کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4533421 1325191 2008 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Variability of secondary currents in a weakly stratified tidal inlet with low curvature
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Variability of secondary currents in a weakly stratified tidal inlet with low curvature
چکیده انگلیسی
Long-term ferry acoustic Doppler current profiler (ADCP) and surface density data collected in the period 2000-2002, and ADCP data and vertical profiles of density collected during several 13-h surveys in the period 2003-2006 provide insight in the variability of instantaneous secondary (transverse) currents in the 4 km wide and 27 m deep Marsdiep tidal inlet, the Netherlands. The application of the data to the transverse momentum balance indicates that centrifugal and Coriolis accelerations and baroclinic pressure gradients govern the observed secondary circulations. In well-mixed conditions, local curvature (|Rs|≈10km) dominates over Coriolis forcing in driving secondary currents. In stratified conditions transverse density gradients become more important than centrifugal and Coriolis accelerations. The data suggests that the well-mixed Marsdiep inlet falls in the regime where stratification still enhances secondary currents. In the inlet the vertical stratification of maximally O(1kgm-3) is in part set up due to transverse density gradients. The stratification dampens turbulent mixing, which allows for surface secondary currents up to 0.4ms-1 (∼30% of the streamwise currents).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Continental Shelf Research - Volume 28, Issue 14, 15 August 2008, Pages 1711-1723
نویسندگان
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