Validation of Double-Averaged Velocity Method for Decelerating Flow in Coarse-bed Rivers

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AFZALIMEHR HOSSEIN; Ramazany Rasool

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Paper Information

Journal: JOURNAL OF HYDRAULICS Year:2019 | Volume:14 | Issue:2 (142) Page(s): 47-67

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Title

Validation of Double-Averaged Velocity Method for Decelerating Flow in Coarse-bed Rivers

Author(s)

AFZALIMEHR HOSSEIN | Ramazany Rasool | Issue Writer Certificate

Keywords

Double Averaging MethodQ1

Logarithmic LawQ1

Boundary Layer Characteristics MethodQ1

Decelerating FlowQ1

Coarse-bed RiversQ1

Abstract

A clear understanding of the interaction of bed-form and flow characteristics in natural streams is essential for a variety of ecological and river engineering projects such as river rehabilitation, pollution control, and stable channel design. The present study deals with the logarithmic layer of double-averaged (in time and space) streamwise velocity profiles in Decelerating Flow, in Coarse-bed Rivers. The streamwise velocity profiles were obtained from field measurements conducted in the Haraz and Rostam Abad Rivers. Velocity measurements were collected at 200 Hz and 120 seconds by using an Acoustic Doppler Velocimeter (ADV). In Both cases, the river bed was composed of coarse gravel and cobble, with relative submergences ( 50 h/d ) from 4. 4 to 10. 4. Due to the limitations in double-averaging method application in the Iranian Rivers, the validity of this method was investigated using the Logarithmic Law and the boundary layer characteristic method. Based on the observations, the flow may be divided into the two different layers: the inner layer (logarithmic layer) and the outer layer. In the inner layer ( 0. 02 z / h 0. 3 ), the double-averaged velocity profiles confirmed the Logarithmic Law. However, the velocity data deviated from the Logarithmic Law in the outer region without a particular pattern. The results of this study can help a better estimation of hydraulic parameters in coarse-bed streams, decreasing the cost of the hydraulic engineering plans in rivers.

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APA: Copy

AFZALIMEHR, HOSSEIN, & Ramazany, Rasool. (2019). Validation of Double-Averaged Velocity Method for Decelerating Flow in Coarse-bed Rivers. JOURNAL OF HYDRAULICS, 14(2 (142) ), 47-67. SID. https://sid.ir/paper/124172/en

Vancouver: Copy

AFZALIMEHR HOSSEIN, Ramazany Rasool. Validation of Double-Averaged Velocity Method for Decelerating Flow in Coarse-bed Rivers. JOURNAL OF HYDRAULICS[Internet]. 2019;14(2 (142) ):47-67. Available from: https://sid.ir/paper/124172/en

IEEE: Copy

HOSSEIN AFZALIMEHR, and Rasool Ramazany, “Validation of Double-Averaged Velocity Method for Decelerating Flow in Coarse-bed Rivers,” JOURNAL OF HYDRAULICS, vol. 14, no. 2 (142) , pp. 47–67, 2019, [Online]. Available: https://sid.ir/paper/124172/en

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