Cloud Model-Based Assessment of Benggang Erosion Hazard in the Red Soil Area of South China from a Production-Living-Ecology Space Perspective
Benggang is one of the most serious forms of soil erosion in the red soil areas of southern China.Since there exists spatial differences in the types and sizes of Benggang hazards,approaches to Benggang hazard assessment and risk control practices should be targeted and time-sensitive,and require more spatial accuracy of assessment results.In this study,it demonstrated a proper approach of hazard assessment of Benggang in Guanqiao town,Anxi county,Fujian province,a red soil area in southern China.A cloud model-based assessment model of Benggang hazard was built from a production-living-ecology space perspective,and then it was justified by a case study of 2020 for the town,followed by feasible countermeasures to the Benggang occurrences to be proposed.(1)Economic density,population density,and the proportion of the Benggang area to the area of each village in Guanqiao town were dominant factors,with weights of 0.278,0.164,and 0.148,respectively,suggesting that the economic and social factors and the direct influencing factors of Benggang collectively regulated hazard level.(2)The Benggang hazards was characterized spatially by a high clustering in the central and northeastern part of the town,but a sparse formation in the surrounding area.It caused the highest harm to productive-space,followed by ecology-pace,and the least to living-space.It is advisable to address the prevention of the Benggang hazards in the central and northeastern part,especially for the production-space,if any in a risk management system.(3)As comparing the evaluation results based on the cloud model and a non-applied cloud model/regular model,the spatial distribution trends of the very high hazard Ⅴ zones were almost identical for the both models,but the cloud model-based assessment produced more refined and detailed output,revealing the overall pattern of the Benggang hazards in the study areas.This study not only enriches methodology for evaluating Benggang hazards but also offers suggestions for an proper Benggang management policy.
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