DEVELOPMENT OF ANALYTICAL MODEL ON DETERMINATION OF STABLE HYDRAULIC GEOMETRY OF ALLUVIAL GRAVEL BED RIVERS

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KARAMI MARYAM; MAJEDZADEH TABATABAI M.R.

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Journal: Civil Engineering Infrastructures Journal Year:2010 | Volume:43 | Issue:1 Page(s): 105-115

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Title

DEVELOPMENT OF ANALYTICAL MODEL ON DETERMINATION OF STABLE HYDRAULIC GEOMETRY OF ALLUVIAL GRAVEL BED RIVERS

Author(s)

KARAMI MARYAM | MAJEDZADEH TABATABAI M.R. | Issue Writer Certificate

Keywords

HYDRAULIC GEOMETRYQ2

STABLE SECTIONQ3

OPTIMUM WIDTHQ3

BANK VEGETATIONQ2

ANALYTICAL MODELQ1

Abstract

Modeling the HYDRAULIC GEOMETRY of Gravel Rivers is of interest to hydraulic engineers, hydrologists and environmental scientists who are engaged in predicting the adjustments of an alluvial channel to an altered upstream runoff or sediment supply. The widely used qualitative and regime models, while indicating the general direction of river adjustment, are not able to deal with river response at a quantitative level. On the other hand the existing ANALYTICAL MODELs do not predict channel geometry to the accuracy required for engineering applications. In this paper a bank stability analysis is incorporated into an analytical procedure for modeling the HYDRAULIC GEOMETRY of an alluvial gravel-bed channel. The bank stability criterion account for the increased stability of the channel banks due to effect of the BANK VEGETATION and binding of the sediment by root masses. The ova key parameters in the bank stability analysis are the median grain diameter of the bank sediment, D50bank and the modified faction angle of the bank sediment, j. A sensitivity analysis of the two parameters indicates that the bank stability can exert a large influence on the channel geometry. This is supported by testing the theory on published field data. The bank sediment size was assumed to equal the bed sediment size, and the variation of the faction angle, j, was investigated. The estimated j values are seen to increase systematically with the BANK VEGETATION density. The results indicate that increased bank stability induced by the vegetation has- a significant influence on channel geometry. The vegetated channels are narrower, deeper and less steep. For well developed BANK VEGETATION, the channel width was found 0.6 time its unvegetated channel width.

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APA: Copy

KARAMI, MARYAM, & MAJEDZADEH TABATABAI, M.R.. (2010). DEVELOPMENT OF ANALYTICAL MODEL ON DETERMINATION OF STABLE HYDRAULIC GEOMETRY OF ALLUVIAL GRAVEL BED RIVERS. CIVIL ENGINEERING INFRASTRUCTURES JOURNAL (CEIJ) (JOURNAL OF FACULTY OF ENGINEERING), 43(1), 105-115. SID. https://sid.ir/paper/166585/en

Vancouver: Copy

KARAMI MARYAM, MAJEDZADEH TABATABAI M.R.. DEVELOPMENT OF ANALYTICAL MODEL ON DETERMINATION OF STABLE HYDRAULIC GEOMETRY OF ALLUVIAL GRAVEL BED RIVERS. CIVIL ENGINEERING INFRASTRUCTURES JOURNAL (CEIJ) (JOURNAL OF FACULTY OF ENGINEERING)[Internet]. 2010;43(1):105-115. Available from: https://sid.ir/paper/166585/en

IEEE: Copy

MARYAM KARAMI, and M.R. MAJEDZADEH TABATABAI, “DEVELOPMENT OF ANALYTICAL MODEL ON DETERMINATION OF STABLE HYDRAULIC GEOMETRY OF ALLUVIAL GRAVEL BED RIVERS,” CIVIL ENGINEERING INFRASTRUCTURES JOURNAL (CEIJ) (JOURNAL OF FACULTY OF ENGINEERING), vol. 43, no. 1, pp. 105–115, 2010, [Online]. Available: https://sid.ir/paper/166585/en

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