Analysis Of Water Environmental Evolution In The Meihe River Section Of Ganjiang River

At present,the problem of water environment in our country has become more serious.In recent years,environmental problems have aroused the attention of the government.Especially since twenty-first Century,with the rapid development of social economy,the negative effect it brings to the environment variety.This includes the river.The lake ecosystem destruction,it is a direct result of increasing deterioration of water environment.The tail section of Ganjiang River tributary more,the basin area is relatively broad.Because of the larger population living along the border,near some factories exist,resulting in water quality of drinking water exceed the standard tail section of Ganjiang River,deterioration.This thesis is to study the evolution of water environment in tail section of Ganjiang River,using the MIKE21 model in MIKE software to establish the water power module Hydrodynamics(HD),using the measured flow for each hydrological stations within the reach of Ganjiang River,the water level data,the hydrodynamic model of Ganjiang River Basin from Nanchang delta to Poyang Lake into the section of Hukou hydrological station then the coupling;water quality module of MIKE21 model,study on the law of diffusion index and the moving area of the main pollutants COD and NH3-N simulation analysis,so as to provide technical support for water environment protection and ecological construction of the Ganjiang River Basin.Through this analysis the following conclusions are obtained by using principal component analysis method,factor of main pollutants mainly calculate pollutant index of Ganjiang River is COD and ammonia nitrogen pollutants.According to the two year old Gan River environment,changes by the cluster analysis method of water quality in August and September to be inferior to 4-7 months,because during this period,the Yangtze River water from Poyang Lake Poyang Lake,the water level rose,the tail section of Ganjiang River water has caused the backwater effect.And 1997 to different years of the water pollution situation in 2015 between the comparison shows that the 2000-2004?2007 water for the light pollution of water quality,2005?2006?2008?2009 years of good water quality,better water quality in other years.Closely linked with the economic development of Ganjiang River river river water quality change and the change of natural environment,population and the point source pollution and traffic is the main driving factors.