International International Innovation Workshop on Tsunami, Snow Avalanche and Flash Flood Energy Dissipation 津波・雪崩・洪水ワークショップ 東北大学

background

Tsunami is one of the most serious natural disasters, as can be seen in Fig. 1. Tens of thousands of people lose their lives periodically.

fig1

Current counter-measures such as the Global Tsunami Warning System will play a more important role in the future. We may also consider a more active approach to mitigating Tsunami damage to minimize such tragedies with science, technology and innovation.

fig2

Objectived

After the two previous Tsunami Energy Dissipation Workshop, held in 2012 at Tohoku University, in Sendai, Japan and held in 2014 in Chamonix, France, we have decided to hold the 3rd workshop to deepen our concept, ideas for possible energy dissipation mechanisms and structural design as well as more human and social science approach such as trans-science approach including risk communication based upon the previous two workshop.
Other topics on utilization of the structures for daily life as local governmental purpose, private sector purpose for some production including renewable energy and energy transport will be also included in the purpose of this Workshop.

Ocean energy power generation

Ocean Thermal Energy Conversion (OTEC)

Ocean Thermal Energy Conversion technology uses a turbine generator to produce renewable energy from the temperature difference between deep-sea cold water circulating in the ocean and surface seawater warmed by the sun. In order to use the low temperature range, a working media, is used due to its low boiling point. How does this kind of Systems can be in stall on the large mitigation structures with higher efficiency and mass electricity generation.

Wave Power Generation (Air turbine system)

The flow of the air which is produced by the up and down of waves rotate the turbine and generate power. How does this kind of Systems can be in stall on the large mitigation structures with higher efficiency and mass electricity generation.

Ocean Thermal Energy Conversion (OTEC)
Wave Power Generation (Air turbine system)

Energy Dissipation Mechanisms

fig1Dropping pressure through friction loss in pores or small channels. Change of flow direction and wave interaction (overhang shape, rotary vane, etc).

Designed materials such as shape memory alloys, metal forms, super-elastics, etc.

fig2

※2:Photo from "National Research Institute of Fisheries Engineering, Fisheries Research Agency" HP

Structural designs such as fluid flow energy dissipation with turbulence, flow direction change

Possible shapes, as examples

  1. Change flow direction with rotatable turbines or the shape of the structure
  2. Dissipate flow energy with obstacles designed for maximum energy dissipation
  3. Large floating structures to prevent wave motion
  4. Combinations of the above
fig3
International Innovation Workshop on Tsunami, Snow Avalanche and Flash Flood Energy Dissipation 津波・雪崩・洪水ワークショップ 東北大学