80 Computational Modelling in Hydraulic and Coastal Engineering
3. Due to small bed slopes, the hydrostatic pressure is approximated by
considering the vertical depth (y), instead of the depth perpendicular
to the bed (h p ) (Figure 5.1).
4. The approximation of nearly horizontal flow and that of hydrostatic
pressure distribution is valid.
(a)
(b)
h p y
h p
h p
(c)
Figure 5.1 (a) Water pressure over linear slope bed. (b) Water pressure over convexshaped bed. (c) Water pressure over concave-shaped bed.