Modeling Grass-Cover Effects on Soil Erosion on Railway Embankment Steep Slopes
Publication: Journal of Hydrologic Engineering
Volume 20, Issue 9
Abstract
Railway formation (embankments and cuttings) in Queensland are experiencing increased maintenance costs due to rainfall induced erosion and sedimentation problems. The erosion problems can be reduced by establishing grass cover on the steep slopes (batters). The objective of the research reported in this paper was to develop a continuous rainfall-runoff-soil erosion model to investigate grass cover effects on runoff and soil loss on railway formation steep slopes. It utilizes the Saint Venant continuity and momentum equations for overland flow, and a modified Green-Ampt model for infiltration on steep slopes. The erosion component of the model consists of two different methods, based on (1) the modified universal soil loss equation, and (2) steep slope erosion dynamics. The efficiency of the model was evaluated by the percentage error and the Nash-Sutcliffe efficiency values. Field trials data gathered from 10-m wide sections with different grass cover percentages were used to calibrate the one-dimensional distributed rainfall-runoff model. Rainfall and runoff were monitored at 1-min intervals while the soil loss data were collected at different sampling intervals. The model has successfully predicted runoff and soil loss from the plots for the majority of the cases, with Nash-Sutcliffe efficiency values varying between 0.43 and 0.99 for 0% grass cover plots, 0.06 and 0.97 for 50% grass cover plots, and to 0.94 for 100% grass cover plots. The percentage error values for soil loss vary from 5 to 58% for 0% grass cover plots for the steep slope erosion dynamics method and 4–59% for the modified universal soil loss equation-based method. For 50% grass cover plots, the percentage error values vary from 2 to 160 and 18 to 86%, for the steep slope erosion dynamics and modified universal soil loss equation-based methods, respectively. With the aid of an antecedent moisture parameter which varies with grass cover percentage, continuous simulation of runoff and erosion can be carried out, using either long records of observed fine timescale rainfall or that derived from a stochastic rainfall model.
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Acknowledgments
The writers are thankful to Mr. Vince Legge for helping with the field data collection. Also the first writer is grateful to Central Queensland (CQ) University, Australia, and its Center for Railway Engineering (CRE) for financial support.
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Published In
Journal of Hydrologic Engineering
Volume 20 • Issue 9 • September 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 29, 2013
Accepted: Oct 15, 2014
Published online: Dec 11, 2014
Discussion open until: May 11, 2015
Published in print: Sep 1, 2015
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