EXPERIMENTAL ANALYSIS ON THE EFFECT OF BED VEGETATION SHRUB ON MANNING'S COEFFICIENT

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EBRAHIMI N.GH.; KASHEFIPOUR SEYED MAHMOUD; FATHI MOGHADAM MANOUCHEHR; EBRAHIM KIOUMARS; SANEI SEYED MOJTABA

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Journal: IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING Year:2008 | Volume:2 | Issue:3 Page(s): 37-42

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Title

EXPERIMENTAL ANALYSIS ON THE EFFECT OF BED VEGETATION SHRUB ON MANNING'S COEFFICIENT

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Keywords

VEGETATION ROUGHNESSQ3

MANNING'S COEFFICIENTQ3

FLUMEQ2

EXPERIMENTAL WORKQ2

Abstract

VEGETATION ROUGHNESSes coefficients are the main parameters used to determine river flow characteristics and are known to depend on the flow condition (depth and velocity) as well as vegetation condition (type and density). FLUME experiments were conducted to investigate the vegetation density for submerged vegetation in river bed, banks, and flood plains.Artificial plastic plants (shrub type), were laid on the floor of a 14 meter long and variable slope FLUME facilitated in the Hydraulics Laboratory of the Soil Conservation and Watershed Management Research Institute (SCWMRI), for this study. The Manning's (n) values were estimated for different slopes, discharges, and flow depth and vegetation densities. The results reveal that the Manning roughness coefficient (n) increases as vegetation density increases, while it decreases when the flow depth and velocity increase and also showed that the roughness coefficient (n) isn't constant and is a function of the flow velocity and depth of water. Significant variation of the Manning's (n) value with flow and vegetation conditions urges the consideration of the flow and vegetation conditions in estimation of the Manning roughness (n). Three equations were developed for estimation of roughness coefficients for rivers and flood plains, with different states of vegetation density, flow depth and velocity.

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APA: Copy

EBRAHIMI, N.GH., KASHEFIPOUR, SEYED MAHMOUD, FATHI MOGHADAM, MANOUCHEHR, EBRAHIM, KIOUMARS, & SANEI, SEYED MOJTABA. (2008). EXPERIMENTAL ANALYSIS ON THE EFFECT OF BED VEGETATION SHRUB ON MANNING'S COEFFICIENT. IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING, 2(3), 37-42. SID. https://sid.ir/paper/134827/en

Vancouver: Copy

EBRAHIMI N.GH., KASHEFIPOUR SEYED MAHMOUD, FATHI MOGHADAM MANOUCHEHR, EBRAHIM KIOUMARS, SANEI SEYED MOJTABA. EXPERIMENTAL ANALYSIS ON THE EFFECT OF BED VEGETATION SHRUB ON MANNING'S COEFFICIENT. IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING[Internet]. 2008;2(3):37-42. Available from: https://sid.ir/paper/134827/en

IEEE: Copy

N.GH. EBRAHIMI, SEYED MAHMOUD KASHEFIPOUR, MANOUCHEHR FATHI MOGHADAM, KIOUMARS EBRAHIM, and SEYED MOJTABA SANEI, “EXPERIMENTAL ANALYSIS ON THE EFFECT OF BED VEGETATION SHRUB ON MANNING'S COEFFICIENT,” IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING, vol. 2, no. 3, pp. 37–42, 2008, [Online]. Available: https://sid.ir/paper/134827/en

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