شبیه‏ سازی عددی امواج بادپناه در تنگه‌هرمز با استفاده از مدل Delft3D

نوع مقاله : مقاله پژوهشی

نویسنده

پژوهشگاه ملی اقیانوس شناسی و علوم جوی، تهران، ایران.

چکیده

امواج درونی نقش اساسی در وضعیت هیدرولوژیکی و انرژی اقیانوس‌ها دارد یکی از انواع امواج درونی امواج بادپناه است که در اثر عبور جریان‏های زیرسطحی یا جزرومدی بر روی توپوگرافی بستر دریا به وجود می‏آیند و یکی از عوامل جابه‌جایی لایه‏های همچگالی در زیر آب است. این موضوع باعث تغییر میزان مواد مغذی دریا و چگالی دریا خواهد شد. به‌همین دلیل شناخت امواج بادپناه در صنایع ماهی‏گیری و نظامی از اهمیت بالایی برخوردار است.
در این مقاله با استفاده از ماژول جریان مدل سه‌بعدی Delft3D به‌صورت هیدرواستاتیک و غیرهیدرواستاتیک در تنگه‌هرمز که به‌دلیل داشتن کم‏عمقی‏های فراوان مستعد تشکیل موج بادپناه می‌باشد شبیه‏سازی امواج بادپناه انجام شده است و با استفاده از تصویر ماهواره‏ای SAR، داده میدانی و مطالعات پیشین اعتبارسنجی صورت گرفت. نتایج وجود امواج بادپناه در تنگه‌هرمز را نشان می‎دهند. هر دو مدل هیدرواستاتیک و غیرهیدرواستاتیک توانسته‏اند جهت انتشار و تولید امواج درونی را با تقریب مکانی قابل‌قبول شبیه‏سازی کنند، با این تفاوت که مدل غیرهیدرواستاتیک دارای مقادیر سرعت جریان بزرگ‌تری می‏باشد، هرچند که نتایج هر دو مدل در دامنه 4/0- تا 4/0+ cm/s می‏باشد. با این‌حال می‌توان گفت حالت هیدرواستاتیک اغتشاش‏های بیشتری را نشان می‏دهد و به‌دلیل استفاده از مختصات قائم سیگما، لایه ترموکلاین را با دقت بالاتری شبیه‏سازی می‏کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical simulation of lee waves in the Strait of Hormuz using Delft3D model

نویسنده [English]

  • Hamed Deldar
Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran.
چکیده [English]

Internal waves play an essential role in the hydrological state and energy of the oceans. One of the types of internal waves is lee waves, which are created by the passage of subsurface or tidal currents on the topography of the seabed, and are one of the factors of displacement of isodensity surfaces under water. This can change the amount of nutrients in the sea and the density of the sea. For this reason, the knowledge of lee waves has great importance in the fishing and military industries. In this article, by using Delft3D three-dimensional model flow module hydrostatically and non-hydrostatically in the Strait of Hormuz, which is prone to the formation of lee waves due to its many shallow channels, the simulation of lee waves has been carried out and by using satellite images SAR, field data and previous studies were validated.
Two general open borders were applied to the border conditions, one on the side of the Gulf of Oman and the other on the side of the Persian Gulf. Each of these boundaries was divided into 4 smaller boundaries for more accuracy in the simulation. In the surface layer of open boundaries, water level, water temperature and salinity were applied, and in the vertical layers of open boundaries, water temperature and salinity were applied. For water level, TPXO9 data, which has spatial resolution of 1.3 degrees and a time resolution of one hour, were used. For salinity and water temperature, data from the HYCOM model has been used, which these data has 40 layers resolution. A grid space of 0.08 degrees and time resolution of three hours have been used. In the current 3D model, 20 layers have been used, the depth of the layers near the water surface and the crest of the obstacles is about 4 meters and in the middle layers up to 25 meters.
The satellite image of Sentinel-1 or SAR was used to verify the results. After receiving the images, radiometric and geometric corrections were applied. Then VV polarization was selected. In the results section, for further validation, the measured data of water temperature at a depth of twenty meters was used. These data were collected by mooring method in the south of the Strait of Hormuz at coordinates 56 between February 5, 2022 and May 7, 2022 in the form of time series.
From the examination of the wavelengths formed, it can be seen that the hydrostatic model shows more disturbance. Also, the hydrostatic model shows the stratification of the thermocline more accurately, so that after comparing with previous researches, this issue is well deduced.
From the examination of satellite images with vertical velocity formed in the simulation, it can be seen that both hydrostatic and non-hydrostatic models are able to simulate the direction of propagation and generation of internal waves with an acceptable spatial approximation, with a difference that the non-hydrostatic model has larger flow velocity values, although the results of both models are in the range of -0.4 to +0.4 cm/s.
Comparing the measurement data at a depth of 20 meters with the model results showed that the hydrostatic model is closer to the mooring data and was able to reconstruct the formed lee waves.

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فیزیک زمین و فضا
دوره 50، شماره 2
تاریخ انتشار الکترونیکی: 16 تیر 1403
تیر 1403
صفحه 451-463

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