Dynamics And Influence Analysis Of Water Quality In Xintai Section Of Chaiwen River During Recent Ten Years

In recent years,China’s economy has developed rapidly and its economic strength has become stronger and stronger.However,the imbalance between social development and resource utilization has become increasingly serious.From the perspective of water resources,although the total amount of water resources in China is large,the population base is large and the number is large,so the per capita use of water resources is small,which is only 1/4 of the world’s per capita share.At the cost of sacrificing the environment,the pursuit of maximum economic benefits,resulting in waste of resources,which exacerbates the current situation of water shortage in China.Surface water environment is closely related to people’s life,and its water quality changes directly affect people’s health.Xintai City,located in the central part of Shandong Province,is a warm temperate continental monsoon climate.It has hot summer and heavy rainfall.It is cold and dry in winter,and freshwater resources are relatively scarce.Chai Wen River passes through Xintai City and flows through Dongzhou Reservoir,the largest reservoir in Xintai City.The water stored in the Chaiwen River can provide Xintai with a certain amount of fresh water resources and alleviate the contradiction between the needs of urban development and the lack of water resources.Therefore,the study of water quality changes in Chaiwen River has an important impact on the economic development and human health of Xintai.In order to understand the change of water quality in the Chaiwen River from 2007 to2016 and the influence of human activities on the water quality of the Chaiwen River in the Xintai Section,eight monitoring indexes were selected,including COD_cr,BOD₅,COD_Mn,F^-,NH₃-N,T-N,T-P and fecal coliform bacteria.Sha Po Bridge,Gu Li Bridge and Nan Song Bridge were selected as monitoring sections in order to understand the water quality changes of Chaiwen River in different areas in Xintai City.According to the national standard GB3838-2002,V water quality was evaluated by single factor index method,and the highest category of monitoring items was regarded as the water quality grade.By calculating the annual average content and single factor pollution index of each index,it is concluded that the water quality of Sha Po Bridge,Gu Li Bridge and Nan Song Bridge from 2007 to 2016belongs to inferior V category,and the water quality is seriously polluted,and the river water use capacity is relatively poor.It is found that in different periods,at the same location of Chaiwen River,the size of monitoring indicators shows certain regularity.For example,the content of ammonia nitrogen and total phosphorus T-P in the same monitoring section in summer is generally lower than that in winter.Moreover,in the same period,the change of water quality in different locations of the Chai Wen River is also different.In the same period,the Shapo Bridge has the best water quality,followed by the Southern Song Bridge,and the Guli Bridge has the worst water quality.The water quality of Chaiwen River in Xintai section belongs to inferior V-type water and is seriously polluted.In order to ensure the safety of water use in Xintai City,active measures should be taken to control the content of organic matter in water and improve the quality of water resources in Chaiwen River.