A Proper Directional Spreading Function (DSF) For Waves Climate of Hormuz Strait Zone

• Main Authors: Reza Gharangian, Mehdi Shafieefar, Roozbeh Panahi
• Format: Article
• Language: fas
• Published: Iranian Association of Naval Architecture and Marine Engineering 2015-09-01
• Series: نشریه مهندسی دریا
• Subjects: strait of hurmoz; directonal spreading function; cosine model; poisson model; hyperbolic model
• Online Access: http://marine-eng.ir/article-1-375-en.html

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.