Managing Tidal Inlets

Updata:01-01-1970

Source:
By:Jonathan Akin Frencb

DOI: https://doi.org/10.30564/jms.v1i2.850

Abstract:

Sandy inlets are in a dynamic equilibrium between wave-driven littoral drift acting to close them, and tidal flows keeping them open. Their beds are in a continual state of suspension and deposition, so their bathymetry and even location are always in flux. Even so, a nearly linear relationship between an inlet’s cross-sectional flow area and the inshore tidal prism is maintained - except when major wind and/or runoff events act to close or widen an inlet. Inlet location can be stabilized by jetties, but dredging may still be necessary to maintain a navigable channel. Armoring with rock large enough to resist erosion can protect an inlet bed or river mouth from excessive storm flow erosion.  Armoring can also be used as a stratagem to close inlets.

References:

[1]Shore Protection Manual, U.S. Army Corps of Engineers, 1984, 1: 1-14 to 1-15. [2]O’Brien, M.P., “Estuary tidal prisms related to entrance areas,” Civil Engineering, 1931,1(8): 738-39. [3]Bruun, P., and F. Gerritsen, “Stability of Coastal Inlets,” J.Waterways and Harbors Division, ASCE, 1958, 84(3): 1644. [4]Wiegel, R.A., Oceanographical Engineering [M], Prentice-Hall, 1963: 380. [5]Shields, A., “Anwendung der Ähnlichkeitsmechanik und der Turbulenzforschungs auf die Geschiebebewegung,” Mitteilung der Preuss. Versuchsanst. für Vasserbau und Schiffbau., Berlin, Heft 26, 1936. [6]Rouse, H.W. (ed.), Engineering Hydraulics [M], Wiley, 1950: 790. [7]Shore Protection Manual, U.S. Army Corps of Engineers, 1984, 2: 6-53 to 6-76. [8]Spaulding, M., personal communication, 1982. [9]French, J.A, and B.M. Harley, “Tidal Dam Closure in Singapore,” presented to the Hydraulics Group, Boston Society of Civil Engineers, 1985.

Tags: