Tidal Siphon: Alternative to a Jetty-Hardened Inlet
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 133, Issue 3
Abstract
This paper reviews the feasibility in function and design of an alternative to the jetty-hardened coastal inlet to develop tidal exchange between the ocean and an estuary. The proposed alternative is a subseabed (buried) tidal siphon. The proposed siphon will be best suited for inlets where navigation is not required and a tidal lag can be tolerated. The four main objectives of this paper are: (1) to present the immediate reasons for coastal inlet closures; (2) to identify the tidal exchange best suited for the tidal siphon; (3) to determine the shallowest functional depth of the inlet/outfall; and (4) to evaluate the hydraulic performance of the designed tidal siphon. It was determined the best tidal exchange for the tidal siphon is in the lower one-third of the stable tidal prism, the stability prism, and the reasonable depth for the offshore inlet/outfall structure is the depth of closure. Based on an analytical evaluation, the tidal siphon as designed preformed as required. Collection of field data included offshore wave height and length, turbidity as a function of elevation from the oceanbed, tidal range in the lagoon and tidal lag as a function of offshore tide, and inlet velocity as a function of tidal phase. The estuary used in this study is a recently constructed tidal inlet at the Batiquitos Lagoon in Carlsbad, Calif.
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Acknowledgments
The writers would like to thank Dr. Malcolm Spalding for advice on field data requirements. Also the writers would like to thank Jerry Wilson of Rascal Palagos (Thales) on help with procurement and deployment of field sensors and reduction of raw data, Mike Beaty for his help with data collection and data recording, and Chris Whalen for help writing the code for the response program.
References
American Concrete Pipe Association. (1997). “Concrete pipe insights.” http://www.concrete-pipe.org/tech.html (Aug. 17, 1999).
Appy, R. G. (1991). “Enhancement of subtidal and intertidal estuarine habitats in Southern California.” Proc., Japan–United States Symp. on Artificial Habitats for Fisheries, Port of Los Angeles, Los Angeles, 259–268.
Boothroyd, J. C. (1985). “Tidal inlets and tidal deltas.” Coastal sedimentary environments, 2nd. Ed., Springer, New York, 445–532.
Boothroyd, J. C., Friedrich, N. E., and McGinn, S. R. (1985). “The geology of microtidal coastal lagoons.” Marine Geology, 63, 35–76.
Bruun, P. (1978). Stability of tidal inlets: Theory and engineering, Elsevier, New York, Amsterdam.
CH2M Hill. (1989). “Batiquitos Lagoon enhancement project draft environmental impact statement/environmental impact report.”
City of Carlsbad. (1990). “Batiquitos Lagoon enhancement project final environmental impact report/environmental impact statement.” California and U.S. Army Corps of Engineers, Los Angeles.
DeGennaro, N. (2000). “The engineering feasibility of a tidal siphon: An alternative to the jetty hardened coastal inlet.” Ph.D. thesis, Univ. of Rhode Island, Kingston, R.I.
DeGennaro, N., and Wilson, J. (1997). “Batiquitos tidal inlet study.” Rep. Submitted to the Port of Los Angles, Los Angeles.
Dombrowski, M. R., and Mehta, A. J. (1997). “Ebb tidal delta evolution of coastal inlets.” Proc., 25th Int. Conf. on Coastal Engineering, Coastal Engineering Research Council of ASCE, New York, 3270–3283.
Escoffier, F. F. (1940). “The stability of tidal inlets.” Shore Beach, 8(4), 114–115.
Escoffier, F. F. (1977). “Hydraulics and stability of tidal inlets.” GITI Rep. No. 13, U.S. Army Corps of Engineering Research Center, Vickesburg, Miss.
Fitzgerald, D. M. (1996). “Geomorphic variability and morphologic and sedimentologic controls on tidal inlets.” J. Coastal Res., 23, 47–71.
French R., H. (1985). Open-channel hydraulics, McGraw-Hill, New York.
Hallermeier, R. J. (1983). “Sand transport limits in coastal structure design.” Proc., Coastal Structures, 703–716.
Ippen, A. T. (1966). Estuary and coastline hydrodynamics, McGraw-Hill, New York.
Jarrett, J. T. (1976). “Tidal prism—Inlet area relationships.” GITI Rep. No. 3, U.S. Army Corps of Engineering Research Center, Vicksburg, Miss.
Johnson, J. W. (1973). “Characteristics and behavior of Pacific coast tidal inlets.” J. Wtrwy., Harb. and Coast. Engrg. Div., 99(3), 325–339.
Keulegan, G. H. (1967). “Tidal flow in entrances—Water level fluctuations of basins in communication with seas.” Technical Bulletin No. 14, U.S. Army Corps of Engineering Research Center, Vicksburg, Miss.
Lindeburg, M. R. (1997). Civil engineering reference manual for the PE exam, 6th Ed., Professional Publications, Inc., Belmont, Calif.
Madison Chemical Industries, Inc. (1996). CorroNews, Thomas and Betts—Special Ed., Summer.
Noda, E. K. (1994). “Nearshore circulation under sea breeze conditions and wave current interactions in the surf zone.” Tetra Tech Rep. TC 149-4, Tetra Tech, Inc., Los Angeles.
O’Brien, M. P. (1931). “Tidal prisms related to entrance areas.” Civ. Eng. (N.Y.), 1(8), 738–739.
O’Brien, M. P. (1967). “Dynamics of tidal inlets.” Coastal lagoons: A symposium, 397–406.
O’Brien, M. P., and Clark, R. R. (1974). “Hydraulic constants of tidal entrances.” Proc., 14th Coastal Engineering Conf., 1546–1565.
O’Brien, M. P., and Dean, R. G. (1972). “Hydraulics and sedimentary stability of coastal inlets.” Proc., 13th Coastal Engineering Conf., 761–780.
Seabergh, W. C., Cialone, M. A., and Stauble, D. K. (1997). “Impacts of inlet structures on channel location.” Proc., 25th Int. Conf. on Coastal Engineering (1996), Coastal Engineering Research Council of ASCE, New York, 4531–4544.
Sunamura, T., and Takeda, I. (1993). “Bar movement and shoreline change: Predictive relations.” J. Coastal Res., 15, 125–140.
Tekmarine, Inc. (1987). “Oceanside littoral cell preliminary sediment budget report.” Coast of California Storm and Tidal Waves Study CCSTWS 87-4, Tekmarine, Inc.
Tekmarine, Inc. (1989). “Semi-annual beach profile surveys and analysis.”
U.S. Army Corps of Engineers (USACE). (1971). Flood plain information, San Marcos.
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© 2007 ASCE.
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Received: Nov 4, 2004
Accepted: Apr 3, 2006
Published online: May 1, 2007
Published in print: May 2007
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