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Evaluation of watershed soil erosion hazard using combination weight and GIS: a case study from eroded soil in Southern China

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Abstract

Soil erosion is a type of land degradation caused by the interactive interaction of numerous factors, such as natural and socioeconomic conditions of a particular watershed. In this study, a comprehensive integrated methodology was used to evaluate the water erosion hazard in the Zhuxi watershed in Southern China, which is greatly affected by eroded soil. Ten indicators were selected, and a thematic layer map was generated for each indicator using Geographic Information System (GIS). The weight of each evaluation indicator was determined by combining analytic hierarchy process (AHP) with entropy method. Results show that the east and west sections of the Zhuxi watershed have very low and low grades of soil erosion hazards, respectively, and the middle part has the highest hazard. More than 60% of the area has high erosion hazard (moderate to very high). The intensity of soil erosion is lower than its hazard level, especially in high-grade hazard. The obtained results for erosion hazard level can be used to develop conservation strategies for the Zhuxi watershed. This study evaluates soil erosion hazard and offers reference for soil erosion control.

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Acknowledgements

This study was funded by the Guangdong province philosophy and social sciences planning project of China (GD18XGL55), the Guangdong Province education department youth innovation talents projects of China (2015KQNCX148), the national research–development support plan projects of China (2017YFC05054), and Shaoguan City science and technology project (2018sn055). The authors gratefully acknowledge the Associate Editor and the anonymous reviewers for providing their constructive comments and suggestions, which improved the quality of this manuscript significantly. We would like to thank Doctor Yang for the constructive comments on revised manuscript.

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Correspondence to Shifa Chen.

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Chen, S., Liu, W., Bai, Y. et al. Evaluation of watershed soil erosion hazard using combination weight and GIS: a case study from eroded soil in Southern China. Nat Hazards 109, 1603–1628 (2021). https://doi.org/10.1007/s11069-021-04891-7

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  • DOI: https://doi.org/10.1007/s11069-021-04891-7

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