Application of Projection Pursuit Method in Ecosystem Health Assessment of Luanhe River Basin
In view of increasingly severe ecosystem health problem in Luanhe River Basin,the ecosystem health assessment index system of Luanhe River Basin is established based on pressure-state-response (PSR) model.The projection pursuit method is used to change high-dimensional data indexes into low-dimensional subspace and the best projection direction is obtained based on real coding accelerating genetic algorithm optimization in model.The level evaluation model of projection pursuit is established to evaluate the ecosystem health of four cities in Luanhe River Basin in 2012.The evaluation results show that the corresponding level value of Chengde,Qinhuangdao,Tangshan and Xilin Gol is 4.58,3.77,2.83 and 2.69 respectively,which imply that they are in a state of very healthy,healthy,sub healthy and sub healthy respectively.At the same time,based on evaluation index system,the existing problems of ecological system in four cities are analyzed.
ecosystem health assessmentevaluation indexaccelerating genetic algorithmprojection pursuitLuanhe River Basin
国家科技期刊平台
NSTL
万方数据
维普
