Results 141 to 150 of about 622 (180)

The Green–Ampt limit with reference to infiltration coefficients

Water Resources Research, 2012
Recent progress with an analytic nonlinear model has provided the exact infiltration coefficients for realistic soil behaviors with nonsingular hydraulic functions, as well as their exact delta‐function diffusivity limits. After some correction and reinterpretation of the approximate analytical method, the exactly solvable model validates some ...
D. Triadis, P. Broadbridge
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Applications of the Green-Ampt Method across Scales

World Environmental and Water Resources Congress 2014, 2014
The Green-Ampt method has been widely used for simulating infiltration and rainfall-runoff processes in various hydrologic models across spatial scales ranging from small laboratory scales to large field and watershed scales. A fundamental question is this: how do such spatial scales affect the applicability of the Green-Ampt method?
Xuefeng Chu, Noah Habtezion
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Drainage to a water table analysed by the Green-Ampt approach

Journal of Hydrology, 1976
By means of the Green-Ampt analysis, it is shown that the drainage from an initially saturated column of porous material after the water table is suddenly lowered to a given level from the surface on which infiltration is maintained at a rate q during the drainage, may be described to a good approximation by the equation: 1-Q′Q′∞=exp[-(F0-q)tQ′∞]
E.G. Youngs, S. Aggelides
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Precipitation Distributions and Green‐Ampt Runoff

Journal of Irrigation and Drainage Engineering, 1991
One‐hundred‐year and 10‐year storm runoff volumes and peak discharges were computed with a Green‐Ampt infiltration model and the Soil Conservation Service's (SCS) TR‐20 hydrograph model. The results for six different standard design storm temporal distributions were compared with predictions made with the U.S.
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Determination of Wetting Front Suction in the Green‐Ampt Equation

Soil Science Society of America Journal, 1974
Abstract Interest in the Green‐Ampt equation to predict infiltration rates into uniform and layered soils has increased in recent years. The work reported here is a study of the theoretical justification of determining the suction (at the wetting front) parameter in the equation from the hydraulic conductivity versus capillary suction
R. G. Mein, D. A. Farrell
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Green‐Ampt—Model to Predict Surge Irrigation Phenomena

Journal of Irrigation and Drainage Engineering, 1987
A significant advantage attributed to surge flow irrigation is that for the same volume of water applied the stream will advance farther along the furrow than with continuous flow. Where this advance phenomenon exists, the reduction in runoff and deep percolation will improve uniformity and application efficiency.
M. A. Killen, D. C. Slack
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A Green‐Ampt Model of infiltration in a cracked soil

Water Resources Research, 1984
The motion of the wetting front in a two‐dimensional Green‐Ampt model of infiltration into a soil containing regularly spaced water‐filled vertical cracks is traced using a stepwise numerical procedure which progressively solves an integral equation for the velocity at points on the front at each time step.
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Application of the Green–Ampt model for infiltration into layered soils

Journal of Hydrology, 2015
Summary Using the Green–Ampt model for layered soils, a theoretical method is proposed to estimate the layers’ hydraulic parameters based on infiltration test data. To evaluate the proposed method and to investigate the effect of the layers’ permeability on infiltration, constant head infiltration tests were conducted on six different two-layered ...
Jahanshir Mohammadzadeh-Habili, Manouchehr Heidarpour   +1 more
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Explicit infiltration equations based on the Green–Ampt model

Canadian Journal of Civil Engineering, 1987
The Green–Ampt infiltration equations are based on physical parameters of the soil that can be either measured or calculated reasonably easily. However, neither the infiltration rate equation nor the cumulative depth of infiltration equation is in a form that can be used easily in hydrologic modeling, as both equations are in an implicit form when ...
K. P. Thooyamani, D. I. Norum
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Green‐ampt Infiltration Parameters from Soils Data

Journal of Hydraulic Engineering, 1983
The analysis of approx 5,000 soil horizons indicated that Green and Ampt parameters (effective porosity, wetting front capillary pressure, and hydraulic conductivity) could not be developed based on phases of soil order or suborder. However, sets of average parameters are developed based on soil horizon or soil texture class, or both.
Walter J. Rawls, Donald L. Brakensiek, Norman Miller   +2 more
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