EM 1110-2-1100 (Part II)
30 Apr 02
Figure II-6-5. Minimum width cross-sectional area of channel Amw versus
channel length Lmw (Vincent and Corson 1980)
b. Inlet currents and tidal elevations.
(1) A simple introduction to inlet hydraulics will consider applying the one-dimensional equation of
motion and the continuity equation. We want to find the maximum inlet current, the tide range of the bay
and the phase lag of the bay tide relative to the tide in the ocean in terms of parameters which can be easily
measured or determined, including inlet cross-sectional area, bay surface area, ocean tide amplitude and
period, length of channel, and head loss coefficients. The simplified inlet system is shown in Figure II-6-15.
Keulegan's assumptions (1967) were as follows:
(a) Walls of the bay are vertical.
(b) There is no inflow from streams.
(c) No density currents are present.
(d) Tidal fluctuations are sinusoidal.
(e) Bay water level rises uniformly.
Hydrodynamics of Tidal Inlets
II-6-7
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