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Estimation of shortwave directional distribution from HF radars: Comparison with model predictionsby Yukiharu Hisaki (University of the Ryukyus)Abstract The radarestimated directional distributions of Bragg wavelength are estimated from the ratio of observed firstorder scattering. These shortwave directional distributions are estimated for the 2parameter model and 4parameter model. The shortwave directional distributions are compared with model predictions from the wave energy balance equation and the agreement is good. The parameterization of the source function in the energy balance equation is investigated. In particular, the effect of the nonlinear source function on the prediction of shortwave directional distributions is investigated. The nonlinear source function is calculated from both the exact computation and the Discrete Interaction Approximation (DIA). The agreement between radarestimated shortwave directional distributions and model predictions is good. The 4parameter model is better than the 2parameter model to estimate shortwave directional distribution from HF ocean radar. The shortwave direction change associated with a sudden wind shift can be reproduced both from the exact computation and the DIA. The shortwave directional distributions calculated from the exact computation are narrower than those calculated from the DIA and estimated from the HF radar. 
