基于主成分分析的糯扎渡水电站弃渣场土壤流失量影响因素研究

为研究糯扎渡水电站弃渣场坡面土壤流失规律,选取移民安置工程中未采取拦挡及植被恢复措施的22个弃渣场坡面为研究对象,对土壤流失量及其影响因素进行研究。结果表明,弃渣场坡面土壤流失量随着坡度及坡长的增加分别呈现二次函数及对数函数增长规律;土壤流失量随着土壤容重的增加呈线性增加,而与土壤总孔隙度及土壤非毛管孔隙度的增加均呈现对数函数降低,与土壤的毛管孔隙度呈不规律性。结合相关分析,筛选出7个显著及极显著影响土壤流失量的因子,通过主成分分析,得到土壤流失量参数α及影响土壤流失量各因子的综合参数β,并构建了回归模型,为土壤流失量的预测提供理论依据。

Research on the Influencing Factors of Soil Loss in Dumping Sites of Nuozhadu Hydropower Station Based on Principal Component Analysis

In order to study the characteristics of soil loss on the slope of dumping sites in Nuozhadu Hydropower Station,22 dumping sites without treatment measures of blocking and vegetation restoration are selected as research objects to study the amount of soil loss and its influencing factors.The results show that,(a)the amount of soil loss on the slope of dumping sites shows a quadratic function growth with the increase of slope degree and a logarithmic growth with the increase of slope length;and(b)the amount of soil loss increases linearly with the increase of soil bulk density,and decreases logarithmically with the increases of soil total porosity and non-capillary porosity respectively,but has no obvious correlation relationship with capillary porosity.Based on the correlation analyses,seven factors that have extremely significant or significant effect on soil loss are selected,and the parameters of soil loss(α)and the comprehensive parameter of soil loss factors(β)are obtained by principal component analysis.The linear regression model between parameterαandβis built,which will provides a theoretical basis for the prediction of soil loss.