کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4553714 1328922 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Water levels in a dual-basin harbour in response to infragravity and edge waves
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Water levels in a dual-basin harbour in response to infragravity and edge waves
چکیده انگلیسی

Seiche modes in a compound harbour (an “Outer Harbour” connected both to the sea and to an “Inner Harbour”) were studied using water level data and a numerical model. A variety of harbour oscillations are present, with periods up to 67 min. Periods longer than 25 min exceed resonant modes of the harbour. This paper addresses the characteristics and causes of the open-basin modes. The dual harbour open-basin mode is modified by constriction at the connection between harbours, by partial reflection at the antinode, and by the geometry of the entrance. The single-harbour open-basin mode excites the dual harbour closed-basin mode, which has nearly the same period. This forcing moves the closed-basin antinode and slightly changes the modal period, but the coupling permits the amplitude to increase through the closed-basin resonance. The water level response to wind stress is weak, but significant residual currents can occur, which take the form of clockwise gyres in each basin. Energetic peaks in the water level spectrum at 26, 35, and 67 min are shown to correspond to possible edge waves on the local shelf. The work has practical implications to port design, e.g. towards minimisation of ship ranging while at anchor.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Oceanography - Volume 77, Issue 4, June 2008, Pages 367–375
نویسندگان
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