Analysis On Water Quality Change In Wu Qiangxi Reservoir

In recent twenty years,the fast development of economy and enlargement of human activity scope have notably influenced water quality in Wu Qiangxi Reservoir.The first step to solve the problems of water environment is to judge the trend of water quality change and identify the influencing factors of water quality scientifically.Based on the water quality monitoring data of Wu Qiangxi Reservoir from the year of 2010 to 2016,the single factor evaluation method is used to analyze the change trend of water quality,and the influencing factors of water quality are discussed from both natural and human activities,and the contribution of natural factors is quantified by gray correlative degree method.The results show that:The main pollutants such as total phosphorus,CODcr,fecal coliform concentration decreased,the total nitrogen exceeded the standard and the concentration increased.The total nitrogen and fecal coliform concentration change little,and CODcr concentration fluctuates strongly during the year.Water temperature and precipitation have a strong correlation with water quality,and the correlation is between 0.60 and 0.80.The correlation between water temperature and total nitrogen concentration is higher,and precipitation makes a greater contribution to total phosphorus,CODcr and fecal coliform concentration,and the correlations are0.690,0.72,0.73 and 0.74 respectively.The population quantity,the level of industrial development and pollutant discharge are considered the main human activities factors.