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OPEN-CHANNEL FLOW Introduction Ch-10 of HH. Application Characteristics Section Parameters Flow State Types of Flow. Neary/S04. Application. Pressure vs. Open-channel flow. ?. free-water surface. pressure flow (pressure driven). open-channel flow (typ. gravity driven).

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open channel flow introduction ch 10 of hh
OPEN-CHANNEL FLOWIntroduction Ch-10 of HH
  • Application
  • Characteristics
  • Section Parameters
  • Flow State
  • Types of Flow

Neary/S04

pressure vs open channel flow
Pressure vs. Open-channel flow

?

free-water surface

pressure flow

(pressure driven)

open-channel flow

(typ. gravity driven)

section parameters
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]
flow state
Flow State
  • Reynolds Number
    • Laminar flow
    • Turbulent flow
  • Froude Number
    • Subcritical flow
    • Supercritical flow
    • Critical flow
types of flow
Types of Flow

Variation in Time?

  • 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