CIV E 638 - SEDIMENTATION ENGINEERING
FALL 2022
HOMEWORK No. 1:  RIVER MECHANICS

  1. Given particle diameter d = 0.15 mm, and water temperature T = 20oC, calculate the fall velocity of a spherical sediment particle using ONLINE_FALL_VELOCITY.

  2. Determine whether a 3-mm diameter quartz particle is at rest or moving under the action of a 8-ft flow depth with channel slope So = 0.0001. Assume water temperature T = 70oF. Use ONLINE_SHIELDS. What flow depth (to an accuracy of 0.01 feet) will stop movement?

  3. What is the minimum Froude number and minimum permissible velocity required to move a particle of diameter ds = 0.6 mm with a flow depth d = 1.2 m and dimensionless Chezy friction factor f = 0.004? Assume water temperature T = 20oC. Use ONLINE_SHIELDS_VELOCITY.

  4. Estimate the particle size (in 0.1 mm) that will initiate movement for the Canal do Trabalhador. Assume y = d = 2.5 m, and T = 23°C.