Presenter
Ms. Chenxi LI, Nanjing Research Institute of Hydrology and Water Conservation Automation, Ministry of Water Resources
Co-author(s)
Mr. Hezhen YANG, School of Energy and Environmental Engineering, Hebei Engineering University
Mr. Siyu SUN, Beijing North Canal Management Office
Mr. Yuzhu SHI, College of Environment, Liaoning University
Mr. Wenhui LIU, Taizhou Jiaojiang Ecological Zone Construction Affairs Center
Mr. Guowen LI, School of Energy and Environmental Engineering, Hebei Engineering University
Mr. Cao LIU, School of Energy and Environmental Engineering, Hebei Engineering University
Sub-theme
4. Supporting Aquatic Ecosystem Health and Functions
Topic
4-8. Water quality improvement
Body
Anastomosing rivers are mostly found in industrialized and densely populated areas in China, playing a crucial role in fields of water supply, irrigation, transportation, recreation and aquatic ecosystem protection. Many fixed-point systems have been established nationwide to enable long-term and reliable water quality monitoring and have generated profound datasets. However, the fact that anastomosing rivers intertwine in tortuous flow directions and are regulated with numerous structures poses considerable difficulties in exploring them. As a result, scientific references are relatively rare for environmental protection authorities to systematically assess these rivers’ pollution situation. This paper aims to identify the temporal and spacial distribution patterns of anastomosing rivers and disclose contributions of pollution sources to these rivers. Taking the Jiaojiang River in a case study, the paper analyzes major water quality parameters and explores potential pollution sources of anastomosing rivers. Through the principal component analysis (PCA) and correlation analysis, five essential parameters: CODMn, DO, NH3-N, TP and FL were selected to reflect water quality situation of the Jiaojiang River. According to datasets from 2016 to 2020, evaluation has been carried out using the water quality index (WQI) method. In the Jiaonan catchment, the most polluted of the Jiaojiang River, the APCS-MLR model and PMF model were used to analyze water quality parameters at significantly vulnerable locations. Four potential pollution sources and their contributions were identified. Measured with APCS-MLR model, domestic sewage accounts for 28.83%, surface runoff 20.42%, industrial wastewater 16.49% and agricultural non-point sources 8.98%. Measured with PMF model, domestic sewage accounts for 39.24%, surface runoff 26.49%, industrial wastewater 19.22%, and agricultural non-point sources 15.04%. Source tracing results of the two models are consistent, which proves the accuracy of both. Findings in the paper provide a scientific support in formulating water quality management and pollution control measures for the Jiaojiang River as well as theoretical and technical reference for further study on anastomosing rivers.