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Storm wave study could help improve design of coastal defenses

Date:
October 14, 2016
Source:
University of Edinburgh
Summary:
Coastal defenses could be designed to better withstand powerful storms triggered by climate change, a study of wave dynamics suggests. Improving seawalls could help limit loss of life and damage to property as coastal waters become stormier over coming years, researchers say.
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Coastal defenses could be designed to better withstand powerful storms triggered by climate change, a study of wave dynamics suggests.

Improving seawalls could help limit loss of life and damage to property as coastal waters become stormier over coming years, researchers say.

The team has developed a way of predicting what happens to the millions of tonnes of water inside big waves when they collide with cliffs, seawalls and buildings.

Their findings could help engineers design coastal defenses that are better able to stop sea water spilling over on to land -- known as overtopping.

When a breaking wave collides with an upright structure, a powerful jet of water is thrown straight up into the air. Researchers found these huge sheets of water then split into several 'fingers' before breaking apart into a spray of droplets, which can hit people and property with real force. Saltwater can also cause damage to buildings, vehicles and transport infrastructure.

Scientists at the University of Edinburgh and Hokkaido University recreated stormy sea conditions in a 24m wave flume in Japan to gauge the impact of waves on vertical walls.

A scaled-down version of a seawall was bombarded with waves, which researchers tracked using a high-resolution video camera. They found that water is dispersed in a distinct pattern that varies depending on the size of waves. The pattern differs from those produced by other types of spray, such as those produced by industrial sprayers used in car and agriculture industries.

Based on their findings, researchers developed a statistical model to calculate the pattern of spray produced by wave impacts. This could help inform future sea defense strategies which have until now not taken into account the pattern of spray produced by waves, the team says.


Story Source:

Materials provided by University of Edinburgh. Note: Content may be edited for style and length.


Journal Reference:

  1. Y. Watanabe, D. M. Ingram. Size distributions of sprays produced by violent wave impacts on vertical sea walls. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science, 2016; 472 (2194): 20160423 DOI: 10.1098/rspa.2016.0423

Cite This Page:

University of Edinburgh. "Storm wave study could help improve design of coastal defenses." ScienceDaily. ScienceDaily, 14 October 2016. <www.sciencedaily.com/releases/2016/10/161014152250.htm>.
University of Edinburgh. (2016, October 14). Storm wave study could help improve design of coastal defenses. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2016/10/161014152250.htm
University of Edinburgh. "Storm wave study could help improve design of coastal defenses." ScienceDaily. www.sciencedaily.com/releases/2016/10/161014152250.htm (accessed May 26, 2017).

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