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Water erosion hazard map** using analytic hierarchy process (AHP) and fuzzy logic modeling: a case study of the Chaffar Watershed (Southeastern Tunisia)

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Abstract

Water erosion is one of the most severe environmental problems, especially in arid and semi-arid regions. It is responsible for soil loss and degradation of ecosystems. This study is interested in map** water erosion hazard (WEH) in the Chaffar Watershed (Southeastern Tunisia), using analytical hierarchy process (AHP) and fuzzy logic modeling. The importance of major factors affecting erosion (field slope, soil lithology, vegetation index, land use, and rainfall) was inspired from a review of the literature, field investigations, and experts’ knowledge. Water erosion conditioning factors and their spatial distributions were evaluated in a geographic information system (GIS). Water erosion hazard maps, simulated by AHP and fuzzy logic, were validated by field observations and Sentinel-2 satellite images. The resulting erosion hazard maps were found to be compatible with the results derived from the Sentinel-2 images. The receiver operating characteristic (ROC) curve validation result shows that, compared to the AHP model (AUC=84.7%), the fuzzy logic model (AUC =90.5%) predicted slightly better water erosion in the Chaffar Watershed. Generally, a moderate hazard of water erosion was found throughout the study watershed. The area characterized by a high to very high risk of water erosion was estimated to be 25% and 32% using fuzzy logic and AHP methods respectively. Highly eroded areas, which are quite limited, require immediate action.

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Acknowledgements

The authors gratefully acknowledge the Regional Office of the Ministry of Agriculture (CRDA) of Sfax for their contribution to the fieldwork.

Funding

This work was funded by the Tunisian Ministry of High Education and Scientific Research.

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Authors and Affiliations

  1. Laboratory of Modeling of Geological and Hydrological Systems (GEOMODELE (LR16ES17)), Faculty of Sciences, University of Sfax, 1171, 3000, Sfax, BP, Tunisia

    Nouha Neji & Habib Abida

  2. Water and Soil Conservation Department, Regional Office of the Ministry of Agriculture CRDA of Sfax, 3018, Sfax, Tunisia

    Rami Ben Ayed

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  1. Nouha Neji
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Correspondence to Nouha Neji.

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Neji, N., Ayed, R.B. & Abida, H. Water erosion hazard map** using analytic hierarchy process (AHP) and fuzzy logic modeling: a case study of the Chaffar Watershed (Southeastern Tunisia). Arab J Geosci 14, 1208 (2021). https://doi.org/10.1007/s12517-021-07602-5

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