ESTIMATION OF TSUNAMI WAVE IMPACT PRESSURE ON RIVER STRUCTURES BY AN IMPROVED PARTICLE METHOD

Abstract

 This paper presents a method for estimating wave pressure on river management facilities at tsunami run-up area. The tsunami generated by the 2011 Tohoku Pacific-Coast Earthquake intruded ten Class-1 Rivers in Hokkaido, Japan. Videotaped imagery showed the tsunami which propagated into Shin-Kushiro River struck a sluice gate with wave breaking. The main aim of this paper is to develop a 2D particle based simulation model for analysis of interaction between river-tsunami and river management facilities such as sluice gates. The numerical method we use is based on the 2D Moving Particle Semi-implicit (MPS) method, which has been proposed for calculation of incompressible fluid flows. Validation of the code by some numerical tests, namely, hydrostatic pressure, impacts by a dam break flow and a violent sloshing flow are carried out to demonstrate the applicability of the particle method for impact pressure estimation. Then the method is applied to the simulation of tsunami wave intrusion into a sluice gate to investigate the wave characteristics and to estimate maximum impact pressures on it.