Change in shape of a linear hydrobiotechnical structure (HBTS) under influence of the sea waves

Abstract

In the rough sea, the ridge of linear hydrobiotechnical structure (HBTS) presumably takes a shape of catenary line under the buoys lifting force evenly distributed along its length, with the maximum deflection equal to the wave height. Using the catenary line equation, length of the chord is calculated for typical cases of the sea roughness of 4, 5 and 6 points (wave height of 2.0 m, 3.5 and 6.0 m, respectively) and shifts of the end buoys, angles of inclination and tensions of the anchor guy are determined for these cases that allows to estimate magnitude of the anchor shear force, at which the anchor begins to slide. On the basis of these estimations, a mushroom-shaped anchor is recommended to use, which holding force exceeds the shear force.

Keywords

• linear hydrobiotechnical structure (hbts)
• hbts ridge
• buoy lifting
• sea roughness
• wave height
• catenary line
• tension force
• tension of anchor guy
• anchor holding force
• anchor shear force