CIV E 638-SEDIMENTATION AND RIVER ENGINEERING
FALL 2012
MIDTERM EXAM, MONDAY, OCTOBER 15, 2012

Name: ___________________ Red ID: _________________ Grade: _______

Instructions: Closed book, closed notes. Answer only ten (10) questions. Use engineering paper. When you are finished, staple your work in sequence, and return this sheet with your work.

Answer only ten (10) questions.

  1. What does the Shields curve express? What are the parameters (x and y)? What is the accepted threshold value of the Shields parameter for initiation of motion?

  2. What is the value of Froude number that guarantees initiation of motion under most conditions of practical interest?

  3. List the various friction factors used in sedimentation and river engineering (5).

  4. What is Jarrett's contribution to river mechanics?

  5. How does Nature minimize the changes in stage with changes in discharge? Explain.

  6. What is the difference between sediment production, sediment yield, sediment transport, and sediment routing?

  7. What are the modes or types of sediment transport in natural and artificial channels?

  8. What is Einstein's conttibution to sedimentation engineering?

  9. What is Colby's contribution to sedimentation engineering?

  10. What is the range of variation of the exponent of the unit-width solid discharge/mean velocity relation? Explain how this exponent is affected by the bed configuration.

  11. When is sediment routing applicable? What are the limitations of sediment routing?
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