Effect of Rainfall Intensity on Infiltration into Partly Saturated Slopes
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This paper describes the development of a model to analyse the rate of infiltration and run-off experienced by a partly saturated soil slope during rainfall. The paper first reviews some of the most popular infiltration models used in geotechnical analysis, and highlights some of the problems associated with their application. One particular model, the Horton Equation is extended to include rainfall intensity directly in its formulation. The new model is shown to predict infiltration responses, which agree with field measurements. In the final section the influence of the rainfall intensity and pattern of rainfall (variation of rainfall intensity) on the infiltration response of a soil is investigated using the new model.
KeywordsWater flow Unsaturated soil slopes Rainfall pattern Runoff Cumulative infiltration
This research forms part of a project funded by Iarnród Éireann. The authors wish to thank Mr. Brian Garvey, Chief Civil Engineer with Iarnród Éireann for technical and financial assistance received. The first author was the recipient of a Geotechnical Trust Fund award from the Geotechnical Society of Ireland.
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