Evaluating the effectiveness of tidal wave barriers
The materials required for this science project are as follows:
- a water tank of dimensions 2 meters x 1 meter x 0.3 meter
- a sand bag that weighs 3 kg
- a piece of plywood of dimension 0.6 meter x 1 meter
- a piece of plywood of dimension 1 meter x 1 meter
- a piece of plywood of dimension 1 meter x 2 mater
- enough water to fill the tank
- a box of clay or play dough
- 10 bricks
- a protractor and a ruler
1. For this science fair project, the independent variable is the type of barrier used (a man made barrier and an artificial mangrove swamp). The dependent variable is how far the wave travels on shore. The distance that the water travels should be measured using a ruler. The constants (control variables) are the size of the water tank, the size of the sand bag, the weight of the sand bag, the slope of the shore line and the slope of the drop ramp.
2. The tsunami simulator is set up as in figure 1. The 0.6 meter x 1 meter piece of plywood is used as the land gradient. It is tilted at 30° and fixed in place using the clay. The 1 meter x 1 meter piece of plywood is the drop ramp from which the sand bag falls. It is fixed using clay at the other end to the tank. It is tilted at 60 °.
3. The 2 meter x 1 meter piece of plywood represents the shore and inland area. The piece of plywood is supported by the water tank on one side, and by bricks on the other end.
4. The tank is filled with water until it almost overflows. The sand bag weighing 3 kilograms is dropped from the ramp. "Tidal waves" will be created. Use the ruler to measure how far the water reaches inland. The test is repeated 3 times and the distance measured is recorded in the table below.
5. The 2 meter x 1 meter piece of plywood is fixed with a man made barrier measuring 10mm tall, 5mm width and 1 meter long. The plywood is placed on the tsunami simulator and the test described in procedure 3 is repeated. The distance measured is recorded in the table below.
6. The man made barrier is removed and the plywood is fixed with some artificial plastic grass. The plywood is placed on the tsunami simulator and the test described in procedure 3 is repeated. The distance measured is recorded in the table below.
Basic safety requirements