TY - JOUR T1 - A Proper Directional Spreading Function (DSF) For Waves Climate of Hormuz Strait Zone TT - ارائه یک تابع توزیع جهتی مناسب برای امواج محدوده منطقه تنگه هرمز JF - Marine-Engineering JO - Marine-Engineering VL - 11 IS - 21 UR - http://marine-eng.ir/article-1-375-en.html Y1 - 2015 SP - 95 EP - 108 KW - Strait of Hurmoz KW - Directonal Spreading Function KW - Cosine Model KW - Poisson Model KW - Hyperbolic Model N2 - In this article by evaluating the performance of standard Directional Spreading Functions (DSFs) with those of field DSs at the Strait of Hormuz, such standard DSFs have been calibrated. Here, field DSs have been extracted considering the region extreme events based on up to 20 months field measurements at four different 25m stations. Statistical assessment of standard DSFs clearly showed their lack of accuracy. So, a calibration procedure considering their introduced coefficients as variables using generalized reduced gradient method was used. Such procedure has been implemented with and without considering the event's direction for Cosine-power, Poisson and hyperbolic DSFs. Results show a great improvement up to 60% in terms of their conformity. So, such calibrated DSFs could be used as a better approximation of wave directional distribution based on available measurements at the region. M3 ER -