CIV E 638 - SEDIMENTATION AND RIVER ENGINEERING
FALL 2020
HOMEWORK No. 1:  RIVER MECHANICS

  1. Sketch the one-dimensional vertical velocity distribution featured in THE SAME QUESTION and describe in detail its geometric and hydraulic properties.

  2. Given particle diameter d = 0.1 mm, and water temperature T = 20oC, calculate the fall velocity of a spherical sediment particle using ONLINE_FALL_VELOCITY.

  3. Determine whether a 3-mm diameter quartz particle is at rest or moving under the action of a 7-ft flow depth with channel slope So = 0.0001. Assume water temperature T = 70oF. Use ONLINE_SHIELDS. What flow depth (to an accuracy of hundredths of feet) will initiate movement?

  4. What is the minimum Froude number and minimum permissible velocity required to move a particle of diameter ds = 0.5 mm with a flow depth d = 0.8 m and dimensionless Chezy friction factor f = 0.004? Assume water temperature T = 20oC. Use ONLINE_SHIELDS_VELOCITY.

  5. Estimate the particle size (in mm) that will initiate movement for the Canal do Trabalhador. Assume y = 2.5 m, and T = 25°C.