Subsurface shape factor for surface irrigation hydraulics

Seyedzadeh, Amin; Panahi, Amir; Maroufpoor, Eisa; Merkley, Gary P.

doi:10.1002/ird.2679

Cited by 2 publications

(1 citation statement)

References 18 publications

(17 reference statements)

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“…Seyedzadeh, Panahi, et al (2022) and Kiefer (1965) presented relationships based on the values of r and a in the form of Equations () and (), respectively, to determine the value of the subsurface water storage shape factor:

σ_{z} goodbreak= \frac{1}{1 + italicra}

σ_{z} goodbreak= \frac{a + r ((), 1 goodbreak- a) + 1}{((), a goodbreak+ 1) ((), 1 goodbreak+ r)}

…”

Section: Methodsmentioning

confidence: 99%

Determining Kostiakov–Lewis infiltration coefficients using the water advance relationship and optimization

Panahi

Seyedzadeh

Bahrami

et al. 2023

Irrigation and Drainage

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Two exponential relationships ([1] from the beginning to the midpoint of the field, [2] from the beginning to the endpoint of the field) were considered for the advance curve of surface irrigation water along a field. The constant coefficients of these advance relationships were determined using the least squares optimization method. These relationships were compared with the advanced relationships obtained by the Elliott and Walker method (EW) using the advanced data related to 14 irrigation events and using root mean square error deviation (dRMS) and Nash–Sutcliffe (NSE) indices. The results of this evaluation showed that the advanced relationships obtained from the method presented in this research (TR) have better accuracy, with average values of 7.05 min and 0.984 for dRMS and NSE, respectively. Then, using the TR method for deriving the advance relationships and using the volume balance method, the coefficients of the Kostiakov–Lewis infiltration relationship were determined. The infiltration relationships derived from the TR method were compared with the infiltration relationships obtained from the two‐point method of EW. The results of this investigation showed that the TR method predicts the average infiltration depth with an average absolute relative error of 6%, which is more accurate than that of EW.

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σ_{z} goodbreak= \frac{1}{1 + italicra}

σ_{z} goodbreak= \frac{a + r ((), 1 goodbreak- a) + 1}{((), a goodbreak+ 1) ((), 1 goodbreak+ r)}

…”

Section: Methodsmentioning

confidence: 99%

Determining Kostiakov–Lewis infiltration coefficients using the water advance relationship and optimization

Panahi

Seyedzadeh

Bahrami

et al. 2023

Irrigation and Drainage

Self Cite

View full text Add to dashboard Cite

show abstract

Water depth and cross‐sectional area relationships in sloping surface irrigation systems

Seyedzadeh,

Panahi,

Maroufpoor

2024

Irrigation and Drainage

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The equations governing variations in water depth and cross‐sectional area along a field are crucial for solving the Saint‐Venant equations and determining surface water volume via the volume balance method to determine other hydraulic parameters of surface irrigation systems. Various researchers have proposed different formulations for this equation based on varying assumptions. In many investigations, the flow depth profile has been assumed to be parallel to the furrow bottom or modelled as an elliptical relationship. This study explored four different forms of equation to analyse changes in the water depth profile and to refine its mathematical representation. The coefficients of these equations were derived as functions of the surface storage coefficient. Using field data, the surface storage coefficient values and, consequently, the coefficients of the proposed relationships were determined. The calculated values of the flow cross‐sectional area along the field and the water surface storage volume were compared with the measured values using the established relationships. The most accurate relationship for estimating the flow depth profile was identified through this analysis.

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Subsurface shape factor for surface irrigation hydraulics

Cited by 2 publications

References 18 publications

Determining Kostiakov–Lewis infiltration coefficients using the water advance relationship and optimization

Determining Kostiakov–Lewis infiltration coefficients using the water advance relationship and optimization

Water depth and cross‐sectional area relationships in sloping surface irrigation systems

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