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    多模型超参数与优化与指标优选的人为水土流失风险预警模型构建及评价

    Construction and Evaluation of an Artificial Soil Erosion Risk Early Warning Model with Multi-Model Hyperparameter Optimization and Metric Selection

    • 摘要: 人为水土流失是水土流失的重要形式,肇庆市位于粤港澳大湾区,人为活动较为频繁,科学评估区域重点对象的人为水土流失风险等级,可为水行政主管部门实施精准监管提供科学依据。/t/n以肇庆市2024年全区人为水土流失扰动图斑为研究对象,选取扰动地块面积、周长、形状指数、坡比、平均坡度、高差、高程均值、与河流道路距离等关键指标构建样本数据集,并基于随机森林(RF)、决策树(DT)、逻辑回归(LR)和支持向量机(SVM)模型进行训练与比较。/t/n随机森林模型在测试集上表现最优,准确率达89.4%,宏F1分数为0.883,Kappa系数为0.834,显示出良好的分类性能和泛化能力。/t/n构建的多参数指标体系结合机器学习方法,可实现人为水土流失风险的准确、高效预警,为区域水土流失监管提供可靠技术支撑。

       

      Abstract: Objective Human soil erosion is an important form of soil and water loss. Zhaoqing City is located in the Guangdong Hong Kong Macao Greater Bay Area, with frequent human activities. Scientific assessment of the risk level of human soil erosion of key objects in the region can provide scientific basis for water administrative departments to implement precise supervision. Methods Taking the human induced soil erosion disturbance map of Zhaoqing City in 2024 as the research object, a sample dataset was constructed based on key indicators such as disturbance plot area, perimeter, shape index, slope ratio, average slope, height difference, elevation mean, and distance from rivers and roads. Random forest (RF), decision tree (DT), logistic regression (LR), and support vector machine (SVM) models were trained and compared.Results The random forest model performed the best on the test set, with an accuracy of 89.4%, a macro F1 score of 0.883, and a Kappa coefficient of 0.834, demonstrating good classification performance and generalization ability. Conclusion The constructed multi parameter indicator system

       

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