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Published byLillian Fitzpatrick Modified over 3 years ago

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**OPEN-CHANNEL FLOW Introduction Ch-10 of HH**

Application Characteristics Section Parameters Flow State Types of Flow Neary/S04

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Application

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**Pressure vs. Open-channel flow**

? free-water surface pressure flow (pressure driven) open-channel flow (typ. gravity driven)

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Section Parameters Reach Length =L [L]= arbitrary horizontal distance between two cross-sections Bed slope = So [L/L] = -dz/dx = -(z2-z1)/L = tanq Flow depth =y [L] = vertical distance from channel bottom to free water surface Depth of flow sec =d [L] = flow depth normal to flow, d=ycosq Top width = T[L] = Width at free-surface Flow area = A[L2] = cross-sectional area normal to flow direction Wetted perimeter = P[L] = length of channel boundary in contact with water Hydraulic radius = R[L] = A/P Hydraulic depth = D[L] = A/T Section Factor Critical Flow = Zc =AD1/2 [L5/2] Section Factor Uniform Flow = Zn = AR2/3 [L8/3]

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**Parameters: Circular Section**

do y

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**Flow State Reynolds Number Froude Number Laminar flow Turbulent flow**

Subcritical flow Supercritical flow Critical flow

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**Types of Flow Variation in Time? Variation in Space?**

Steady flow velocity and depth change with time Unsteady flow velocity and depth change with time Variation in Space? Uniform flow velocity and depth same at every cross-section Nonuniform flow velocity and depth vary between cross-sections

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