Cross-wavelets Analysis of Dissolved Oxygen Changes and Its Key Influencing Factors
Dissolved oxygen is an important indicator of river ecosystems and pollution,and it is of great significance to monitor river dissolved oxygen and analyze its changes.Currently,rivers around the world are seriously polluted and hypoxia is a frequent problem,which seriously affects the ecological status of rivers.In order to reveal the changing char-acteristics of dissolved oxygen and its influencing factors,and to explain the causes of hypoxia,7 468 sets of water quality data from the state-controlled stations under Ma'an bridge were collected from January 2020 to July 2023,and analyzed u-sing wavelet analysis,Spearman correlation analysis and multiple linear regression.The results show that the dissolved oxygen concentration at the state-controlled site showed cyclic changes,while the change trend was seasonal,and there was a consistent daily trend;The changes in all time scales were affected by a variety of factors,and pH and temperature were the primary factors for the fluctuation of dissolved oxygen;It was also affected by the nutrient salts of ammonia ni-trogen and nitrogen phosphorus in the seasonal scale;The nutrient salts from precipitation and bottom mud upwelling were the primary factors in the hypoxia problem.
万方数据
维普
