Question

Which one of the following factors governs the inclination of the slip face (leeward side) of ripples?

• A. Velocity of the transporting medium
• B. Sediment supply
• C. Internal friction angle
• D. Drag force

Hint:

The internal friction angle of sediment controls the angle of repose on the slip face of ripples. A higher friction angle results in a steeper slip face.

Answer 1

The Correct Option is C

Step 1: Understanding the formation of ripples.
Ripples are formed by the movement of fluid (wind or water) over loose sediments, creating a series of undulations. The inclination of the slip face (the leeward side) of the ripple is influenced by the friction between the grains on the surface of the sediment.

Step 2: Evaluating the options.
Option (A) is incorrect because while the velocity of the transporting medium influences ripple formation, it does not directly control the inclination of the slip face.
Option (B) is incorrect because sediment supply influences ripple height but does not control the slip face inclination.
Option (C) is correct as the internal friction angle of the sediment governs the angle at which the slip face of the ripple forms. Higher friction results in steeper slip faces.
Option (D) is incorrect because drag force is more important for sediment transport but does not directly control the inclination of the slip face.