Student Research Reports

View Research Report

Research Project Title A Comparison of Long-Term Trends in the Physicochemical Water Quality of the Ping River in Chiang Mai Province Authors Chanyanuch Jeerapong Arinchaya Sukin Kamonlax Jaiya Pattarawadee Thongngoen Wachira Chiwaskulyong Curriculum: Water Quality, Ping River, Physicochemical Parameters, Temporal Changes, Water Quality Index (WQI) Year: 2026 The water quality of the Ping River has changed over time and has been influenced by natural factors in combination with human activities. This study aimed to compare long term trends in the physicochemical water quality of the Ping River in Chiang Mai Province using monitoring data collected under the GLOBE Program in 2007 and during the period 2019–2023. The parameters examined included water temperature, electrical conductivity, water transparency, and dissolved oxygen, together with an assessment of the Water Quality Index (WQI) The results indicated that these parameters exhibited clear seasonal and spatial variations, particularly in urban areas where conductivity showed an increasing trend and water transparency declined. Meanwhile, the Water Quality Index in several locations tended to decrease to degraded levels when the two study periods were compared. The findings reflect pressures from urban expansion and land-use change on the river ecosystem and provide baseline information for water restoration planning, pollution control policy development, and sustainable long-term water-quality monitoring. Keywords Water Quality Ping River Physicochemical Water Quality Temporal Changes