• At a location 5 m above the seabed, video footage from a stationary underwater vehicle records a small cloud of suspended sediment moving in an orbital motion due to the passage of a unidirectional wave. The orbital motion is such that the cloud of sediment moves over a total horizontal distance of 1.5 m and a total vertical distance of 0.7 m. The period of the movement is 7.1 seconds. 
• 
  
• (a) Determine the wave length, water depth and wave height based on the video footage. List any assumptions that you have made. 
• (b) Explain how you might determine the direction of the wave propagation from the video footage.