WIND TURBULENCE OVER SHOALING SURFACE WAVES AND THEIR IMPACT ON AIR-SEA FLUXES Fabrice Veron(1), Fabio Addona(1), and Tetsu Hara(2) (1) University of Delaware, School of Marine Science and Policy, Newark, DE, UAS (2) University of Rhode Island, Graduate School of Oceanography, Narragansett, RI, USA The dependence of the drag coefficient (or the equivalent surface roughness) on sea states has been well documented. In coastal waters both observational and modeling studies show that the drag coefficient is significantly modified by shoaling waves as waves slow down and become steeper. Indeed, when deep-water waves travel through shallow waters, they become steeper and their phase speed is reduced. Furthermore, the shoaling wave shape is modified by wind forcing. The different wave shape influences the airflow field above, and as a result, the mean speed profiles, the pressure drag, and the occurrence of flow separation are strongly modified if compared to deep waters. In order to study the dependence of the drag coefficient on the wave shoaling process, we performed a set of laboratory experiments of mechanically-generated regular waves affected by shoaling and interacting with the wind. A combination of PIV (Particle Image Velocimetry) and LIF (Laser Induced Fluorescence) techniques are used to measure the 2D+time air-side velocity field, and to observe the wave shape. Using phase-locked ensemble averages, a triple decomposition of the velocity is performed and yields mean, wave-induced, and turbulent velocity fields. In this talk, we show the phase-dependent turbulent kinetic energy, vorticity, and pressure fields during the shoaling process, and attempt to retrieve the relative contribution of the viscous stress, wave drag, and turbulent stress.