by Dept. of Defense, Dept. of the Army, Corps of Engineers], Coastal Engineering Research Center in [Washington .
Written in English
|Statement||Richard O. Bruno, George M. Watts, Christopher G. Gable.|
|Series||Reprint - Coastal Engineering Research Center ; 78-8|
|Contributions||Watts, George M., Gable, Christopher G., Coastal Engineering Research Center (U.S.).|
|The Physical Object|
|Pagination|| p. :|
|Number of Pages||20|
In , a detached offshore breakwater was built ft off the coast of Santa Barbara, California, to provide protection for a harbor. Within 1 year, a large amount of sand accumulated behind the structure, threatening to shoal the deep-water end of the harbor. The function of offshore detached breakwater of controlling longshore current and resulting sediment transport under oblique wave incidence is examined mainly through experiments. Although the offshore detached breakwater can effectively reduce incident wave energy, it has little influence on longshore current. contents groins design andeffects equilibrium shores andcoastal design byt. l. walton, jr 1 the effects of groins onbeach erosion and channel stabilityatthelimfjord barriers, denmark by s. c. mikkelsen 17 beachformchanges in thelee ofgroins atsandy hook, newjersey by james r. allen andkail f. nordstiom 33 dredging at inlets a comparativereview of sand transfer systems at . Offshore breakwaters are one of these structures. Construction of offshore breakwaters is one of the main countermeasures against beach erosion. In this paper, offshore protection process is studied on the effect of offshore breakwater parameters (length, distance and gap), wave parameters (height, period and angle) and on sediment accumulation ratio, one .
Although the trap area is sheltered by the offshore breakwater, the tex- tural patterns of sediments within it are similar to those characterizing an open coastline. The sand is coarsest and most poorly sorted in the nearshore zone. OCE Marine Structure Designs Lecture #20 (Offshore Breakwater Planning Analysis). Facts about Offshore Breakwaters designed to provide protection from wave action to an area or shoreline located on the leeward side of the structure usually oriented approximately parallel to shore to provide protection for harbors or erodible shorelines, and/or to serve as a littoral barrier sediment . Technical Report CERC December im AD-A US Army Corps AD-A of Engineers l1i1 l 0 Waterways Experiment Station Engineering Design Guidance for Detached Breakwaters as. 13 Bad Practice in Erosion Management: The Southern Sicily Case Study in the lee of offshore w estern breakw aters produc ed an important surp lus of sediments .
Abstract. Breakwater layout directly affect the magnitude and distribution of sedimentation at coastal harbors and other infrastructures. Though previous studies explored the mechanism of rapid sedimentations with various mitigation engineering measures proposed there has been no widely-accepted principle guiding the optimum design of breakwater : Yuhai Wang, Liqun Tang, Jinrong Chen. Orientation of breakwaters and the gaps between them alter waves entering gaps. • Waves approaching normal to the gap can undergo less attenuation than other waves. • Greater wave energy on the gap-facing side of a salient creates shoreline asymmetry. • Breakwater orientations can be altered to selectively dampen or facilitate wave by: 3. This breakwater serves a dual function of sheltering the harbor entrance and acting as a littoral sand trap. Three cycles of biennial littoral sand bypassing havebeen successfully completed resulting in supply of 11,, cubic yards of sand to the eroding shoreline at an average annual cost of $ per cubic yard, including annual maintenance . Sediment transport driven by current, wind and wave plays an important role in influencing the evolution of offshore and onshore bed morphologies by deposition and erosion. Correspondingly, the offshore and onshore industrial devices may be seriously damaged in some extremely cases like typhoons, hurricanes and so on.