Workshops Theme 2
Group C
Japan(Niigata) Shibata High School
School Introduction Video
Presentation Summary
| Title | Strip Walls as a Method of Tsunami Defense | |
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| Survey | Introduction | The main objective of this study is to decrease the damage of riverine tsunami. In 2011, the Great East Japan Earthquake occurred and tsunamis traveling up rivers caused serious damage inland because Japan is an island nation. Therefore, we want to develop the best method to reduce wave heights and make use of it in our daily life. In the experiment, a device was used to generate waves that resembled a tsunami (Figure 1). |
| Method | In the tsunami generation part of the device used(Figure 2), the elastic force of rubber bands caused the plate to bounce up, thereby generating a tsunami. The wave height was measured at the measurement part, 2 meters away from the tsunami generating point. Wooden strip walls were prepared (Figure 3), and experiments were conducted by changing the number of the strip walls and their distance from the measurement part. Experiment 1 Experiment with 0-7 strip walls of 3cm width equally spaced. (Distance from the measurement point: 50cm) Experiment 2 The number of strip walls was five. The wave height was measured while changing the strip walls’ position. （Distance from the measurement point：26㎝ 35㎝ 44㎝ 53㎝ 62㎝ 71㎝ 80㎝） Experiment 3 The number of strip walls was four. The wave height was measured while changing the strip walls’ position. （Distance from the measurement point：26㎝ 35㎝ 44㎝ 53㎝ 62㎝ 71㎝ 80㎝） |
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| Subject | ||
| Results | Experiment-1 The height of the wave increased when the number of strips used was 1 and 5. It decreased for all other number of strips. Experiment-2 The average reduction of wave height was the greatest when the five strip walls were 62 cm from the measurement part. Experiment-3 The average reduction of wave height was the greatest when the four strip walls were 80 cm from the measurement part. |
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| Issues | 1. The height of waves is difficult to measure accurately. 2. In Experiment 1, the wave height when there were five strip walls was higher than that with no strip walls. |
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| Action Plan | 1. We will find a more accurate way to measure wave height. 2. We will try an experiment that places the strip walls closer to and further from the tsunami generation point. 3. We will clarify the relationship between how waves interfere with each other due to changing the number of strip walls and their distance from the tsunami generation point. |
