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.