CIV E 632-COMPUTATIONAL HYDRAULICS AND HYDROLOGY
SPRING 2007
MIDTERM EXAM
MARCH 14, 2007, 1600-1715
Name: ______________________ S.S. No. ________________ Grade: _______
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Instructions: Closed book, closed notes. Use engineering paper.
When you are finished, staple your work in sequence,
and return this sheet with your work.
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Compare the celerity and attenuation properties of
kinematic, diffusion, dynamic, and inertial (gravity)
waves. Do dynamic waves exist in the real world? Do kinematic waves exist in the real world?
Explain.
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What do overland flow and slow-rising flood waves have in common
that they lend themselves to description by kinematic and diffusion
wave models?
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Describe the importance of the reference channel length Lo
[the distance along the channel in which the
water-surface elevation falls by an amount equal to its depth] in unsteady flow in open channels.
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What is the main message of Cunge's paper on the Muskingum method?
- According to Cunge, what is the value of Courant number to assure accuracy in the Muskingum method?
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How does the variable-parameter Muskingum-Cunge method differ
from its constant-parameter counterpart?
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What definition of Courant number would you use
in flood routing computations?
- What is grid independence in the context of numerical modeling?
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What is the Froude number for neutral stability of an inherently stable channel?
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Under what
four physical conditions is the kinematic shock more likely to
develop?
- Extra credit (10 points): Which one of the three waves studied (kinematic, diffusion, and dynamic), is most applicable to flood propagation
situations. Why?
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