کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8886030 1627260 2017 35 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sediment resuspension and the generation of intermediate nepheloid layers by shoaling internal bores
ترجمه فارسی عنوان
احیا مجدد رسوب و ایجاد لایه های نافلهویید متوسط ​​با استفاده از سوراخ های داخلی
کلمات کلیدی
لایه های نافلهلویدی متوسط، مجدد رسوب حفره های داخلی، امواج داخلی، شبیه سازی عددی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی
Numerical simulations of sediment resuspension due to shoaling internal bores are performed with a nonhydrostatic model, SUNTANS. Results show strong sediment resuspension induced by internal bores and a turbidity layer intruding offshore in the interior of the water column, known as an intermediate nepheloid layer (INL). Sediment resuspension processes and INLs reproduced in the model are in good agreement with observational data from Otuschi Bay, Japan. The formation of INLs by shoaling internal waves is explained as follows: (1) strong receding currents due to a previous run-up bore cause sediment resuspension along the slope, (2) the interaction of the receding currents and a subsequent run-up bore induce horizontal flow convergence and strong upward currents, (3) the upward currents lift the suspended sediments into the interior of the water column, (4) the run-up bore intrudes below the suspended sediments and forms an INL within the pycnocline. Sediment resuspension processes are also investigated for various internal Iribarren number conditions. The internal Iribarren number represents the ratio of the topographic slope to the internal wave steepness. In low internal Iribarren number conditions, strong currents near the bottom result in sediment resuspension and INL formation. In high internal Iribarren number conditions, sediment resuspension is weak, and INLs do not form.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Marine Systems - Volume 170, June 2017, Pages 31-41
نویسندگان
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