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GIS-based analytic hierarchy process (AHP) for soil erosion-prone areas mapping in the Bone Watershed, Gorontalo, Indonesia

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Abstract

The main problem faced by the developing countries globally in land management is soil erosion. This study maps an area of soil erosion prone in the Bone Watershed, Province Gorontalo, Indonesia, using topographical attributes sourced from a Digital Elevation Model with a spatial resolution of 30 m. The geographic information system methods are integrated with the analytic hierarchy process. This study considered ten topographic factors: elevation, slope, profile curvature, plan curvature, aspect, flow length to the nearest stream, stream power index, topographic wetness index, terrain ruggedness index, and sediment transport index. The model’s performance is assessed using the area under curve-receiver operating characteristic (AUC ROC) approach. According to the findings, slope and sediment transport index, as well as flow length to the nearest stream, had the most significant impact on soil erosion prone, with values of 0.202, 0.190, and 0.126, respectively. The overlaying maps of all topographic factors were divided into five zones: very low, low, moderate, high, and very high. High and very high zones were discovered in 22.7% and 0.3% of the entire research area, indicating that the area is at a severe rate of soil erosion. The AUC ROC value for validating mapping results with datasets is 75.4%, showing that the AHP-GIS model’s prediction is fair classification in mapping soil erosion-prone zones in the Bone Watershed. This research identifies significant soil erosion-prone zones in the hopes of assisting stakeholders and planners in developing a plan to reduce land degradation.

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Acknowledgements

The authors would like to thank the Department of Civil Engineering, Faculty of Engineering, Universitas Gorontalo for the partial financial support through an internal faculty grant. We also want to thank the anonymous reviewers for their constructive comments and express their gratitude to everyone who helped make this study a reality. The authors would also like to thank all the free database and satellite data providers whose data was downloaded from their web portal and used in this study.

Funding

The authors would like to thank the Department of Civil Engineering, Faculty of Engineering, Universitas Gorontalo for the partial financial support through an internal faculty grant.

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Contributions

MRO designed the model, and the computational framework and wrote the manuscript. AO analyzed the data and performed the calculations. RP drafted and designed the figures. MYUPO verified the analytical methods. All authors discussed the results and contributed to the final manuscript.

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Correspondence to Muhammad Ramdhan Olii.

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The authors declare that they have no known competing financial interests or personal relationships that could appear to have influenced the work described in this paper.

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Olii, M.R., Olii, A., Pakaya, R. et al. GIS-based analytic hierarchy process (AHP) for soil erosion-prone areas mapping in the Bone Watershed, Gorontalo, Indonesia. Environ Earth Sci 82, 225 (2023). https://doi.org/10.1007/s12665-023-10913-3

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  • DOI: https://doi.org/10.1007/s12665-023-10913-3

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