6533b82afe1ef96bd128c307
RESEARCH PRODUCT
Analytical solution of kinematic wave time of concentration for overland flow under green-ampt infiltration
Vijay P. SinghGiorgio Baiamontesubject
2300Sorptivity0208 environmental biotechnologyGreen-Ampt infiltration model; Hillslope hydrology; Kinematic wave equations; 2300; Environmental Chemistry; Water Science and Technology; Civil and Structural Engineering02 engineering and technologyMechanicsGreen-Ampt infiltration modelHillslope hydrologyPhysics::Geophysics020801 environmental engineeringKinematic wave equationKinematic waveInfiltration (hydrology)Error analysisImpervious surfaceEnvironmental ChemistrySettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliGeotechnical engineeringSurface runoffTime of concentrationGeologyGeneral Environmental ScienceWater Science and TechnologyCivil and Structural Engineeringdescription
In this paper the well-known kinematic wave equation for computing the time of concentration for impervious surfaces has been extended to the case of pervious hillslopes, accounting for infiltration. An analytical solution for the time of concentration for overland flow on a rectangular plane surface is derived using the kinematic wave equation under the Green-Ampt infiltration. The relative time of concentration is defined as the ratio between the time of concentration of an infiltrating plane and the soil sorptivity time scale, depending on the normalized rainfall intensity and a parameter synthesizing the soil and hillslope characteristics. It is shown that for a more complex case (corresponding to the second domain of solution domain), the time of concentration can also be estimated by two simplified approximate procedures. An error analysis for the time of concentration computed for constant and time-varying infiltration is carried out. Finally, for a hillslope under the Green-Ampt infiltration, the time of concentration obtained by the kinematic wave equation is compared with that computed by a nonlinear storage model. An application of the proposed method for two different soils is shown and discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-12-14 |