Soil erosion and sediment delivery in a mountain catchment under scenarios of land use change using a spatially distributed numerical model
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Published:2012-05-08
Issue:5
Volume:16
Page:1321-1334
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Alatorre L. C.,Beguería S.,Lana-Renault N.,Navas A.,García-Ruiz J. M.
Abstract
Abstract. Soil erosion and sediment yield are strongly affected by land use/land cover (LULC). Spatially distributed erosion models are of great interest to assess the expected effect of LULC changes on soil erosion and sediment yield. However, they can only be applied if spatially distributed data is available for their calibration. In this study the soil erosion and sediment delivery model WATEM/SEDEM was applied to a small (2.84 km2) experimental catchment in the Central Spanish Pyrenees. Model calibration was performed based on a dataset of soil redistribution rates derived from point 137Cs inventories, allowing capture differences per land use in the main model parameters. Model calibration showed a good convergence to a global optimum in the parameter space, which was not possible to attain if only external (not spatially distributed) sediment yield data were available. Validation of the model results against seven years of recorded sediment yield at the catchment outlet was satisfactory. Two LULC scenarios were then modeled to reproduce land use at the beginning of the twentieth century and a hypothetic future scenario, and to compare the simulation results to the current LULC situation. The results show a reduction of about one order of magnitude in gross erosion (3180 to 350 Mg yr−1) and sediment delivery (11.2 to 1.2 Mg yr−1 ha−1) during the last decades as a result of the abandonment of traditional land uses (mostly agriculture) and subsequent vegetation recolonization. The simulation also allowed assessing differences in the sediment sources and sinks within the catchment.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
Reference69 articles.
1. Alatorre, L. C., Beguería, S., and García-Ruiz, J. M.: Regional scale modeling of hillslope sediment delivery: a case study in Barasona reservoir watershed (Spain) using WATEM/SEDEM, J. Hydrol., 391, 109–123, 2010. 2. Almorox, J., De Antonio, R., Saa, A., Cruz, Díaz M., and Gasco, J. M.: Métodos de estimación de la erosión hídrica, Ed. Agrícola Española, Madrid, España, 152 pp., 1994. 3. Angulo-Martínez M. and Beguería, S.: Estimating rainfall erosivity from daily precipitation records: a comparison between methods in the Ebro Basin (NE Spain), J. Hydrol., 379, 111–121, 2009. 4. Bathurst, J. C., Moretti, G., El-Hames, A., Beguería, S., and García-Ruiz, J. M.: Modelling the impact of forest loss on shallow landslide sediment yield, Ijuez river catchment, Spanish Pyrenees, Hydrol. Earth Syst. Sci., 11, 569–583, https://doi.org/10.5194/hess-11-569-2007, 2007. 5. Beguería, S., López-Moreno, J. I., Gómez-Villar, A., Rubio, V., Lana-Renault, N., and García-Ruiz, J. M.: Fluvial adjustments to soil erosion and plant cover changes in the Central Spanish Pyrenees, Geografiska Annaler, 88A, 177–186, 2006.
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