CIV E 632-COMPUTATIONAL HYDRAULICS AND HYDROLOGY
SPRING 2004
MIDTERM EXAM
MARCH 3, 2004, 1900-2015
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. Answer only 10 questions.
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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
waves?
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Describe the importance of the reference channel length Lo,
i.e., the distance measured along the channel in which the
river elevation falls by an amount equal to its depth.
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What is the main message of Cunge's paper on 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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Describe the physical and numerical conditions under which the
Muskingum-Cunge method is applicable and accurate.
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Why is the looped-rating Muskingum-Cunge routing better than the weighted four-point implicit
scheme of Preismann used in dynamic wave models? What definition of Courant number would you use
in flood routing computations?
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Under what conditions would flood wave steepen? Under what conditions would they attenuate?
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How does cross-sectional shape determine hydrodynamic stability?
Explain. What is the Froude number for neutral stability of an inherently stable channel?
- Why is dam-breach propagation likely to result in the same flood discharge at a certain distance downstream, regardless of the breach discharge?
What physical parameter determines whether this distance is short or long?
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Under what
four physical conditions is the kinematic shock more likely to
develop?
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In surface water modeling,
why is it better to neglect both inertia terms instead of just one?
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