Runup of solitary waves on a straight and a composite beach |
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| Institution: | 1. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha, Hunan 410114, China;2. Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093, USA;3. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha, Hunan 410114, China;1. Zienkiewicz Centre for Computational Engineering, College of Engineering, Swansea University, Swansea SA1 8EN, United Kingdom;2. Department of Civil and Structural Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom;3. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China;4. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China;5. Institute of Estuarine and Coastal Research, School of Marine Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, China;1. Department of Ocean Engineering, IIT Madras, India;2. Marine Systems Institute, Tallinn University of Technology, Akadeemia tee 15A, 12618 Tallinn, Estonia;3. Nizhny Novgorod State Technical University n.a. R.E. Alekseev, Minin str. 24, 603950 Nizhny Novgorod, Russia;4. Institute of Applied Physics, Ulyanov str. 46, 603950 Nizhny Novgorod, Russia;5. Forschungszentrum Küste (FZK), Merkurstraße 11, 30419 Hannover, Germany |
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| Abstract: | Particle Image Velocimetry (PIV) and wave gauges have been used to investigate the runup of solitary waves at two different beaches. The first beach is straight with an inclination of 10°, whereas the second is a composite beach with a change in the 10° inclination to 4° at a vertex point above the equilibrium water level. Comparison with numerical simulations using a Navier–Stokes solver with zero viscosity has been performed for the composite beach. Four different amplitudes of incoming solitary waves are investigated.Measurements of the runup show that the composite beach gives a lower runup compared to the straight beach. Furthermore, the composite beach experiences a longer duration of the rundown compared to the straight beach. This is at least partially assumed to be a result of scaling effects, since the fluid above the vertex creates a relatively thinner runup tongue compared to the straight beach scenario.The appearance of a stagnation point at the beach boundary is clearly visible in both the PIV results and the numerical simulation. This stagnation point is originating at the lowermost part of the beach, and is moving upwards with time. It is found that the stagnation point moves faster upwards for the straight beach than for the composite beach. Further, the stagnation point is moving even faster in the numerical simulation, suggesting that the velocity with which the stagnation point moves is influenced by viscous scaling effects.Finally, the numerical simulation seems to capture the physics of the flow well, despite differences in the phase compared to the PIV results. This applies to both the flow field and the surface elevations. |
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