The more amplitude the larger the wave is, and the higher it is from the ground. The more frequency the wave has, the more waves are produced, and the faster they are.
When a barrier is added the waves bounce back, and interfere with the coming waves, creating a less constant movement in the water. This also creates ripples and waves going opposite directions in the tub. On the other side of the barrier only the small waves that pass through enter, making very small ripples and small waves.
Depending on where you locate your barrier the waves are going to interfere with each other, creating ripples. Above the barrier is located almost at the source of the waves (the tap), and observing it it looks almost as if it doesn't do anything, and as if the waves just pass through.http://phet.colorado.edu/en/simulation/wave-interference
The simulator was really fun to use wasn't it? I like the images you put in the blog post. They depict exactly what happens when waves diffract. Good job.
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