Basic Equations for the Gradually-Varied Flow

Jan, Chyan Deng

doi:10.1007/978-3-642-35242-3_1

Cited by 1 publication

(1 citation statement)

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“…The friction slope was approximated using Manning's equation: (2) where S f is the friction slope which is positive in the downward is Manning's roughness coefficient, V is the crosssectional mean velocity, is a constant equal to 1.49 for English units and 1.00 for SI units, and R is the hydraulic radius. A variety of mathematical techniques can be applied in a traditional method to generate the results [23]. In this case, due to the effect of the Ogee weir, the boundary condition of the G.V.F equation had to be determined carefully.…”

Section: Methodology and Calculationsmentioning

confidence: 99%

The Impact of Operational Scenarios and Concrete Aging Factor on the Freeboard Height of an Irrigation Canal

Kazem

Nazari-Sharabian²,

Afzalimehr³

et al. 2023

Eng. Technol. Appl. Sci. Res.

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The prediction of operational freeboard in irrigation canals is a complicated issue, particularly when the cumulative effects of time-dependent factors, such as maloperation and concrete aging, are considered. While most classic approaches consider a fixed freeboard due to uniform flow as a fundamental assumption. Τhis study proposes a flowchart considering the effects of nonuniform flow to determine the adequacy of the freeboard of irrigation canals under different conditions, including time-dependent and operational scenarios. The results of this method indicated that the freeboard values obtained by classical methods may not be sufficiently reliable in providing the appropriate level of performance in the operating conditions of agricultural canals. Regarding the case study of this paper, an irrigation canal in Kurdistan-Iran, the results showed that the formation of the M1 profile is the most critical scenario and the initial freeboard must be extended by 20cm at a distance of about 2.3Km at the end of the canal towards upstream.

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Section: Methodology and Calculationsmentioning

confidence: 99%