Study On Dynamic Modeling And Control Of Eutrophication In The Upper Reaches Of Wujiang River

In recent years,with economic growth,the increase of population,more and more rivers,lakes,reservoirs and other water eutrophication problems appeared in different degrees.Especially in the human activity is more dense area and rivers,lakes,reservoirs and other water flow rate is relatively slow,the eutrophication problem is more serious.One of the most important Wujiang as a tributary of the upper reaches of the Yangtze River,China across northern Guizhou province and Southeast Chongqing,upstream of Wujiang River Basin contains abundant water resources,mineral resources,people built a large hydropower station in Wujiang River Basin,reservoir and other facilities.With frequent human activities upstream of Wujiang River Basin,large amounts of untreated industrial waste Water discharge,cage fish,wanton dumping of hazardous waste residents and other problems arise,causing water eutrophication problem more and more serious,nearby residents can not properly use the water of life,life and production activities has been a serious threat to the surrounding residents normal,the upper reaches of Wujiang serious eutrophication will aggravate the downstream area of soil salinization.In short,the upper reaches of Wujiang water environment is directly related to the Wujiang basin living on both sides of the level of the quality of living environment.In this paper,we selected the upper reaches of the Wujiang River as the research object,and studied the following aspects:(1)Introducing the definition,cause,characteristics and hazards of eutrophication;(2)Describing and constructing the eutrophication investigation and evaluation index(3)Introducing the investigation of eutrophication in the upper reaches of the Wujiang River,combing the current research results on such issues in the upstream of the Wujiang River;(4)Studying and analyzing the eutrophication of the upper reaches of the Wujiang River and establishing(5)According to the results of dynamic model analysis,the main conclusions of eutrophication of water body are obtained,and some constructive measures and suggestions are given to deal with the eutrophication of the upper reaches of Wujiang River.In this study,mainly based on dynamic modeling as the foundation,first discussed with eutrophication model of impulsive control,this model is considered into the pulse of nutrients and dredging.Not only the uniformly completely bounded solutions of the eutrophication model with impulsive control are obtained,but also the globally asymptotically stable and uniformly persistent conditions for the extinction boundary periodic solution of the model are obtained.Secondly,considering the characteristic of population hibernation,a model with population hibernation and pulse effect is constructed.It is proved that the solution of this model is uniformly and ultimately bounded.The condition of global asymptotic stability and the permanent condition of the periodic solution of population extinction for eutrophication dynamics model with hibernation characteristics are obtained.It provides a reliable theoretical basis and support for the management of water eutrophication.