They are larger than sand ripples on the beach but smaller than sandbanks. Sand waves largely determine the shape of the sea floor in the southern part of the North Sea. A good predictive computer model would be a valuable tool for shipping and designers of offshore infrastructures.
The mathematical equations describing the behaviour of sand waves have been known for some time. Yet suitable equations alone are not enough to predict their behaviour; the equations also need to be solved reliably. To date, no practical methods were available for solving these equations, especially for larger sand waves.
First of all, Van den Berg simplified the equations considerably. This made it much easier to find solutions and hence to predict sand wave behaviour. The result was a tool that could quickly predict the effect of interventions such as dredging. This model was used successfully to determine the recovery of sand waves after dredging of a trench for the new high-voltage cable from the Netherlands to England. Subsequently, Van den Berg developed efficient calculation methods to solve the original equations. In the end this resulted in a mathematical model that will possibly enable studies on the interaction between sand waves and sand banks in the future.
Predicting the growth and movement of these waves is vitally important for the safety of shipping and the design of offshore infrastructure, such as pipelines, cables and platforms.
Sand waves develop in loose sand on the bottom of shallow seas. This loose sand is transported by tidal currents, giving rise to wave patterns. These patterns disrupt the tidal flow and result in more sand being pushed on to the slope. Eventually, sand waves can reach a height of five to eight metres and due to the current they can continuously move and change shape.
Dr Joris van den Berg | alfa
World’s oldest known oxygen oasis discovered
18.01.2018 | Eberhard Karls Universität Tübingen
A close-up look at an uncommon underwater eruption
11.01.2018 | Woods Hole Oceanographic Institution
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy