非均匀流动中的波能耗散

DISSIPATION OF WAVE ENERGY ON NON-UNIFORM CURRENT

本文对波浪在非均匀流动中传播时的波能耗散或波高衰减进行了研究.直接从N—S方程出发,引入相应的紊流模式,同时考虑床面和内部摩阻耗散,从理论求得了衰减率.该理论模式还可以同时求得色散关系、流速分布等.衰减率的理论结果与Iwasaki,T ＆ Sato,M.,以及Simons,R.R.等人的实验结果吻合较好.此外,本文还对衰减率的影响因素进行了全面的分析.

Energy dissipation or wave height attenuation is analysed theoretically for water waves propagating on a non-uniform current. The wave equations and current equations in combined flow are derived from N-S equations, and an eddy viscosity turbulent model is introduced in consideration of bottom and inernal friction. Through this model the wave energy dissipation, dispersion relation and velocity distribution instide and outside wave boundary layer can be calculated. Theoretical results of wave height attenuation are in good agreement with the experimental results from Sato, T. Iwasaki & T. Sato, R. R. Simons et al. The factors which influence the wave energy dissipation are also discussed comprehensively.