زکیه کاظمی
زکیه کاظمی
پایاننامه برای دریافت درجه کارشناسی ارشد در رشته مهندسی عمران گرایش مهندسی آب وسازههای هیدرولیکی
عنوان:
مطالعه سرعت متوسط در عمق و تنشی برشی بستر در رودخانه با استفاده از روش SKM
استاد راهنما:
دکتر بهرام رضائی
اساتید داور:
دکتر جلال صادقیان-دکتر مرتضی شکری
دانشجو:
زکیه کاظمی
زمان و مکان:
7/7/95 ساعت 16
سالن آمفی تئاتر دانشکده فنی و مهندسی
واژههای کلیدی: سرعت متوسط در عمق، تنش برشی، جریان ثانویه، روش دوبعدی شیونو-نایت
Abstract:
Finding a suitable method for estimating velocity in natural channels has been one of the concerns of river engineering specialists for a long time, That is why many methods have been developed to estimate flow rates. One of them is the two-dimensional SKM method that was first used in prismatic compound channels. Determination of lateral velocity distribution in compound channels is complicated due to the presence of strong secondary flows. This complexity is more pronounced in rivers because of their irregular cross sections. Under such conditions, prediction of flow rates seems to be a difficult task. Moreover, estimation of velocity in compound channels, especially in rivers, using classical methods such as the Manning’s equation results in a greater amount of error compared to the actual results due to the interaction between the flow in the main channel and those in floodplains. Identification of some factors that influence flow behavior is required in studying river flows. To identify these factors, we can combine data obtained in the laboratory and that derived from analytical and numerical models. This thesis used the Shiono-Knight method, which is based on solving two-dimensional equations for open channel flows by averaging the Navier-Stokes equations. Values of depth-averaged velocities and of shear stress were calculated first, and those of flow discharge were then estimated and compared with values obtained from measurements. Results indicated the Shiono-Knight method was suitably capable of estimating depth-averaged velocity provided correct basic information was available.
Key Words: Depth-Averaged Velocity, Boundary Shear Stress, Secondary flow, The Shiono And Knight Method.