Spatial and Temporal Variation of River Water Quality in Yandu District of China

To achieve a holistic assessment of the water quality dynamics within the principal riverine systems of Yandu District, this study employed a comprehensive analysis of the Water Quality Index (WQI) derived from the monthly monitoring data collected at fifteen designated water quality monitoring stations across the main rivers from 2020 to 2022. The following results were obtained: Firstly, the annual average value of WQI during 2020-2022 was 58.14, and the water quality of Yandu District was considered as generally"moderate". Secondly, the WQI values in non-flood season were better than those in flood season and the WQI values in the northeast rivers were lower than other rivers. Thirdly, the main factors affecting water quality were NH3-N, TP, CODMn and DO. Therefore, it is necessary to strengthen the monitoring of water quality during the flood season and prioritize the treatment of the northern rivers in the Yandu District. The findings of this research could offer valuable insights for the evaluation, conservation, and management of water quality within analogous riverine systems, thereby contributing to the broader field of aquatic environmental science.