Chapt10

Before proceeding we remark as usual that whole books

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Unformatted text preview: proceeding, we remark, as usual, that whole books have been written on open-channel hydraulics [1 to 4]. There are also specialized texts devoted to wave motion [5 to 7] and to engineering aspects of coastal free-surface flows [8, 9]. This chapter is only an introduction to broader and more detailed treatments. 1 Surface tension is rarely important because open channels are normally quite large and have a very large Weber number. | v v 659 | e-Text Main Menu | Textbook Table of Contents | Study Guide 660 Chapter 10 Open-Channel Flow An open channel always has two sides and a bottom, where the flow satisfies the noslip condition. Therefore even a straight channel has a three-dimensional velocity distribution. Some measurements of straight-channel velocity contours are shown in Fig. 10.1. The profiles are quite complex, with maximum velocity typically occurring in the midplane about 20 percent below the surface. In very broad shallow channels the maximum velocity is near the surface, and the velocity profile is nearly logarithmic from the bottom to the free surface, as in Eq. (6.84). In noncircular channels there are also secondar...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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