| Abstract |
| This study quantitatively evaluated the impact of wintertime cloud seeding experiments conducted at the Cloud Physics Observation Center (CPOS) in Pyeongchang, Korea, on downstream water quality. Long-term monitoring data (March, 1997-2024) from Odaecheon-1, located within the seeding impact zone, and Bukcheon, outside the affected area, were compared. Key parameters included total nitrogen (TN), total phosphorus (TP), and chlorophyll-a (Chl-a), along with supplementary indicators such as water temperature, dissolved oxygen (DO), pH, and electrical conductivity (EC). Time-series analysis revealed statistically significant trends of increasing temperature and decreasing DO at Odaecheon-1 (p < 0.01), while EC exhibited significant increases at both sites. Notably, chlorophyll-a at Odaecheon-1 showed a rising trend of approximately +0.13 mg/m³/yr (p = 0.072), suggesting a gradual enhancement of algal growth conditions. Pearson correlation analysis indicated that Bukcheon exhibited multiple significant correlations (e.g., temperature-Chl-a, TN-Chl-a, SS-EC), whereas only temperature-DO and TN-EC correlations were significant at Odaecheon-1. These findings suggest that Bukcheon maintains a stable, nature-driven water quality regime, while Odaecheon-1 responds more sensitively to external influences such as cloud seeding. The results provide essential scientific evidence for assessing the environmental effects of artificial precipitation and for developing ecosystem-based water resource management strategies. |
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| Key Words |
| 북천, 인공증설, 영양염류-조류, 오대천1, 하천수질, Bukcheon, Cloud Seeding, Nutrient-Algae, Odaecheon-1, Stream Water Quality |
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