3 Hydrodynamics
207
Fig. 3.34 Jean Baptiste Charles Joseph BéLanger(1790–1874, French hydraulician)
ds
h+dh
V+dV
z 0 +dz 0
Fig. 3.35 Differential equation of steady gradually varied flow in open channel
rectangular channel, and obtain the differential equation of water depth
change from the energy equation and continuous equation
ids = dh cos θ + d
V 2
2g
+
V 2
C 2 R
ds