Chapt10

# 39 this equation has one negative and two positive

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: oint 2 will lie on the same leg of the curve as E1. A subSupercritical approach flow Subcritical approach y1 y2 V1 V2 ∆h Bump (a) Water depth v v | | ∆h Supercritical bump Ec (b) e-Text Main Menu Subcritical bump 2 y2 yc Fig. 10.9 Frictionless two-dimensional flow over a bump: (a) definition sketch showing Froude-number dependence; (b) specific-energy plot showing bump size and water depths. 1 ∆ h max y1 E2 E1 2.0 Specific energy | Textbook Table of Contents | Study Guide Chapter 10 Open-Channel Flow critical approach, Fr1 1, will cause the water level to decrease at the bump. Supercritical approach flow, Fr1 1, causes a water-level increase over the bump. If the bump height reaches hmax E1 Ec, as illustrated in Fig. 10.9b, the flow at the crest will be exactly critical (Fr 1). If h hmax, there are no physically correct solutions to Eq. (10.39). That is, a bump too large will “choke” the channel and cause frictional effects, typically a hydraulic jump (Sec. 10.5). These bump arguments are reversed if the channel has...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online