Based On The System Dynamics About Researching Water Environment Bearing Capacity On The Downs Tream Of The Yellow River

With the rapid development of population,economy and the increasing of human activities,the destruction of water environment and the waste of water resources have become the urgent problems in the world.In recent years,because of China's rapid economic development and the extensive economic growth mode,water pollution was increased and water resources was wasted excessively,and the harmonious society and the water environment,the water resources have formed a new type of contradiction.There is a complicated natural condition in the Yellow River.The situation of the Yellow River is very special,such as less water and more sand,flood threat,serious pollution.Their factors restrict seriously the sustainable development of the economy and society in the basin and related areas.The lower reaches of the Yellow River have an important influence on the economic and social development of the two provinces of North China,especially Henan,Shandong.Relyed on the natural science research project of Henan Provincial Education Department?Influence of Water and Sediment Regulation on Water Environment Carrying Capacity of the Lower Reaches of the Yellow River?,combined with the social economy,population,water resources in the lower reaches of the Yellow River,water environment carrying capacity in the lower reaches of the Yellow River is studied.The research could play an active role in coordinating the sustainable development of the economy and various natural resources in the lower reaches of the Yellow River.The paper is based on the sustainable development of environment and economy society as the main research objective,and the water environment carrying capacity in the lower reaches of the Yellow River is researched and analysised.The theory of the water environmental carrying capacity is combined with river ecological water demand and water environmental capacity,which establishes the research of theory system of water environment bearing capacity in the lower reaches of the Yellow River.It builds the index system of WECC using analytic hierarchy process(AHP)by means of the carrying objects(such as population,economy,water pollution,water resources),starting from the carrying objects media of WECC(water quantity and quality).Finally,it builds the WECC model by system dynamics,and puts forward effective solutions,and calculates the water environment carrying capacity of the lower reaches of the Yellow River river,and improves water environmental carrying capacity in the lower reaches of the Yellow River.The main results of the study are as follows:(1)The concept of water environmental carrying capacity was summarized.The connotation of water environmental carrying capacity was improved.And the index system of water environmental carrying capacity was established,and the weight of index system was determined by analytic hierarchy process(AHP)method.(2)Starting from the water ecology and water environment,and the coordinated development of environment and economy as the goal,it studys water environment bearing capacity in the lower reaches of the Yellow River.It calculates and analyses ecological water demand and water environmental capacity in the lower reaches of the Yellow River,and analysing the changes of water quality in the lower reaches of the Yellow River.(3)The water environment carrying capacity based on system dynamics is applied in the lower reaches of the Yellow River River,and the calculation of water environment carrying capacity of the seven schemes is carried out in the lower reaches of the Yellow River River,and the suggestions for development of the Yellow River's lower reaches are given.