Nowadays, with respect to the widespread exploitation of beaches, their protection against erosion engendered by the sea waves impact has become an increasingly essential coastal engineering concern. Breakwaters and sea-walls are common coastal engineering structures to protect the coastlines. Among these, flexible mound breakwaters are concerned as the novel and affordable coastal structures. These are geosynthetic cylindrical structures typically performing as tensile shells or membranes. The advantages of submerged flexible mound breakwaters over the existing ones, are not only the economic issues and less execution time, but also the preservation of the coastal landscape due to their submergence, higher wave energy dissipation and high reciprocating movements owing to their flexibility. Moreover, these structures can also be employed on the existing submerged rigid breakwaters to increase their crest height. There are a plenty of ways to increase their efficiency and reduce their design and implementation costs dramatically. Therefore, in the present study we investigated the performance of submerged flexible mound breakwaters near the shore, associated with a submerged obstacle, placed right before the structure at the sea-side. This combination favorably performs well in case of waves hydraulic reactions due to the presence of the structure in the wave path and finally increases the waves energy dissipation. Consequent to the use of collected data and scrutinizing the recorded experimental images and clips, the results are analyzed considering the effects of geometric and hydraulic parameters of the models and radiated waves on the reflection, transmission and energy dissipation coefficients of the waves, based on model experimentation. According to the range of the radiated waves height and the geometric conditions of this combination and interference of radiated and reflected waves, the influence of different effective geometric parameters is examined and the flow mechanisms are analyzed, approaching and passing the above mentioned structures. As an outstanding result of the present study, we noticed that the wave transmission and reflection coefficients are decreased and the energy dissipation coefficient is increased significantly, through the use of a submerged flexible mound breakwater combined with a submerged rigid obstacle at the sea-side. Key words : Submerged rubber breakwater, reflection, transmission and dissipation coefficients, wave steepness, shore protection, hydraulic reactions of sea waves