  This study explores experimentally the turbulent flow in a laboratory flume,
interacting with waves propagated against the flow. It focuses a region of
wave-blocking for which there is a streamwise location on the water surface,
where the wave propagation velocity vanishes. The observations are corroborated
by finding a critical wave frequency for a particular discharge above which the
waves are effectively blocked; and verified by the dispersion relation of
monochromatic wave. The counter-current propagating waves show an evolutionary
change in the flow with three segmented regions, viz, flow at the upstream,
blocking at the mid-stream and waves in the downstream. The instantaneous
velocity data were collected using 3D Micro-acoustic Doppler velocimeter (ADV)
along the flume centerline. This study addresses the changes in the mean flows,
Reynolds stresses, eddy viscosity, turbulence kinetic energy fluxes and
associated contributions of burst-sweep cycles to the total Reynolds shear
stress due to addition of surface waves against a current. The velocity power
spectral analysis shows the energy distribution over the whole profile from
upstream to downstream. The quadrant analysis is also used to highlight the
turbulent event evolutions along the flow; and shows that at the waveblocking
and wave dominated regions, the contributions from ejection and sweep to the
total shear stress are dominant. The changes in turbulence key parameters due
to waveblocking may affect the sediment transport in coastal region
