Question

video lab: wave tank demonstration https://www.youtube.com/watch?v=3yliqy4h2z-o
background: waves and tides can create the potential for coastal erosion and flood risk. environmental engineers work to help mitigate the issues facing coastal communities caused by waves and tide. as you watch the wave tank simulate waves, record the total amount of overtopping (water) that creates flood risk.

1. which technique was the most effective at reducing overtopping and mitigating flood risk? why?

Explanation:

Step1: Compare the overtopping values

We look at the "Overtopping (mL)" column for all techniques. The lower the value, the less overtopping (water) and thus the more effective in reducing flood - risk.

Step2: Identify the minimum value

Among the values \(50\), \(70\), \(185\), \(125\), \(0\), \(100\), \(5\), \(0\), the minimum values are \(0\) mL.

Step3: Check the corresponding techniques

The techniques with \(0\) mL of overtopping are "Recurved wall with sloped revetment" and "Submerged near - shore breakwater". These techniques likely disrupt the wave energy in a way that prevents water from overtopping. For example, the recurved wall may redirect wave energy upwards and then back, while the submerged breakwater can break the wave before it reaches the coastal area, reducing its force and volume.

Answer:

The "Recurved wall with sloped revetment" and "Submerged near - shore breakwater" techniques are the most effective. They have \(0\) mL of overtopping. The recurved wall redirects wave energy, and the submerged breakwater breaks waves early, reducing wave force and volume that could cause overtopping.