Analytical Study of the Depth Velocity Distribution in Compound Channels

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Analytical Study of the Depth Velocity Distribution in Compound Channels

ارائه دهنده: Provider: shiva doodi

اساتید راهنما: Supervisors: dr bahram rezaei

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: dr jalal sadeghian - dr morteza shokri

زمان و تاریخ ارائه: Time and date of presentation: 9/2/2022 16-18 wednesday February 11th

مکان ارائه: Place of presentation: http://vc.basu.ac.ir/eng-thesis02

چکیده: Abstract: Finding the depth velocity distribution profile in a cross section of compound channels has been one of the tasks of hydraulic and river engineers and has been researched by researchers for years. The velocity distribution across the river is the basis of hydraulic modeling, flow propagation, sediment transport, pollution transfer and river behavior and is directly related to various flow characteristics such as shear stress distribution, water level profile estimation, channel capacity measurement and other flow characteristics. In open conduits such as rivers and channels, the velocity increases from zero at the bottom of the channel to maximum at the water surface or under the water surface. In narrow channels, in addition to the vertical direction, the velocity also changes in the transverse direction, so the velocity distribution is considered two-dimensional. The purpose of this study is to more accurately identify flow behavior and analytical study of velocity distribution in depth in compound prismatic and non-prismatic channels. So far, a lot of research has been done on simple prismatic prismatic channels, but compound prismatic and non-prismatic channels have not been properly studied. In this research, by simplifying the Navier-Stokes equations, a model for velocity distribution has been proposed that allows estimating the velocity distribution in depth in natural and artificial open channels (wide and narrow). For this purpose, among the various mathematical models proposed, Bonakdari Analytical Equations (2008) have been selected that can be used in both wide and narrow channel categories. This model has the ability to display the dip-phenomenon and the negative velocity gradient near the free water surface. Using these equations and in areas of the prismatic and non-prismatic compound channel where the transverse gradient is zero velocity, the velocity distribution is simulated in depth and compared with laboratory data

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