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




20-11-2013 Study Water Demand in Urban areas

Photo: Tineke Dijkstra/Hollandse Hoogte, Beeldbank Deltaprogramma

In recent months, DeltaSync was commissioned by the Ministry of Infrastructure and the Environment to perform a study on the water demand of urban areas. In particular this concerns the additional water demand...[more]



18-11-2013 TEDxTalk Rutger de Graaf online

This week the TEDx video of Rutger de Graaf was published online. In this video he is talking about the need of floating cities.

Most of the bigger cities in the world are located along the coast. Every day around 150.000 people move to the city. This means that in 2100 4.5...[more]


04-10-2013 Seasteading Crowdfunding Campaign Ends Successfully!

The crowdfunding campaign launched by Seasteading Institute was a huge success, thanks to all 291 contributors who helped smash the $20,000 goal and bring the dream of creating the first floating city one step closer. Check out the project on Indiegogo or read more about it in...[more]




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