Wind waves are familiar but extremely complicated stochastic phenomena that are controlled by strongly nonlinear processes of turbulence and wave breaking. A long history of studies on wind waves has much advanced our ability to forecast their evolution for practical or engineering purposes. There still remain a number of fundamental problems to be solved, however, as regards their generation, growth, and decay. This short article briefly presents a few topics on wind waves among the studies carried out in our institute : (1) wind-wave effects on the roughness of the sea surface, (2) new schemes for computing nonlinear energy transfer among wind waves, (3) interaction of swells (long waves) and wind waves (short waves), and (4) nonlinear properties of wind waves and higer-order spectra.
