CIV E 530- OPEN CHANNEL HYDRAULICS
SPRING 2004
FIRST MIDTERM
FEBRUARY 23, 2004, 1600-1715

Name: ______________________ S.S. No. _____________ Grade: _______

Instructions: Closed book, closed notes. Use engineering paper. When you are finished, staple your work in sequence (1 to 3), and return this sheet with your work.
  1. (30%) Using the specific energy principle, calculate the discharge (in m2s-1) through a sluice gate in a wide rectangular channel, with upstream depth y1 = 0.4 m, and y2 = 0.1 m.  

     

     

     

     

  2. (30%) An obstruction at the bottom of a wide rectangular channel extends through its width and causes the downstream flow depth to be 85 percent of the upstream flow depth. The steady flow is 1 m2s-1 and the upstream flow velocity is 1.5 m s-1. Calculate the force in kN m-1 exerted by the obstruction on the flow.

     

     

     

     

     

  3. (40%) Please answer the following questions in a brief statement.

    • What is the Froude number?
    • What is the Vedernikov number?
    • What is a rating in open-channel hydraulics?
    • What are the four forces present in open-channel hydraulics?
    • What is the minimum value of Manning's n that can be achieved in practice?
    • Why is unsteady uniform flow impossible in nature?
    • What is the exponent of the rating for turbulent Manning flow in hydraulically wide channels?
    • What is the main difference between a kinematic shock and a tidal bore?