fa بررسی آزمایشگاهی تاثیر آبخور، جرم و ارتفاع تیغه موج‌شکن شناور پانتونی تیغه‌دار بر میزان ضرایب انتقال و بازتاب در معرض امواج نامنظم سازه کشتی Ship Structure مقاله پژوهشي Research Paper In this research study, effects of the draught and sheet height in pontoon floating sheet-breakwaters on the transmission and reflection coefficients against irregular sea waves was investigated. The project has been carried out using an experimental method within a wave flume of Soil Conservation and Watershed Research Institute. The incident waves were irregular and the wave spectrum was JONSWAP. The range of wave heights varied between 2 and 12cm and their mean periods were set to be between 0.63 and 1.26 seconds. To investigate the effect of draught in pontoon breakwaters, three experimental model with similar breadth and different draughts of 8, 10 and 12 cm were tested. Also, in order to investigate effect of sheet height in pontoon sheet breakwaters, sheet heights with 8, 16 and 24 cm were examined and compared without sheet case. The water depth was set to be 60 cm. The number of waves for each test was 250. : Floating Breakwaters, Experimental Model, Sheet Height, Transmission Coefficient, Reflection Coefficient 17 28 http://marine-eng.ir/browse.php?a_code=A-10-39-2&slc_lang=fa&sid=1 Narges Forozande نرگس فروزنده 1003194753284600477 1003194753284600477 No ., Faculty of Civil Eng., Sahand University of Technology دانشگاه صنعتی سهند Habib Hakimzade حبیب حکیم زاده 1003194753284600478 1003194753284600478 Yes ., Faculty of Civil Eng., Sahand University of Technology دانشگاه صنعتی سهند Paiman Aghtoman پیمان آق تومان 1003194753284600479 1003194753284600479 No Soil Conservation and Watershed Research Institute دانشگاه صنعتی سهند Ali Karamy khaniki علی کرمی خانیکی 1003194753284600480 1003194753284600480 No Soil Conservation and Watershed Research Institute دانشگاه صنعتی سهند