کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6382931 | 1626094 | 2016 | 50 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrodynamics and sediment suspension in shallow tidal channels intersecting a tidal flat
ترجمه فارسی عنوان
هیدرودینامیک و تعلیق رسوب در کانال های جزر و مدی کوچک که تقسیم مسطح جزر و مدی است
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کلمات کلیدی
مسطح، کانال جزر و مد هیدرودینامیک، سرعت استرس برشی، تعلیق رسوب،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
A field study was conducted on a tidal flat intersected by small tidal channels (depth <0.1Â m, width <2Â m) within a tidal marsh. Data were collected in the channels, and on the adjacent tidal flat that encompasses approximately 1600Â m2 in planform area. Hydrodynamic processes and sediment suspension between the channels and adjacent flat were compared. Shear stress and turbulent kinetic energy were computed from high frequency velocity measurements. Maximum water depth at the field site varied from 0.11Â m during the lowest neap high tide to 0.58Â m during a storm event. In the channel intersecting the tidal flat, the shear stress, turbulence and along-channel velocity were ebb dominant; e.g. 0.33Â m/s peak velocity for ebb compared to 0.19Â m/s peak velocity for flood. Distinct pulses in velocity occurred when the water level was near the tidal flat level. The velocity pulse during flood tide occurred at a higher water level than during ebb tide. No corresponding velocity pulse on the tidal flat was observed. Sediment concentrations peaked at the beginning and end of each tidal cycle, and often had a secondary peak close to high tide, assumed to be related to sediment advection. The influence of wind waves on bed shear stress and sediment suspension was negligible. Water levels were elevated during a storm event such that the tidal flat remained inundated for 4 tidal cycles. The water did not drain from the tidal flat into the channels during the storm, and no velocity pulses occurred. Along-channel velocities, turbulent kinetic energy, and shear stresses were therefore smaller in the channels during storm conditions than during non-storm conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Continental Shelf Research - Volume 119, 15 May 2016, Pages 40-55
Journal: Continental Shelf Research - Volume 119, 15 May 2016, Pages 40-55
نویسندگان
Aline Pieterse, Jack A. Puleo, Thomas E. McKenna,