video link is here: http://www.youtube.com/watch?v=d_I80ecshB0. Thanks Dan for contributing this steller piece of cinematography!
Monday, 2 July 2012
Overwash series continues
After a recreative visit to Amsterdam, the overwash series proceeds according to plan and schedule. Last week we finished D1 and D2; today we finished D3; and hopefully will finish D4 and commence with D5. Overwash depths are deliberately being kept shallow to avoid damage to the backbarrier. The downside is that the horizontal array of current meters are not seeing a lot of action, if at all. Thermal camera and video cameras are capturing the overtopping and overwashing nicely (see picture below).
Thursday, 28 June 2012
First overwash run
Today we finished first overwash run D1 (0.8 m high and 4 second waves) with the new instrument set-up. Bit of a slow start because the beach kept adjusting to the increasing water level by building up the nearshore bar. Finally with water level at 4.2 m overwash occurred. A deep channel rapidly developed at the back of the barrier which compromised the measurements somewhat. After brief discussion, it was decided to fill in the channel by hand to prepare for the next overwash run. After a solid 1 hour of digging, involving the entire team and two wheel barrows the beach is now ready for the next overwash run with 5 second waves.
Wednesday, 27 June 2012
Ready for overwash
Today a massive effort of the team. We rebuild the scaffold frame (some 2.5 m poles were practically covered and other were practically exposed); moved 15 bed-level sensors from the bottom of the beach to the top and back of the barrier; took out all Vectrino II and sheetflow probes; moved the three swash rigs to the back of the barrier and morphed them into 4 overwash rigs; moved back the video trolley and installed all the video ground control points; reconfigured the 2 vertical pressure sensor arrays into a cross-barrier pressure sensor array; and surveyed all new instrument positions in. The Deltaflume team had the wave paddle repaired very conveniently while we were adjusting our rigs. Bring on the overwash!
Tuesday, 26 June 2012
Arrival of the Portugese
BARDEX II has now been taken over by the Portugese (Ana, Barbara, Pedro and Rita) and the French (Bruno, Benjamin and Florent) in preparation for the overwash runs. Series A, B and C are now all successfully completed, and the tidal run provided a taster for what overwash will look like.
Thursday, 21 June 2012
All the way to New Zealand!
#Update: added even more heroic pictures
Heroic scenes today in the wave flume, as the University of New South Wales (Australia) boys, with aid from the other teams, dug a massive hole in the beach to retrieve their groundwater kit. After about 3 hours, the kit was retrieved, the holes were filled and the beach profile was restored to its original state.
Afterwards, test series B1 was run with waves of Hs=0.8 m and Tp = 8s (the same as series A1) in order to rebuild the bar. Based on the beach profile at the end of the day, it seems like we managed to create a (modest) bar indeed.
Heroic scenes today in the wave flume, as the University of New South Wales (Australia) boys, with aid from the other teams, dug a massive hole in the beach to retrieve their groundwater kit. After about 3 hours, the kit was retrieved, the holes were filled and the beach profile was restored to its original state.
Afterwards, test series B1 was run with waves of Hs=0.8 m and Tp = 8s (the same as series A1) in order to rebuild the bar. Based on the beach profile at the end of the day, it seems like we managed to create a (modest) bar indeed.
Wednesday, 20 June 2012
Groundwater effects!
Run A7 has given some problems. The accretionary swashes have really build up the beachface, but the combination of a very steep beach and high lagoon level has resulted in the development of groundwater drainage channels around the rig that have sufficient flow power to move sediment.
Thijs kneeling in the drainage channel trying to adjust sensor elevation.
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