Abstract
Experiments have been carried out to determine the wave forces exerted on horizontal cylinder which are very close to bed in wave transformation zone. In the experimental condition, bottom slope was 1/10. Cnoidal wave theory was used to find out the near-bottom kinematics due to waves and the hydrodynamic wave forces. Since bottom slope is a very important effect on wave motion, wave forces depend on dimensionless local depth ratio (d/H). Experimental results with waves agree well with cnoidal wave solution.