This paper presents a design of submerged breakwater, which functions as an eco-structure in marine environment. Newly patented blocks were applied to arm the submerged breakwater for providing inhabitable space of fisheries as well as its stability. To investigate the wave transmission of the proposed submerged breakwater, parametric studies were conducted through two dimensional hydraulic tests, which were carried out at the National Fisheries Research and Development Institute (NFRDI) in South Korea. Those parameters are relative crest width (B/L), wave steepness (H/L), relative crest depth (hB/H), and submerged breakwater configurations. The hydraulic experimental results can be used to predict the performance of the proposed submerged breakwater covered with the multi-functional blocks.
Submerged breakwaters have various advantages including the maintenance of natural sea landscape, prevention of pollution at ports and fishery harbors through improving seawater exchange by flowing water over the crest, and the improvement of marine ecosystem through functioning as fish reefs (Kim, Y.W. et al., 2003). Moreover, there are elementary and deployment technologies for improvement in the environment of fishing grounds and the proliferation of marine biological resources through the control and fostering of ecosystem including bottom-mounted and floating fish reefs, seaweed reefs, training levees, artificial upwelling structures and structures for improving bottom materials (Kim, H.J. et al., 1996). In Korea, there has been no case of design and construction of submerged breakwaters that can provide composite functions for wave control and fish reefs, and related research has also been very rare. Accordingly, the present study purposed to analyze the hydraulic characteristics of submerged breakwaters armored with functional blocks, which can maintain composite functions, instead of TTP that is used widely as armor blocks for submerged breakwaters, by comparing them with those using conventional TTP through two-dimensional hydraulic simulation on the stability and wave control function.