Submarine continuous sand waves and complex tidal currents in the estuary and coastal areas have gradually drawn attention to the hydrodynamic interaction processes between ambient flow and continuous rippled bottoms. Focusing on the situation for steady free-surface flow over continuous undulating topography, the new wave components (as upstream-propagating waves) are generated on the free surface of the steady flow under specific conditions. The flow field during the wave excitation process is quantitatively observed based on the further exploration of observational data measured using Acoustic Doppler Velocimetry from the flume experiments performed. The turbulence intensity and spatial distribution characteristics above the rippled bottoms are analyzed. This aims to elucidate the turbulent dynamic characteristics of the flow field during wave excitation and its relationship with the wave excitation process.