基于交叉小波的河流溶解氧变化特征及其关键影响因子  

Cross-wavelets Analysis of Dissolved Oxygen Changes and Its Key Influencing Factors

作　　者：梁紫婷 李清雪 王博宇 孙健[2] LIANG Zi-ting;LI Qing-xue;WANG Bo-yu;SUN Jian(School of Energy and Environmental Engineering,Hebei University of Engineering,Handan 056038,China;State Key Laboratory of Water Science and Engineering,Department of Water Conservancy Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]河北工程大学能源与环境工程学院,河北邯郸056038 [2]清华大学水利工程系水利科学与工程国家重点实验室,北京100084

出　　处：《水电能源科学》2024年第12期59-63,共5页Water Resources and Power

摘　　要：溶解氧是衡量河流健康和污染程度的重要指标,监测河流溶解氧并分析其变化具有重要意义。当前世界范围内河流污染严重,低氧问题频发,严重影响河流生态状况。为揭示河流溶解氧变化特征及其影响因素并解释低氧成因,以西枝江为研究对象,收集了2020年1月~2023年7月马安大桥下国控站点的7468组水质数据,利用交叉小波分析和多元线性回归对其进行分析。结果表明,该国控站点溶解氧浓度呈周期变化,变化趋势为季节性,并存在一致的日变化趋势;各时间尺度的变化受到多种因素作用,其中pH值和温度是溶解氧波动的首要因素,而在季节尺度还受到氨氮的影响;降水带来的营养盐和底泥上浮是低氧问题的首要因素。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,7468 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.

关 键 词：溶解氧 小波变换 影响因素 季节变化 交叉小波 

分 类 号：X522[环境科学与工程—环境工程]