Determination of Optimal Unit Hydrographs and Green-Ampt Parameters for Watersheds

Che, Daniel; Nangare, Mandar; Mays, Larry W.

doi:10.1061/(asce)he.1943-5584.0000798

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…Barati (2013) applied spreadsheet based optimization technique to obtain optimal parameters of nonlinear Muskingum flood routing equation. Che et al (2014) demonstrated that GRG technique is an efficient means for determination of optimal unit hydrograph of watersheds. Discharge rating curve at a gauging site was established by using GRG technique by Muzzamil et al (2015).…”

Section: Grg Optimization Techniquementioning

confidence: 99%

Assessment of Dimensionless Form of Kostiakov Model

Zakwan

2017

Aquademia: Water, Environment and Technology

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Infiltration is the process by which water enters the earth's surface. Although contribution of soil water to total water present on earth surface is negligible, but it is of prime importance for plant life. Very recently, dimensionless form of Kostiakov equation was proposed for precise estimation of Kostiakov model parameters. The present paper is an assessment of accuracy of proposed dimensionless form of Kostiakov model. However, it has been found that the cumulative infiltration estimated by nonlinear optimization technique are more accurate than those estimated by dimensionless form of Kostiakov equation and the graphical method. Therefore, the present paper proposes application of Generalized Reduced Gradient (GRG), a nonlinear optimization technique to estimate Kostiakov model parameters precisely rather than using dimensionless form of Kostiakov equation. Infiltration data of various types of soil have been considered in the present study for the generalization of the results.

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Section: Grg Optimization Techniquementioning

confidence: 99%

Assessment of Dimensionless Form of Kostiakov Model

Zakwan

2017

Aquademia: Water, Environment and Technology

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“…Over the past few years, Microsoft Excel has been used extensively in various engineering fields. Additionally, the GRG solver has been used to calculate infiltration equation parameters [ 84 , 89 , 90 ], parameter estimation of the non-linear Muskingum routing models [ 91 ], optimal unit hydrograph of watersheds [ 92 ], and rating curve, among others [ 3 , 93 ]. A GRG solver was also used to estimate intensity duration frequency (IDF) parameters by Zakwan [ 94 ].…”

Section: Methodsmentioning

confidence: 99%

Forecasting of stage-discharge in a non-perennial river using machine learning with gamma test

Vishwakarma

Kuriqi

Abed

et al. 2023

Heliyon

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“…GRG technique was applied by Bhattacharjya (2011) to obtain the optimal solution of groundwater flow inverse problem. Che et al (2014) found GRG solver as reliable as general algebraic modelling system (GAMS) to determine optimal unit hydrographs of watersheds. Muzzammil et al (2015) applied GRG technique to model the discharge rating curve.…”

Section: Grg Techniquementioning

confidence: 99%

Spreadsheet-based modelling of hysteresis-affected curves

Zakwan

2018

Appl Water Sci

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Design, operation and management of water resource projects are influenced by the amount of discharge passing through the stream. Discharge at the gauging site is generally estimated by developing single-valued simple rating curves. However, in case of unsteady flows, hysteresis affect is introduced in the stage discharge relationship and as such single-valued rating curves are no longer valid for such situations. The present paper presents a simple spreadsheet-based optimization approach for modelling the hysteresis-affected discharge rating curves. Generalized reduced gradient (GRG) technique has been reported as a reliable tool for handling optimization problems; therefore, in the present paper, it has been applied to estimate discharge for two sites with hysteresis affect based on Jones formula. Comparison of results shows that discharge estimated by GRG technique is as efficient as genetic algorithm and the goodness-of-fit criteria shows that the rating curves obtained by using Jones formula fit the observed data better than single-valued simple rating curves for both the sites considered in the present study. Application of spreadsheet-based GRG optimization technique could prove very helpful to the hydrometric offices.

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Determination of Optimal Unit Hydrographs and Green-Ampt Parameters for Watersheds

Cited by 8 publications

References 12 publications

Assessment of Dimensionless Form of Kostiakov Model

Assessment of Dimensionless Form of Kostiakov Model

Forecasting of stage-discharge in a non-perennial river using machine learning with gamma test

Spreadsheet-based modelling of hysteresis-affected curves

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