Study on the variation of Total phosphorus and its influencing factors in Shenzhen Estuary
Under the goal of continuous improvement of water ecological environment in the"14th Five-Year Plan",the target of national assessment section was determined differently.Total Phosphorus(TP)became the key factor restricting the Shenzhen Estuary to reach the assessment target.Based on rainfall and water quality data of Shenzhen Estuary from 2021 to 2022,Pearson correlation analysis method and multiple linear regression analysis were used to analyze the influence of different environmental factors on TP changes,and the change rule of TP under different rainfall events was explored.The results showed that TP was positively correlated with water temperature,turbidity,ammonia nitrogen,permanganate index and rainfall,and negatively correlated with dissolved oxygen and electrical conductivity.In light rain,moderate rain and heavy rain,the total phosphorus increased by 13.1%,40.8% and 47.4%,respectively,compared with that in clear rain,indicating that the runoff from rainfall carried total phosphorus into the Shenzhen Estuary,and the effect was much greater than the dilution effect.After the occurrence of single rainfall with different intensity,the TP concentration increased significantly on the second day of moderate rain and above intensity.On the third day of moderate rain intensity,the TP concentration could basically return to the pre-rain level,and it takes about 7 days for the total phosphorus concentration to fall to the pre-rain level under heavy rain,rainstorm and above intensity.
Total Phosphorusrainfallturbiditysedimentcorrelation analysis
万方数据
维普
