Rainfall-runoff modelling of railway embankment steep slopes

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Sajjan, Asim Krishna
Gyasi-Agyei, Yeboah
Sharma, Raj Hari
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2013
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Abstract

A distributed 1D rainfall-runoff model is presented. It consists of the Saint Venant continuity and momentum equations for overland flow and a modified Green-Ampt model for the infiltration on railway embankment steep slopes. The model is applied to adjacent 10-m-wide erosion control experimental plots with different percentages of grass cover. A relationship between the 2-day antecedent rainfall and initial moisture content was established and used to predict the saturated hydraulic conductivity (Ks). Average values of Ks for 0, 50 and 100% grass cover were found to be 0.1, 1.19 and 2.56 mm/h, respectively. For the majority of cases, the model simulated runoff with acceptable accuracy, 68% having Nash-Sutcliffe efficiency (NSE) values above 0.50. The average NSE value varied between 0.60 and 0.80, with 0% grass-covered plots yielding the highest values. As expected, the runoff volume decreased with increasing percentage of grass cover. © 2013 Copyright 2013 IAHS Press.

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Hydrological Sciences Journal

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58

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5

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Physical geography and environmental geoscience

Civil engineering

Environmental engineering

Science & Technology

Physical Sciences

Water Resources

rainfall

runoff

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Sajjan, AK; Gyasi-Agyei, Y; Sharma, RH, Rainfall-runoff modelling of railway embankment steep slopes, Hydrological Sciences Journal, 2013, 58 (5), pp. 1162-1176

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