نتایج جستجو برای: groyne
تعداد نتایج: 77 فیلتر نتایج به سال:
This dissertation presents a detailed numerical study using fully three-dimensional Large Eddy Simulation (LES) simulations of the flow and mass exchange processes in straight channels containing one or multiple embayments with vertical spanwise walls on one side corresponding to the presence of groynes in river reaches. The main focus is on identifying, understanding and quantifying the role p...
A unique set of field measurements taken along Galveston beach have been compiled to give annual shoreline positions over the period 2010–2016. These used, in conjunction with statistical and mathematical modelling, gain insights into response after landfall Hurricane Ike 2008, which caused extensive erosion loss material from beach. Over 2010–2014, a generally accretive trend is observed Withi...
Abstract. River sediments falling dry at low water levels are sources of CO2 to the atmosphere. While general relevance emissions from has been acknowledged and some regulatory mechanisms have identified, knowledge on temporal dynamics is still sparse. Using a combination high-frequency measurements two field campaigns we thus aimed identify processes responsible for assess large German river. ...
Accretion-erosion conversion in the subaqueous Yangtze Delta in response to fluvial sediment decline
Identifying the pattern of delta morphological change under decreasing sediment flux due to dam construction is essential for sustainable management in such densely populated coastal areas. In this study, we investigated processes Yangtze mouth bar and prodelta based on bathymetric data a decadal-interannual scale (1958, 1978, 1997, 2002, 2007, 2010, 2013 2015). We found that strong accretion (...
در قوس رودخانه، نیروهای هیدرودینامیکی جریانهای ثانوی را بوجود می آورند که خطوط جریان سطحی را به سمت ساحل بیرونی و خطوط جریان نزدیک به بستر را به سمت ساحل داخلی منحرف می سازند. در مقطع جریان درامتداد قائم، خطوط جریان مجاور ساحل بیرونی بطرف پایین و خطوط جریان پشته متمرکز داخلی به طرف بالا هستند در نتیجه پایداری ذره در نزدیکی ساحل خارجی بهم می خورد و بستر رودخانه گود می شود و از طرف دیگر در مج...
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