投影寻踪技术在城市河湖营养状态评价中的应用

Application of Projection Pursuit Technique in Assessment of Nutritional Status of Urban Rivers and Lakes

将投影寻踪技术运用到河湖营养状态评价中,对评价样本的各因素进行线性投影,把最优投影方向所对应的投影特征量作为评价依据,建立了河湖营养状态评价模型。选取总氮、总磷、高锰酸盐指数和叶绿素a4个因素作为评价指标,利用建立的模型对北京市河湖21个观测点的营养状态进行了评价。结果表明:投影寻踪模型能较好的对各河湖之间营养状态的比较进行评价。

The thesis applies the projection pursuit technology to the assessment of nutritional status of rivers and lakes,the linear projection to the factors of assessment samples,takes the projector feature corresponded with optimal projection direction as evaluating basis,establishes assessment model of nutritional status of the rivers and lakes.And selects the total nitrogen,total phosphorus,chemical oxygen demand and chlorophyll A as the assessment index,evaluates the nutritional status of 21 observation points of rivers and lakes in Beijing.The results show that projection pursuit technology has a better evaluation capacity for assessment of nutritional status of rivers and lakes.