Shanxi Section Of Weihe River Sediment Releasing Regularity And Its Influence On Water Quality Research

Before the 1990 s,the extensive economic growth mode in our country didn't take the pollution to the environment,make a lot of sewage into the river pollution.And the Weihe river as the largest tributary of the Yellow River water system,at the time people called the guanzhong "sewer",is one of the main tributaries of the Yellow River pollution.Although" The 12th five-year plan "since the water quality was improved,but before the deposit on the sediment of the pollutants under certain conditions will be released into the water,the inside sources of pollutants of water body.In this paper,the Shanxi section of weihe river set up eight sample point to it's physical and chemical properties,interstitial water sediments and the river water quality analysis,it is concluded that the wei river water quality present situation and the relationship of pollutants in the medium,reflect the pollution of sediment will indirectly affect the river water quality.Through the analysis of the simulation of pollutants in sediment release,release regularity of sediment in natural state and various environmental factors on the influence of sediment release,provided the scientific basis for water quality safety.The main research content is as follows:1.In Shanxi section of weihe river(level period)in April and September(altogether)in sediments and pollutants in the water for testing,the upstream sediment and river water quality is better than that of the downstream sediment and water quality,water quality in April and mud quality in water quality and argillaceous in September.And total nitrogen and COD in water pollution is serious basic is in worse V water,ammonia nitrogen pollution is serious in September,before many into the wei river trunk stream(D5)and many other import on the weihe river(D7)points beyond the V class water quality standard,the total phosphorus content is relatively small,but the total phosphorus content in the downstream belongs to V class quality,weihe river before many import(D5)in September,even beyond the V class water standard.2.Through the study of the laboratory static simulation of Shaanxi section of weihe river sediment experiment:Shaanxi section of weihe river sediment of total nitrogen in water absorbing state,and the total phosphorus in the sediment at each sampling point and the release of the COD absorbing state.This mainly by the overlying water pollutants concentration,sediment physical and chemical properties and the influence of the dissolved oxygen content in water-sediment system.3.From the various pollution sediment nutrient release experiment and overlying water concentration on the influence of sediment release experiments can be concluded that sediment-nutrients in the water system is controlled by the diffusion behavior of various kinds of compounds in the water saturation threshold.Pollutant concentration gradient between the water-sediment interface is the important factors influencing the sediment release(absorption)state,the concentration difference,the greater the water-sediment interface between pollutant migration the faster the transformation.4.Through the comprehensive experiment analysis of dissolved oxygen,temperature for the effects of pollutants in sediment release regularity,the experimental results show that the sediment of total nitrogen,total phosphorus,ammonia nitrogen,nitrate nitrogen and the release of the COD and positive linear correlation between the changes of temperature,and the relationship between dissolved oxygen.The value of the total nitrogen and nitrate nitrogen and dissolved oxygen into positive linear correlation,and the ammonia nitrogen,total phosphorus and COD content and dissolved oxygen into negatively linear correlation.And sediments of dissolved oxygen for most monitoring total nitrogen,ammonia nitrogen,nitrate nitrogen,total phosphorus and COD release effect is significant.