Experiments on snap force in tethers of submerged floating tunnel model under hydrodynamic loads in case of shallow water

Snap force in tether may cause fracture in the tether system or plate which connecting tether and tunnel body. In this paper, snap force in tether of Submerged Floating Tunnel (SFT) were investigated by hydrodynamic testing on the SFT model. The case study of the shallow waters refers to one of the waterways crossing which connecting the Panggang island and the Karya island in Indonesia is used. Hydrodynamic testing model is carried out by applying regular waves with different variation of wave and structural parameters. Experimental models use PVC cylindrical pipe where the dimension of the model testing use 1:100 scale from the real environmental conditions. In the SFT model testing, the forces on the mooring lines were measured using a PVDF transducer type which is based on the sensor piezoelectric material. Results show that snap force occurs in certain condition of wave and structure parameter.