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A simple method is proposed to calculate an instantaneous bottom shear stress under waves and current crossing at an arbitrary angle, on the basis of the theoretical study of Tanaka and Shuto (1981). Although the exact solution derived Tanaka and Shuto is expressed in terms of the complex-valued Bessel functions, the approximate solution presented in this study is very simple with reasonable accuracy. This method can, therefore, be extensively applied to practical coastal problems such as sediment transport and wave energy attenuation under coexistence of waves and current.

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