نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه اقیانوس شناسی فیزیکی، دانشکده منابع طبیعی و محیط زیست، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
2 دانشکده علوم دریایی و محیطی، دانشگاه مازندران، بابلسر، ایران
3 گروه فیزیک فضا، موسسه ژئوفیزیک، دانشگاه تهران، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Acoustic signals are used for seafloor mapping, marine communications, detecting obstacles and barriers to sound propagation which have reflective or absorptive effects. This can be used to explore oil slicks or objects on the water. In this paper, both laboratory experiments and computer simulations are used to identify the material of the surface layer. For this purpose, a sound wave with a frequency of 59 kHz was emitted in a homogeneous environment under laboratory conditions and the data were collected. The experiment was performed using a tank with free surface and oil cover and with transmitter being positioned at different angles. Ray theory is used to verify the experimental laboratory results with computer simulation results. The experiments were performed in a 300 cm long, 50 cm wide and 80 cm deep glass tank. According to the simulation results, the accumulation of rays occurs at depths above 50 cm. By considering the temporal differences that appear in different patterns that are due to different surface layers and stratification, it is possible to determine the material of the surface layer and how sound moves in water. Also, the angle of the transmitter has a great effect on the sound signal. According to the results, sound is better emitted when the transmitter angle is 45 degrees.
کلیدواژهها [English]