30-09-2014 Measuring water quality underneath floating structures



This research is a collaboration between Tauw, Deltares, Deltasync and various Dutch universities, water boards and municipalities. It focuses on the impacts of floating urban developments on the water quality and ecology, which are currently largely unknown. Coverage of the water surface is known to influence air-water interactions and penetration of light, but knowledge on this subject is limited. This knowledge gap complicates the job of water authorities and municipalities in creating a policy framework, and therefore to regulate and facilitate the development of new floating projects.

In order to investigate the water quality around and under floating structures, a remote-controlled underwater drone equipped with several water quality sensors and a video camera, is currently being used to go under floating structures to collect data. The sensors allow to monitor the following water quality parameters: pressure (depth), temperature, conductivity, nitrate, ammonium, dissolved oxygen and turbidity.


The extracted data provides information on how the water quality parameters vary under floating structures. To understand whether the floating body has an effect on water quality, the data is compared to parameters from the same water body, but from zones unaffected by the blockage caused by the floating structure. As an example of this methodology, the figure below shows graphs where measurements from open water are easily compared to measurements under the floating structures. The presented data was collected from the Floating Pavilion, in Rotterdam.


Click the above image to see a larger version


In addition to the data from the sensors, the underwater drone also allows to collect footage of aquatic life, which is also a good indicator of water quality.


Based on the preliminary results from this study, it seems that the current small scale floating structures do not have a significant influence on water quality. Moreover, it was understood that underwater drones are suitable to use for water quality measurements, considering that they can easily go under floating structures to collect data (expensive and troublesome to access by other methods). However, with the used equipment, there are still some challenges to overcome such as the difficulty of knowing the exact location of the drone.

All the collected data and videos from several locations around The Netherlands are available in an online tool (www.climatescan.nl), which is constantly being updated with new data. This website aims at promoting knowledge transfer among stakeholders, and to help gaining insight on the environmental impact of floating solutions.

Finally, the video in the link below gives a general impression of the project:
youtu.be/IwuELH66L_c

For the presentation given at the Deltas in Times of Climate Change conference visit the following link:
youtu.be/x9JoF7_Dw-o


08-07-2013 Flood proofing critical infrastructure of Dordrecht

A case study on the critical infrastructure of Dordrecht has been carried out by students Tom den Ouden and Bob Souwer from the Rotterdam University of Applied Sciences. The objective was to look for quick-wins in flood proofing hotspot buildings within a critical infrastructure...[more]


24-06-2013 Connecting to the Floating Future

The Community of Practice Floating Construction (CoP) organized 'Connecting to the Floating Future', the 20th of june. The next step in collecting, sharing and building knowledge in the field of floating construction.[more]



27-03-2013 Newsletter

The latest DeltaSync newsletter is released.[more]


25-01-2013 BBC: Should we build new cities at sea?

BBC News interview with Bart Roeffen from DeltaSync at the Floating Pavilion in Rotterdam and the floating homes in Delft.

Link to BBC News[more]


23-12-2012 Seasons greetings

Our best wishes for a white Christmas and a bright New Year on a Blue Planet

[more]


19-11-2012 Public lecture: Blue Revolution

'About 70% of the earth surface is still used inefficiently. While on the land a transition has been made to organized agriculture, on the water we are still basically hunters and gatherers', according to Rutger de Graaf, lector Adaptive construction at the knowledge centre...[more]


26-10-2012 First watervillas launched in the Harnaschpolder of Delft

With great public attention and in the presence of Delft council member Stephan Brandligt (sustainable development), the first two floating foundations were launched. An exciting moment, because even for the builders it is not an ordinary job. Floating buildings are still a...[more]


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