chapter 3 hydraulics of open channel flow
chapter 3 hydraulics of open channel flow
chapter 3 hydraulics of open channel flow
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TABLE 3.5 Classifications <strong>of</strong> Gradually Varied Flow Pr<strong>of</strong>iles<br />
3.20<br />
Pr<strong>of</strong>ile Designation<br />
Channel Zone Zone Zone Relation <strong>of</strong> y Type Type<br />
Slope 1 2 3 to yN and <strong>of</strong> <strong>of</strong><br />
yc Curve Flow<br />
(1) (2) (3) (4) (5) (6) (7)<br />
HYDRAULICS OF OPEN CHANNEL FLOW<br />
Mild M1 y � yN � yc Backwater Subcritical<br />
0 � So � Sc (dy/dx � 0)<br />
M2 yN � y � yc Drawdown Subcritical<br />
(dy/dx < 0)<br />
M3 yN � yc � y Backwater Supercritical<br />
(dy/dx � 0)<br />
Critical C1 y � yc � yN Backwater Subcritical<br />
So � Sc � 0 (dy/dx � 0)<br />
C2 y � yN � yc Parallel to Uniform<br />
<strong>channel</strong> bottom critical<br />
(dy/dx � 0)<br />
C3 yc � yN � y Backwater Supercritical<br />
(dy/dx � 0)<br />
Steep S1 y � yc � yN Backwater Subcritical<br />
So � Sc � 0 (dy/dx � 0)<br />
S2 yc � y � yN Drawdown Supercritical<br />
(dy/dx � 0)<br />
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