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The influence of water conservancy project on microplastics distribution in river ecosystem: A case study of Lhasa River Basin in Qinghai-Tibet Plateau

Journal of Hazardous Materials 2024 7 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Xiaoning Liu, Dan Wang, Xiaoning Liu, Xiaoning Liu, Xiaoning Liu, Dan Wang, Xiaoning Liu, Xiaoning Liu, Wangwang Li, Le Zhang, Xiaoning Liu, Xiaoning Liu, Xiaoning Liu, Xiaoning Liu, Xiaoning Liu, Wangwang Li, Xiaoning Liu, Wangwang Li, Xiaoning Liu, Zhaowei Zhang Wangwang Li, Xiaoning Liu, Xiaoning Liu, Xiaoning Liu, Xiaoning Liu, Xiaoning Liu, Xiaoning Liu, Chang Meng, Zhaowei Zhang Zhaowei Zhang Zhaowei Zhang Xiaoning Liu, Xiaoning Liu, Zhaowei Zhang, Zhi‐Quan Tian, Zhaowei Zhang Zhi‐Quan Tian, Xiaoning Liu, Zhaowei Zhang Zhi‐Quan Tian, Zhi‐Quan Tian, Xiaoning Liu, Zhaowei Zhang Zhaowei Zhang Zhaowei Zhang

Summary

Microplastic concentrations in the Lhasa River Basin decreased from upstream to downstream as reservoirs acted as sinks, with the barrier effect of dams increasing MP deposition in sediments and reducing surface water concentrations in the Qinghai-Tibet Plateau.

Study Type Environmental

Water conservancy projects affect the migration, suspension, and deposition of microplastic (MP). However, its impact on MP pollution of river ecosystem remains elusive. Herein, we investigated the MP characteristics and the influence of water conservancy projects on MPs in the Lhasa River Basin of the Qinghai-Tibet Plateau, China. The results demonstrated that the MPs concentration in surface water decreased from upstream to downstream, as more MPs in surface water were settling down and stored in reservoir sediments in the midstream. It is postulated that reservoir sedimentation of MPs occurs at a greater rate due to the barrier effect of reservoirs, steady hydrodynamics, and weak salinity-induced buoyancy. To evaluate the ecological risk of the Lhasa River Basin, the pollution load index, the polymer hazard index, and the potential ecological risk index were analyzed. The upstream exhibits elevated polymer hazard index values (>100), and the potential ecological risk index values in the Lhasa River Basin showed ecological risk similar to those of pollution load index values. This research represents the initial exploration of MP distribution within the entire Lhasa River basin, providing a foundational framework for investigating the impact of water conservancy projects on MP migration.

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