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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/hessd-12-12947-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
15 Dec 2015
Review status
This discussion paper is under review for the journal Hydrology and Earth System Sciences (HESS).
The impact of road and railway embankments on runoff and soil erosion in eastern Spain
P. Pereira1, A. Gimeìnez-Morera2, A. Novara3, S. Keesstra4, A. Jordán5, R. E. Masto6, E. Brevik7, C. Azorin-Molina8, and A. Cerdà9 1Environmental Management Centre, Mykolas Romeris University, Ateities g. 20, 08303 Vilnius, Lithuania
2Departamento de Economía y Ciencias Sociales, Escuela politeìcnica superior de Alcoy, Universidad Politeìcnica de Valencia, Paseo del Viaducto, 1 03801 Alcoy, Alicante, Spain
3Department of Scienze Agrarie e Forestali, University of Palermo, viale delle scienze, Italy
4Soil Physics and Land Management Group, Wageningen University, Droevendaalsesteeg 4, 6708PB Wageningen, the Netherlands
5MED_Soil Research Group, Dep. of Crystallography, Mineralogy and Agricultural Chemistry, University of Seville, Sevilla, Spain
6Environmental Management Division, CSIR – Central Institute of Mining and Fuel Research (Digwadih Campus), Dhanbad, 828108, India
7Department of Natural Sciences, Dickinson State University, Dickinson, ND, USA
8Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (IPE-CSIC), Departamento de Procesos Geoambientales y Cambio Global, Zaragoza, Spain
9Soil Erosion and Degradation Research Group, Department of Geography, University of Valencia, Valencia, Spain
Abstract. Road and railway infrastructure increased in the Mediterranean region during the last three decades. This included the building of embankments, which are assumed to be a~large source of sediments and runoff. However, little is known about soil erosion rates, the factors that control them, and the processes that contribute to detachment, transport and deposition of sediments from road and railway embankments. The objective of this study was therefore to assess the impacts of road and railway embankments as a source of sediment and water, and compare them to other land use types (citrus plantations and shrublands) representative of the Cànyoles watershed to evaluate the importance of road embankments as a~source of water and sediment under high magnitude low frequency rainfall events. Sixty rainfall experiments (1 m2 plots; 60 min duration; 78 mm h−1 rainfall intensity) were carried out on these land use types: 20 on two railway embankments (10 + 10), 20 on two road embankments (10 + 10), and 10 on citrus and 10 on shrubland. Road and railway embankments were characterized by bare soils with low organic matter and high bulk density. Erosion processes were more active in road, railway and citrus plots, and null in the shrublands. The non-sustainable soil erosion rates of 3 Mg ha−1 y−1 measured on the road embankments were due to the efficient runoff connectivity plus low infiltration rates within the plot as the runoff took less than one minute to reach the runoff outlet. Road and railway embankments are both an active source of sediments and runoff, and soil erosion control strategies must be applied. The citrus plantations also act as a~source of water and sediments (1.5 Mg ha−1 y−1), while shrublands are sediment sinks, as no overland flow was observed due to the high infiltration rates.

Citation: Pereira, P., Gimeìnez-Morera, A., Novara, A., Keesstra, S., Jordán, A., Masto, R. E., Brevik, E., Azorin-Molina, C., and Cerdà, A.: The impact of road and railway embankments on runoff and soil erosion in eastern Spain, Hydrol. Earth Syst. Sci. Discuss., 12, 12947-12985, doi:10.5194/hessd-12-12947-2015, 2015.
P. Pereira et al.
P. Pereira et al.
P. Pereira et al.

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Short summary
Road and railway embankments contribute importantly to soil and water losses in South-Eastern Spain. Comparing with other land uses as scrubland and citrus plantations, road and railway embankments increased exponentially the amount of sediment transport and runoff. Restoration programs are needed to decrease soil and water losses in these man-made infrastructures.
Road and railway embankments contribute importantly to soil and water losses in South-Eastern...
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