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Assessment of soil erosion risk using SWAT model

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Abstract

Soil erosion is one of the most serious land degradation problems and the primary environmental issue in Mediterranean regions. Estimation of soil erosion loss in these regions is often difficult due to the complex interplay of many factors such as climate, land uses, topography, and human activities. The purpose of this study is to apply the Soil and Water Assessment Tool (SWAT) model to predict surface runoff generation patterns and soil erosion hazard and to prioritize most degraded sub-catchment in order to adopt the appropriate management intervention. The study area is the Sarrath river catchment (1,491 km2), north of Tunisia. Based on the estimated soil loss rates, the catchment was divided into four priority categories for conservation intervention. Results showed that a larger part of the watershed (90 %) fell under low and moderate soil erosion risk and only 10 % of the watershed was vulnerable to soil erosion with an estimated sediment loss exceeding 10 t ha−1 year−1. Results indicated that spatial differences in erosion rates within the Sarrath catchment are mainly caused by differences in land cover type and gradient slope. Application of the SWAT model demonstrated that the model provides a useful tool to predict surface runoff and soil erosion hazard and can successfully be used for prioritization of vulnerable areas over semi-arid catchments.

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Acknowledgments

The authors wish to express their gratitude to the Soil and Water Land Agriculture Authority for supplying land use database.

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Authors and Affiliations

  1. Laboratory of Remote Sensing and Information System for spatial reference, National School of Engineers of Tunis, BP37, Tunis Belvedere, 1002, Tunisia

    Manel Mosbahi & Mohamed Rached Boussema

  2. Center for Water Research and Technologies, BP 273, Soliman, 8020, Tunisia

    Sihem Benabdallah

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  1. Manel Mosbahi
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  2. Sihem Benabdallah
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  3. Mohamed Rached Boussema
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Correspondence to Sihem Benabdallah.

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Mosbahi, M., Benabdallah, S. & Boussema, M.R. Assessment of soil erosion risk using SWAT model. Arab J Geosci 6, 4011–4019 (2013). https://doi.org/10.1007/s12517-012-0658-7

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  • DOI: https://doi.org/10.1007/s12517-012-0658-7

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