HYDRODYNAMIC FORCES ON BOTTOM-SEATED HEMISPHERE IN WAVES AND CURRENTS

H. Nishida, A. Tada, F. Nishihira

Abstract


The characteristics of hydrodynamic forces acting on a bottom-seated hemisphere in waves only , in currents only and in waves & currents are presented from the viewpoint of the design of an artificial reef. A large number of regular wave experiments were conducted in order to find the empirical formulas of the hydrodynamic coefficients for the bottom-seated hemisphere . It is shown that the proposed empirical formulas are sufficiently accurate for predicting the hydrodynamic forces. The effects of the normalized water depth and hemisphere spacing relative to its diameter are also elucidated experimentally.

Keywords


hemisphere; hydrodynamic forces; wave force; current force

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